Merge "Add Nested JSON Filtering"

7 files changed, 349 insertions, 829 deletions

diff --git a/policy-management/pom.xml b/policy-management/pom.xml
index 81edf7a0..d48d3ffb 100644
--- a/policy-management/pom.xml
+++ b/policy-management/pom.xml
@@ -241,6 +241,11 @@
             <artifactId>gson-javatime-serialisers</artifactId>
             <version>1.1.1</version>
         </dependency>
+        
+        <dependency>
+            <groupId>com.jayway.jsonpath</groupId>
+            <artifactId>json-path</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>org.apache.commons</groupId>
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerFactory.java b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerFactory.java
index 24fc6de9..16daa947 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerFactory.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerFactory.java
@@ -7,9 +7,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -25,7 +25,6 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Properties;
-
 import org.onap.policy.common.endpoints.event.comm.Topic;
 import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
 import org.onap.policy.common.endpoints.event.comm.TopicSink;
@@ -38,7 +37,6 @@ import org.onap.policy.drools.protocol.coders.JsonProtocolFilter;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration.CustomGsonCoder;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration.PotentialCoderFilter;
-import org.onap.policy.drools.utils.Pair;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -50,11 +48,11 @@ public interface DroolsControllerFactory {
 
     /**
      * Constructs a Drools Controller based on properties.
-     * 
+     *
      * @param properties properties containing initialization parameters
      * @param eventSources list of event sources
      * @param eventSinks list of event sinks
-     * 
+     *
      * @return the instantiated Drools Controller
      * @throws IllegalArgumentException with invalid parameters
      * @throws LinkageError Failure to link rules and models in Drools Libraries
@@ -64,13 +62,13 @@ public interface DroolsControllerFactory {
 
     /**
      * Explicit construction of a Drools Controller.
-     * 
+     *
      * @param groupId maven group id of drools artifact
      * @param artifactId maven artifact id of drools artifact
      * @param version maven version id of drools artifact
      * @param decoderConfigurations list of decoder configurations
      * @param encoderConfigurations list of encoder configurations
-     * 
+     *
      * @return the instantiated Drools Controller
      * @throws IllegalArgumentException with invalid parameters
      * @throws LinkageError Failure to link rules and models in Drools Libraries
@@ -81,7 +79,7 @@ public interface DroolsControllerFactory {
 
     /**
      * Releases the Drools Controller from operation.
-     * 
+     *
      * @param controller the Drools Controller to shut down
      */
     public void shutdown(DroolsController controller);
@@ -93,7 +91,7 @@ public interface DroolsControllerFactory {
 
     /**
      * Destroys and releases resources for a Drools Controller.
-     * 
+     *
      * @param controller the Drools Controller to destroy
      */
     public void destroy(DroolsController controller);
@@ -105,11 +103,11 @@ public interface DroolsControllerFactory {
 
     /**
      * Gets the Drools Controller associated with the maven group and artifact id.
-     * 
+     *
      * @param groupId maven group id of drools artifact
      * @param artifactId maven artifact id of drools artifact
      * @param version maven version id of drools artifact
-     * 
+     *
      * @return the Drools Controller
      * @throws IllegalArgumentException with invalid parameters
      */
@@ -117,7 +115,7 @@ public interface DroolsControllerFactory {
 
     /**
      * returns the current inventory of Drools Controllers.
-     * 
+     *
      * @return a list of Drools Controllers
      */
     public List<DroolsController> inventory();
@@ -208,7 +206,7 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
             /*
              * The Null Drools Controller for no maven coordinates is always here so when no
              * coordinates present, this is the return point
-             * 
+             *
              * assert (controllerCopy instanceof NullDroolsController)
              */
             if (droolsControllers.containsKey(controllerId)) {
@@ -245,7 +243,7 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
 
     /**
      * find out decoder classes and filters.
-     * 
+     *
      * @param properties properties with information about decoders
      * @param topicEntities topic sources
      * @return list of topics, each with associated decoder classes, each with a list of associated
@@ -313,7 +311,7 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
             // 3. second the list of classes associated with each topic
 
             String eventClasses = properties
-                    .getProperty(propertyTopicEntityPrefix + firstTopic 
+                    .getProperty(propertyTopicEntityPrefix + firstTopic
                             + PolicyEndPointProperties.PROPERTY_TOPIC_EVENTS_SUFFIX);
 
             if (eventClasses == null || eventClasses.isEmpty()) {
@@ -328,54 +326,14 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
             for (String theClass : topicClasses) {
 
 
-                // 4. third, for each coder class, get the list of field filters
+                // 4. third, for each coder class, get the filter expression
 
                 String filter = properties
-                        .getProperty(propertyTopicEntityPrefix + firstTopic 
+                        .getProperty(propertyTopicEntityPrefix + firstTopic
                                 + PolicyEndPointProperties.PROPERTY_TOPIC_EVENTS_SUFFIX
                                 + "." + theClass + PolicyEndPointProperties.PROPERTY_TOPIC_EVENTS_FILTER_SUFFIX);
 
-                List<Pair<String, String>> filters = new ArrayList<>();
-
-                if (filter == null || filter.isEmpty()) {
-                    // 4. topic -> class -> with no filters
-
-                    JsonProtocolFilter protocolFilter = JsonProtocolFilter.fromRawFilters(filters);
-                    PotentialCoderFilter class2Filters = new PotentialCoderFilter(theClass, protocolFilter);
-                    classes2Filters.add(class2Filters);
-                    continue;
-                }
-
-                // There are filters associated with the applicability of
-                // this class for decoding.
-                List<String> listOfFilters = new ArrayList<>(Arrays.asList(filter.split("\\s*,\\s*")));
-
-                for (String nameValue : listOfFilters) {
-                    String fieldName;
-                    String regexValue;
-
-                    String[] nameValueSplit = nameValue.split("\\s*=\\s*");
-                    if (nameValueSplit.length <= 0 || nameValueSplit.length > 2) {
-                        // TODO warn
-                        // skip
-                        continue;
-                    }
-
-                    if (nameValueSplit.length == 2) {
-                        fieldName = nameValueSplit[0];
-                        regexValue = nameValueSplit[1];
-                    } else if (nameValueSplit.length == 1) {
-                        fieldName = nameValueSplit[0];
-                        regexValue = null;
-                    } else {
-                        // unreachable
-                        continue;
-                    }
-
-                    filters.add(new Pair<String, String>(fieldName, regexValue));
-                }
-
-                JsonProtocolFilter protocolFilter = JsonProtocolFilter.fromRawFilters(filters);
+                JsonProtocolFilter protocolFilter = new JsonProtocolFilter(filter);
                 PotentialCoderFilter class2Filters = new PotentialCoderFilter(theClass, protocolFilter);
                 classes2Filters.add(class2Filters);
             }
@@ -408,7 +366,7 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
 
     /**
      * unmanage the drools controller.
-     * 
+     *
      * @param controller the controller
      */
     protected void unmanage(DroolsController controller) {
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilter.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilter.java
index f65efaed..2ccc010f 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilter.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilter.java
@@ -2,14 +2,14 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -20,378 +20,120 @@
 
 package org.onap.policy.drools.protocol.coders;
 
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonParser;
+import com.jayway.jsonpath.Configuration;
+import com.jayway.jsonpath.DocumentContext;
+import com.jayway.jsonpath.JsonPath;
+import com.jayway.jsonpath.Option;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.CopyOnWriteArrayList;
-import org.onap.policy.drools.utils.Pair;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- * JSON Protocol Filter.
- */
+/** JSON Protocol Filter. */
 public class JsonProtocolFilter {
 
-    private static final String MISSING_RULE_NAME = "no rule name provided";
-    /**
-     * Logger.
-     */
-    private static final Logger logger = LoggerFactory.getLogger(JsonProtocolFilter.class);
-
-    /**
-     * Helper class to collect Filter information.
-     */
-    public static class FilterRule {
-        /**
-         * Field name.
-         */
-        private String name;
-
-        /**
-         * Field Value regex.
-         */
-        private String regex;
-
-        /**
-         * Filter Constructor.
-         * 
-         * @param name field name
-         * @param regex field regex value
-         */
-        public FilterRule(String name, String regex) {
-            this.setName(name);
-            this.setRegex(regex);
-        }
-
-        /**
-         * Default constructor (for serialization only).
-         */
-        public FilterRule() {
-            super();
-        }
-
-        /**
-         * gets name.
-         * 
-         * @return name
-         */
-        public String getName() {
-            return name;
-        }
-
-        /**
-         * gets regex.
-         * 
-         * @return regular expression string
-         */
-        public String getRegex() {
-            return regex;
-        }
-
-        /**
-         * Sets field name.
-         * 
-         * @param name field name
-         */
-        public void setName(String name) {
-            if (name == null || name.isEmpty()) {
-                throw new IllegalArgumentException("filter field name must be provided");
-            }
-
-            this.name = name;
-        }
-
-        /**
-         * sets regex name.
-         * 
-         * @param regex expression
-         */
-        public void setRegex(String regex) {
-            if (regex == null || regex.isEmpty()) {
-                this.regex = ".*";
-            }
-
-            this.regex = regex;
-        }
+    /** Default filter to match anything. */
+    public static final String MATCH_ANY = "[?($ =~ /.*/)]";
 
-        @Override
-        public String toString() {
-            StringBuilder builder = new StringBuilder();
-            builder.append("Filter [name=").append(name).append(", regex=").append(regex).append("]");
-            return builder.toString();
-        }
-    }
+    /** Logger. */
+    private static final Logger logger = LoggerFactory.getLogger(JsonProtocolFilter.class);
 
-    /**
-     * all the filters to be applied.
-     */
-    protected List<FilterRule> rules = new CopyOnWriteArrayList<>();
+    /** A rule based on a JsonPath expression that is used for filtering. */
+    private String rule;
 
     /**
-     * Create a Protocol Filter.
-     * 
-     * @throws IllegalArgumentException an invalid input has been provided
+     * Default constructor (for serialization only).
      */
     public JsonProtocolFilter() {
         super();
+        this.setRule(null);
     }
 
     /**
      * Constructor.
-     * 
-     * @param filters filter list
-     * 
-     * @throws IllegalArgumentException an invalid input has been provided
-     */
-    public JsonProtocolFilter(List<FilterRule> filters) {
-        List<FilterRule> temp = new ArrayList<>();
-        for (FilterRule rule : filters) {
-            if (rule.getName() == null || rule.getName().isEmpty()) {
-                continue;
-            }
-
-            if (rule.getRegex() == null || rule.getRegex().isEmpty()) {
-                rule.setRegex(".*");
-            }
-
-            temp.add(rule);
-        }
-
-        this.rules.addAll(temp);
-    }
-
-    /**
-     * From raw filters.
-     * 
-     * @param rawFilters raw filter initialization
-     * 
+     *
+     * @param rule the JsonPath expression used for the filter rule
      * @throws IllegalArgumentException an invalid input has been provided
      */
-    public static JsonProtocolFilter fromRawFilters(List<Pair<String, String>> rawFilters) {
-
-        if (rawFilters == null) {
-            throw new IllegalArgumentException("No raw filters provided");
-        }
-
-        List<FilterRule> filters = new ArrayList<>();
-        for (Pair<String, String> filterPair: rawFilters) {
-            if  (filterPair.first() == null || filterPair.first().isEmpty()) {
-                continue;
-            }
-
-            filters.add(new FilterRule(filterPair.first(), filterPair.second()));
-        }
-        return new JsonProtocolFilter(filters);
+    public JsonProtocolFilter(String rule) {
+        this.setRule(rule);
     }
 
     /**
-     * are there any filters.
-     * 
-     * @return true if there are filters, false otherwise
+     * Gets the filter expression rule.
+     *
+     * @return the filter expression associated with this JsonProtocolFilter
      */
-    public boolean isRules() {
-        return !this.rules.isEmpty();
+    public String getRule() {
+        return this.rule;
     }
 
     /**
-     * accept a JSON string as conformant it if passes all filters.
-     * 
-     * @param json json is a JSON object
-     * @return true if json string is conformant
-     * 
-     * @throws IllegalArgumentException an invalid input has been provided
+     * Sets the filter expression rule.
+     *
+     * @param rule the JsonPath expression rule
      */
-    public boolean accept(JsonElement json) {
-        if (json == null) {
-            throw new IllegalArgumentException("no JSON provided");
-        }
-
-        if (!json.isJsonObject()) {
-            return false;
-        }
-
-        if (rules.isEmpty()) {
-            return true;
-        }
-
-        try {
-            JsonObject event = json.getAsJsonObject();
-            for (FilterRule filter: rules) {
-                if (filter.getRegex() == null
-                        || filter.getRegex().isEmpty()
-                        || ".*".equals(filter.getRegex())) {
-
-                    // Only check for presence
-                    if (!event.has(filter.getName())) {
-                        return false;
-                    }
-                } else {
-                    JsonElement field = event.get(filter.getName());
-                    if (field == null) {
-                        return false;
-                    }
-
-                    String fieldValue = field.getAsString();
-                    if (!fieldValue.matches(filter.getRegex())) {
-                        return false;
-                    }
-                }
-            }
-            return true;
-        } catch (Exception e) {
-            throw new IllegalArgumentException(e);
+    public void setRule(String rule) {
+        String ruleExpression = rule;
+        if (rule == null || rule.isEmpty()) {
+            ruleExpression = MATCH_ANY;
         }
+        this.rule = ruleExpression;
     }
 
     /**
-     * Accept a JSON string as conformant it if passes all filters.
-     * 
-     * @param json json string
-     * @return true if json string is conformant
-     * 
-     * @throws IllegalArgumentException an invalid input has been provided
+     * Accepts a JSON message if there is a match on the filter expression.
+     *
+     * @return true if a match is found or the rule uses the match any policy, false otherwise
      */
     public boolean accept(String json) {
-        if (json == null || json.isEmpty()) {
-            throw new IllegalArgumentException("no JSON provided");
-        }
-
-        if (rules.isEmpty()) {
+        if (MATCH_ANY.equals(this.rule)) {
             return true;
         }
-
-        try {
-            JsonElement element = new JsonParser().parse(json);
-            if (element == null || !element.isJsonObject()) {
-                return false;
-            }
-
-            return this.accept(element.getAsJsonObject());
-        } catch (IllegalArgumentException ile) {
-            throw ile;
-        } catch (Exception e) {
-            logger.info("{}: cannot accept {} because of {}", 
-                    this, json, e.getMessage(), e);
-            throw new IllegalArgumentException(e);
-        }
-    }
-
-    public List<FilterRule> getRules() {
-        return new ArrayList<>(this.rules);
+        return !filter(json).isEmpty();
     }
 
     /**
-     * Get rules.
-     * 
-     * @param name name
-     * @return list of filter rules
+     * Finds a field based on a path or a subset of the JSON if using an expression.
+     *
+     * @param json the JSON string to be parsed
+     * @return a list of strings that match the expression
      */
-    public List<FilterRule> getRules(String name) {
-        if (name == null || name.isEmpty()) {
-            throw new IllegalArgumentException(MISSING_RULE_NAME);
-        }
-
-        ArrayList<FilterRule> temp = new ArrayList<>();
-        for (FilterRule rule : this.rules) {
-            if (rule.getName().equals(name)) {
-                temp.add(rule);
-            }
-        }
-        return temp;
+    public List<String> filter(String json) {
+        return filter(json, this.rule);
     }
 
     /**
-     * Set Rules.
-     * 
-     * @param rulesFilters filters
+     * Finds all occurrences of a field in a JSON document based on the JsonPath
+     * expression.
+     *
+     * @param json the JSON string to be parsed
+     * @param expression the JsonPath expression
+     * @return a list of matches from the JSON document
      */
-    public void setRules(List<FilterRule> rulesFilters) {
-        if (rulesFilters == null) {
-            throw new IllegalArgumentException("no rules provided");
-        }
-
-        this.rules.clear();
-        this.rules.addAll(rulesFilters);
-    }
-
-    /**
-     * Delete rules.
-     * 
-     * @param name name
-     */
-    public void deleteRules(String name) {
-        if (name == null || name.isEmpty()) {
-            throw new IllegalArgumentException(MISSING_RULE_NAME);
-        }
-
-        List<FilterRule> temp = new ArrayList<>();
-        for (FilterRule rule : this.rules) {
-            if (rule.name.equals(name)) {
-                temp.add(rule);
-            }
-        }
-        this.rules.removeAll(temp);
-    }
-
-    /**
-     * Delete rule.
-     * 
-     * @param name name
-     * @param regex regex
-     */
-    public void deleteRule(String name, String regex) {
-        if (name == null || name.isEmpty()) {
-            throw new IllegalArgumentException(MISSING_RULE_NAME);
-        }
-
-        String nonNullRegex = regex;
-        if (regex == null || regex.isEmpty()) {
-            nonNullRegex = ".*";
+    public static List<String> filter(String json, String expression) {
+        if (json == null || json.isEmpty()) {
+            throw new IllegalArgumentException("a json string must be provided");
         }
 
-        List<FilterRule> temp = new ArrayList<>();
-        for (FilterRule rule : this.rules) {
-            if (rule.name.equals(name) && rule.getRegex().equals(nonNullRegex)) {
-                temp.add(rule);
-            }
+        if (expression == null || expression.isEmpty()) {
+            throw new IllegalArgumentException("an expression must be provided");
         }
 
-        this.rules.removeAll(temp);
-    }
-
-    /**
-     * Add rule.
-     * 
-     * @param name name
-     * @param regex regex
-     */
-    public void addRule(String name, String regex) {
-        if (name == null || name.isEmpty()) {
-            throw new IllegalArgumentException(MISSING_RULE_NAME);
-        }
+        Configuration conf = Configuration.defaultConfiguration().addOptions(Option.ALWAYS_RETURN_LIST);
+        DocumentContext document = JsonPath.using(conf).parse(json);
 
-        String nonNullRegex = regex;
-        if (regex == null || regex.isEmpty()) {
-            nonNullRegex = ".*";
+        List<String> matches = new ArrayList<>();
+        try {
+            matches = document.read(expression);
+        } catch (Exception e) {
+            logger.error("JsonPath couldn't read {} because of {}", expression, e.getMessage(), e);
         }
 
-        for (FilterRule rule : this.rules) {
-            if (rule.getName().equals(name) && rule.getRegex().equals(regex)) {
-                return;
-            }
+        if (matches.isEmpty()) {
+            logger.warn("Could not find any matches for rule {} in json {}", expression, json);
         }
 
-        this.rules.add(new FilterRule(name, nonNullRegex));
+        return matches;
     }
-
-    @Override
-    public String toString() {
-        StringBuilder builder = new StringBuilder();
-        builder.append("JsonProtocolFilter [rules=").append(rules).append("]");
-        return builder.toString();
-    }
-
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolset.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolset.java
index f125c134..394e73af 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolset.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolset.java
@@ -31,7 +31,6 @@ import com.google.gson.JsonParser;
 import com.google.gson.JsonPrimitive;
 import com.google.gson.JsonSerializationContext;
 import com.google.gson.JsonSerializer;
-
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Type;
@@ -168,7 +167,7 @@ public abstract class ProtocolCoderToolset {
 
     /**
      * remove coder.
-     * 
+     *
      * @param eventClass event class
      */
     public void removeCoders(String eventClass) {
@@ -206,7 +205,7 @@ public abstract class ProtocolCoderToolset {
 
     /**
      * Get group id.
-     * 
+     *
      * @return the groupId
      */
     public String getGroupId() {
@@ -215,7 +214,7 @@ public abstract class ProtocolCoderToolset {
 
     /**
      * Get artifact id.
-     * 
+     *
      * @return the artifactId
      */
     public String getArtifactId() {
@@ -224,7 +223,7 @@ public abstract class ProtocolCoderToolset {
 
     /**
      * Get custom coder.
-     * 
+     *
      * @return the customCoder
      */
     public CustomCoder getCustomCoder() {
@@ -233,7 +232,7 @@ public abstract class ProtocolCoderToolset {
 
     /**
      * Set custom coder.
-     * 
+     *
      * @param customCoder the customCoder to set.
      */
     public void setCustomCoder(CustomCoder customCoder) {
@@ -262,28 +261,14 @@ public abstract class ProtocolCoderToolset {
             throw new IllegalStateException("No coders available");
         }
 
-        if (this.coders.size() == 1) {
-            final JsonProtocolFilter filter = this.coders.get(0).getFilter();
-            if (!filter.isRules()) {
-                return this.coders.get(0);
-            }
-        }
-
-        JsonElement event;
-        try {
-            event = this.filteringParser.parse(json);
-        } catch (final Exception e) {
-            throw new UnsupportedOperationException(e);
-        }
-
         for (final CoderFilters decoder : this.coders) {
             try {
-                final boolean accepted = decoder.getFilter().accept(event);
+                boolean accepted = decoder.getFilter().accept(json);
                 if (accepted) {
                     return decoder;
                 }
             } catch (final Exception e) {
-                logger.info("{}: unexpected failure accepting {} because of {}", this, event,
+                logger.info("{}: unexpected failure accepting {} because of {}", this, json,
                         e.getMessage(), e);
                 // continue
             }
@@ -325,8 +310,6 @@ public abstract class ProtocolCoderToolset {
     }
 }
 
-
-
 /**
  * Tools used for encoding/decoding using GSON.
  */
diff --git a/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java b/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
index 64fd6823..cbe2b339 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * policy-management
  * ================================================================================
- * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,8 +36,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 import java.util.UUID;
-import java.util.regex.Pattern;
-
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.DefaultValue;
@@ -51,7 +49,6 @@ import javax.ws.rs.QueryParam;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.Status;
-
 import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
 import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.common.endpoints.event.comm.TopicSource;
@@ -67,7 +64,6 @@ import org.onap.policy.drools.properties.DroolsProperties;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder.CoderFilters;
 import org.onap.policy.drools.protocol.coders.JsonProtocolFilter;
-import org.onap.policy.drools.protocol.coders.JsonProtocolFilter.FilterRule;
 import org.onap.policy.drools.protocol.coders.ProtocolCoderToolset;
 import org.onap.policy.drools.protocol.configuration.ControllerConfiguration;
 import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
@@ -77,7 +73,6 @@ import org.onap.policy.drools.utils.logging.LoggerUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-
 /**
  * Telemetry JAX-RS Interface to the PDP-D.
  */
@@ -98,7 +93,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -111,7 +106,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -132,7 +127,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -154,7 +149,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -175,7 +170,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -187,7 +182,7 @@ public class RestManager {
 
     /**
      * POST.
-     * 
+     *
      * @return response object
      */
     @POST
@@ -216,7 +211,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -229,7 +224,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -242,7 +237,7 @@ public class RestManager {
 
     /**
     * GET.
-    * 
+    *
     * @return response object
     */
     @GET
@@ -257,7 +252,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -274,7 +269,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -287,7 +282,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -315,7 +310,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -343,7 +338,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -364,7 +359,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -385,7 +380,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -398,7 +393,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -411,7 +406,7 @@ public class RestManager {
 
     /**
     * POST.
-    * 
+    *
     * @return response object
     */
     @POST
@@ -479,7 +474,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -492,7 +487,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -506,7 +501,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -528,7 +523,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -557,7 +552,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -604,7 +599,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -632,7 +627,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -644,7 +639,7 @@ public class RestManager {
 
     /**
      * POST.
-     * 
+     *
      * @return response object
      */
     @POST
@@ -688,7 +683,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -701,7 +696,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -724,7 +719,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -747,7 +742,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -775,7 +770,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -807,7 +802,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -836,7 +831,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -875,7 +870,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -928,7 +923,7 @@ public class RestManager {
 
     /**
      * POST.
-     * 
+     *
      * @return response object
      */
     @POST
@@ -985,7 +980,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -1027,7 +1022,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -1085,29 +1080,21 @@ public class RestManager {
 
     /**
      * POST.
-     * 
+     *
      * @return response object
      */
     @POST
-    @Path("engine/controllers/tools/coders/decoders/filters/rules/{ruleName}")
+    @Path("engine/controllers/tools/coders/decoders/filters/rule")
     @ApiOperation(value = "Produces a Decoder Rule Filter in a format that the Policy Controller can understand",
             notes = "The result can be used with other APIs to attach a filter to a decoder")
     public Response rules(
-            @ApiParam(value = "Negate regex?",
-                    required = true) @DefaultValue("false") @QueryParam("negate") boolean negate,
-            @ApiParam(value = "Rule Name", required = true) @PathParam("ruleName") String name,
-            @ApiParam(value = "Regex expression", required = true) String regex) {
-        String literalRegex = Pattern.quote(regex);
-        if (negate) {
-            literalRegex = "^(?!" + literalRegex + "$).*";
-        }
-
-        return Response.status(Status.OK).entity(new JsonProtocolFilter.FilterRule(name, literalRegex)).build();
+            @ApiParam(value = "JsonPath expression", required = true) String expression) {
+        return Response.status(Status.OK).entity(new JsonProtocolFilter(expression)).build();
     }
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1142,7 +1129,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1178,7 +1165,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1215,7 +1202,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1258,7 +1245,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1303,7 +1290,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -1359,17 +1346,16 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
-    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rules")
-    @ApiOperation(value = "Gets the filter rules attached to a topic decoder of a controller",
+    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rule")
+    @ApiOperation(value = "Gets the filter rule attached to a topic decoder of a controller",
             notes = "Decoders are associated with networked topics. A Policy Controller manages "
                     + "multiple topics and therefore its attached decoders. "
                     + "A Policy Controller uses filters to further specify the fact mapping.  "
-                    + "Filters are applied on a per fact type and are composed of field matching rules. ",
-            responseContainer = "List", response = FilterRule.class)
+                    + "Filters are applied on a per fact type using a jsonpath expression rule. ")
     @ApiResponses(value = {@ApiResponse(code = 404, message = "The controller, topic, or fact type cannot be found"),
             @ApiResponse(code = 406,
                     message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
@@ -1394,7 +1380,7 @@ public class RestManager {
                         .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
             }
 
-            return Response.status(Response.Status.OK).entity(filter.getRules()).build();
+            return Response.status(Response.Status.OK).entity(filter.getRule()).build();
         } catch (final IllegalArgumentException e) {
             logger.debug("{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}", this,
                     controllerName, topic, factClass, e.getMessage(), e);
@@ -1409,86 +1395,25 @@ public class RestManager {
     }
 
     /**
-     * GET.
-     * 
-     * @return response object
-     */
-    @GET
-    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rules/{ruleName}")
-    @ApiOperation(value = "Gets a filter rule by name attached to a topic decoder of a controller",
-            notes = "Decoders are associated with networked topics. A Policy Controller manages "
-                    + "multiple topics and therefore its attached decoders. "
-                    + "A Policy Controller uses filters to further specify the fact mapping.  "
-                    + "Filters are applied on a per fact type and are composed of field matching rules. ",
-            responseContainer = "List", response = FilterRule.class)
-    @ApiResponses(value = {
-            @ApiResponse(code = 404, message = "The controller, topic, fact type, or rule name cannot be found"),
-            @ApiResponse(code = 406,
-                    message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
-    public Response decoderFilterRules(
-            @ApiParam(value = "Policy Controller Name", required = true) @PathParam("controller") String controllerName,
-            @ApiParam(value = "Topic Name", required = true) @PathParam("topic") String topic,
-            @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass,
-            @ApiParam(value = "Rule Name", required = true) @PathParam("ruleName") String ruleName) {
-        try {
-            final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
-
-            final CoderFilters filters = decoder.getCoder(factClass);
-            if (filters == null) {
-                return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  does not exist")).build();
-            }
-
-            final JsonProtocolFilter filter = filters.getFilter();
-            if (filter == null) {
-                return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
-            }
-
-            return Response.status(Response.Status.OK).entity(filter.getRules(ruleName)).build();
-        } catch (final IllegalArgumentException e) {
-            logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} rule {} because of {}",
-                    this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + ": " + ruleName + " not found"))
-                    .build();
-        } catch (final IllegalStateException e) {
-            logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} rule {} because of {}",
-                    this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(
-                            controllerName + ":" + topic + ":" + factClass + ":" + ruleName + " not acceptable"))
-                    .build();
-        }
-    }
-
-    /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
-    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rules/{ruleName}")
-    @ApiOperation(value = "Deletes a filter rule by name attached to a topic decoder of a controller",
+    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rule")
+    @ApiOperation(value = "Deletes the filter rule attached to a topic decoder of a controller",
             notes = "Decoders are associated with networked topics. A Policy Controller manages "
                     + "multiple topics and therefore its attached decoders. "
                     + "A Policy Controller uses filters to further specify the fact mapping.  "
-                    + "Filters are applied on a per fact type and are composed of field matching rules. ",
-            responseContainer = "List", response = FilterRule.class)
+                    + "Filters are applied on a per fact type using a jsonpath expression rule. ")
     @ApiResponses(value = {
-            @ApiResponse(code = 404, message = "The controller, topic, fact type, or rule name cannot be found"),
+            @ApiResponse(code = 404, message = "The controller, topic, or fact type cannot be found"),
             @ApiResponse(code = 406,
                     message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
     public Response decoderFilterRuleDelete(
             @ApiParam(value = "Policy Controller Name", required = true) @PathParam("controller") String controllerName,
             @ApiParam(value = "Topic Name", required = true) @PathParam("topic") String topic,
-            @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass,
-            @ApiParam(value = "Rule Name", required = true) @PathParam("ruleName") String ruleName,
-            @ApiParam(value = "Filter Rule", required = true) FilterRule rule) {
+            @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass) {
 
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
@@ -1507,50 +1432,38 @@ public class RestManager {
                         .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
             }
 
-            if (rule == null) {
-                filter.deleteRules(ruleName);
-                return Response.status(Response.Status.OK).entity(filter.getRules()).build();
-            }
-
-            if (rule.getName() == null || !rule.getName().equals(ruleName)) {
-                return Response.status(Response.Status.BAD_REQUEST).entity(new Error(controllerName + ":" + topic + ":"
-                        + factClass + ":" + ruleName + " rule name request inconsistencies (" + rule.getName() + ")"))
-                        .build();
-            }
-
-            filter.deleteRule(ruleName, rule.getRegex());
-            return Response.status(Response.Status.OK).entity(filter.getRules()).build();
+            filter.setRule(null);
+            return Response.status(Response.Status.OK).entity(filter.getRule()).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} rule {} because of {}",
-                    this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
+                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}",
+                    this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + ": " + ruleName + " not found"))
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found"))
                     .build();
         } catch (final IllegalStateException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} rule {} because of {}",
-                    this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
+                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}",
+                    this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(
-                            controllerName + ":" + topic + ":" + factClass + ":" + ruleName + " not acceptable"))
+                            controllerName + ":" + topic + ":" + factClass + " not acceptable"))
                     .build();
         }
     }
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
-    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rules")
+    @Path("engine/controllers/{controller}/decoders/{topic}/filters/{factType}/rule")
     @ApiOperation(value = "Places a new filter rule in a topic decoder",
             notes = "Decoders are associated with networked topics. A Policy Controller manages "
                     + "multiple topics and therefore its attached decoders. "
                     + "A Policy Controller uses filters to further specify the fact mapping.  "
-                    + "Filters are applied on a per fact type and are composed of field matching rules. ",
-            responseContainer = "List", response = FilterRule.class)
+                    + "Filters are applied on a per fact type using a jsonpath expression rule. ")
     @ApiResponses(value = {@ApiResponse(code = 404, message = "The controller, topic, or fact type cannot be found"),
             @ApiResponse(code = 406,
                     message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
@@ -1558,8 +1471,7 @@ public class RestManager {
             @ApiParam(value = "Policy Controller Name", required = true) @PathParam("controller") String controllerName,
             @ApiParam(value = "Topic Name", required = true) @PathParam("topic") String topic,
             @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass,
-            @ApiParam(value = "Rule Name", required = true) @PathParam("ruleName") String ruleName,
-            @ApiParam(value = "Filter Rule", required = true) FilterRule rule) {
+            @ApiParam(value = "JsonPath filter expression", required = true) String rule) {
 
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
@@ -1578,25 +1490,25 @@ public class RestManager {
                         .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
             }
 
-            if (rule.getName() == null) {
+            if (rule == null || rule.isEmpty()) {
                 return Response.status(Response.Status.BAD_REQUEST).entity(new Error(controllerName + ":" + topic + ":"
-                        + factClass + " rule name request inconsistencies (" + rule.getName() + ")")).build();
+                        + factClass + " no filter rule provided")).build();
             }
 
-            filter.addRule(rule.getName(), rule.getRegex());
-            return Response.status(Response.Status.OK).entity(filter.getRules()).build();
+            filter.setRule(rule);
+            return Response.status(Response.Status.OK).entity(filter.getRule()).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
                     "{}: cannot access decoder filter rules for policy-controller {} "
-                            + "topic {} type {} rule {} because of {}",
-                            this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
+                            + "topic {} type {} because of {}",
+                            this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + " not found")).build();
         } catch (final IllegalStateException e) {
             logger.debug(
                     "{}: cannot access decoder filter rules for policy-controller {} "
-                            + "topic {} type {} rule {} because of {}",
-                            this, controllerName, topic, factClass, ruleName, e.getMessage(), e);
+                            + "topic {} type {} because of {}",
+                            this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not acceptable")).build();
         }
@@ -1604,7 +1516,7 @@ public class RestManager {
 
     /**
      * POST.
-     * 
+     *
      * @return response object
      */
     @POST
@@ -1665,7 +1577,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1715,7 +1627,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -1735,7 +1647,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -1755,7 +1667,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1768,7 +1680,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1781,7 +1693,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1794,7 +1706,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1807,7 +1719,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1820,7 +1732,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1833,7 +1745,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1847,7 +1759,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1861,7 +1773,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1876,7 +1788,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1890,7 +1802,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1905,7 +1817,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1920,7 +1832,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1936,7 +1848,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1951,7 +1863,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1964,7 +1876,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1977,7 +1889,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -1991,7 +1903,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -2004,7 +1916,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -2024,7 +1936,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -2048,7 +1960,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -2061,7 +1973,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -2081,7 +1993,7 @@ public class RestManager {
 
     /**
      * DELETE.
-     * 
+     *
      * @return response object
      */
     @DELETE
@@ -2102,7 +2014,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -2146,7 +2058,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
@@ -2190,7 +2102,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -2203,7 +2115,7 @@ public class RestManager {
 
     /**
     * GET.
-    * 
+    *
     * @return response object
     */
     @GET
@@ -2227,7 +2139,7 @@ public class RestManager {
 
     /**
      * GET.
-     * 
+     *
      * @return response object
      */
     @GET
@@ -2255,7 +2167,7 @@ public class RestManager {
 
     /**
      * PUT.
-     * 
+     *
      * @return response object
      */
     @PUT
diff --git a/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilterTest.java b/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilterTest.java
index e83e5880..e0baeb6d 100644
--- a/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilterTest.java
+++ b/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/JsonProtocolFilterTest.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,205 +24,140 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import org.junit.Test;
-import org.onap.policy.drools.protocol.coders.JsonProtocolFilter.FilterRule;
-import org.onap.policy.drools.utils.Pair;
-
 
 public class JsonProtocolFilterTest {
 
-    private static final String NAME1 = "name1";
-    private static final String REGEX1 = "regex1";
+    private static final String JSON =
+                    "{\"requestID\":\"38adde30-cc22-11e8-a8d5-f2801f1b9fd1\",\"entity\":\"controller\","
+                                    + "\"controllers\":[{\"name\":\"test-controller\","
+                                    + "\"drools\":{\"groupId\":\"org.onap.policy.drools.test\","
+                                    + "\"artifactId\":\"test\",\"version\":\"0.0.1\"},\"operation\":\"update\"}]}";
+
+    /**
+     * Tests getting the rule expression of the filter.
+     */
+    @Test
+    public void getRuleTest() {
+        assertEquals("$.test", new JsonProtocolFilter("$.test").getRule());
+    }
+
+    /**
+     * Tests setting the rule expression of the filter.
+     */
+    @Test
+    public void setRuleTest() {
+        JsonProtocolFilter filter = new JsonProtocolFilter();
+        assertEquals(JsonProtocolFilter.MATCH_ANY, filter.getRule());
+        filter.setRule("$.test");
+        assertEquals("$.test", filter.getRule());
+    }
+
+    /**
+     * Tests that the rule expression will be set to match anything if an empty string is passed.
+     */
+    @Test
+    public void setRuleEmptyTest() {
+        assertEquals(JsonProtocolFilter.MATCH_ANY, new JsonProtocolFilter("").getRule());
+    }
+
+    /**
+     * Tests that the rule expression will be set to match anything if a null string is passed.
+     */
+    @Test
+    public void setRuleNullTest() {
+        assertEquals(JsonProtocolFilter.MATCH_ANY, new JsonProtocolFilter(null).getRule());
+    }
+
+    /**
+     * Tests accepting a message if all filter rules pass.
+     */
+    @Test
+    public void acceptPassTest() {
+        assertTrue(new JsonProtocolFilter(
+                        "$.controllers[?(@.drools.version =~ /\\d\\.\\d\\.\\d/ && @.operation == 'update')]")
+                                        .accept(JSON));
+    }
+
+    /**
+     * Tests accepting a message without having to filter if the rule is set to match anything.
+     */
+    @Test
+    public void acceptAnyTest() {
+        assertTrue(new JsonProtocolFilter(null).accept(JSON));
+    }
 
-    private static final String NAME2 = "name2";
-    private static final String REGEX2 = "regex2";
+    /**
+     * Tests rejecting a message if one or more of the filter rules fail.
+     */
+    @Test
+    public void acceptFailTest() {
+        assertFalse(
+            new JsonProtocolFilter("$.controllers[?(@.drools.version =~ /\\\\d\\\\.\\\\d\\\\.2/)]")
+                .accept(JSON));
+    }
 
-    private static final String NAME3 = "name3";
-    private static final String REGEX3 = "regex3";
+    /**
+     * Tests finding field matches for a filter rule corresponding to a topic.
+     */
+    @Test
+    public void filterPassTest() {
+        assertEquals("38adde30-cc22-11e8-a8d5-f2801f1b9fd1", new JsonProtocolFilter("$.requestID").filter(JSON).get(0));
+    }
+
+    /**
+     * Tests that an empty list is returned when no matches are found.
+     */
+    @Test
+    public void filterFailTest() {
+        assertTrue(new JsonProtocolFilter("$.test").filter(JSON).isEmpty());
+    }
 
-    private static final String NAME4 = "name4";
-    private static final String REGEX4a = "^regex4a.*";
-    private static final String REGEX4b = ".*regex4b$";
-    
+    /**
+     * Tests static method for filtering a JSON string with an arbitrary expression.
+     */
+    @Test
+    public void staticFilterPassTest() {
+        assertEquals("controller", JsonProtocolFilter.filter(JSON, "$.entity").get(0));
+    }
 
+    /**
+     * Tests that an empty list is returned when the static filter() method does not find any matches.
+     */
     @Test
-    public void test() {
-        
-        //      ********************   D E F I N E   f i l t e r R u l e   O b j e c t s   ***************************
-        //      DEFINE one (1) filterRule object (using constructor without parms passed; instead use set methods
-        FilterRule filterRule1 = new FilterRule();
-        filterRule1.setName(NAME1);
-        filterRule1.setRegex(REGEX1);
-        assertEquals(filterRule1.getName(), NAME1);
-        assertEquals(filterRule1.getRegex(), REGEX1);
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      DEFINE four (4) filterRule objects (using constructor passing the field values
-        FilterRule filterRule2 = new FilterRule(NAME2, REGEX2);
-        assertEquals(filterRule2.getName(), NAME2);
-        assertEquals(filterRule2.getRegex(), REGEX2);
-
-        FilterRule filterRule3 = new FilterRule(NAME3, REGEX3);
-        assertEquals(filterRule3.getName(), NAME3);
-        assertEquals(filterRule3.getRegex(), REGEX3);
-
-        FilterRule filterRule4a = new FilterRule(NAME4, REGEX4a);
-        assertEquals(filterRule4a.getName(), NAME4);
-        assertEquals(filterRule4a.getRegex(), REGEX4a);
-
-        FilterRule filterRule4b = new FilterRule(NAME4, REGEX4b);
-        assertEquals(filterRule4b.getName(), NAME4);
-        assertEquals(filterRule4b.getRegex(), REGEX4b);
-
-
-
-        //      ************************   D E F I N E   f i l t e r   L i s t s  ************************************
-        //      DEFINE rawFiltersA
-        List<Pair<String,String>> rawFiltersA = new ArrayList<>();
-        rawFiltersA.add(new Pair<String,String>(filterRule1.getName(), filterRule1.getRegex()));
-        rawFiltersA.add(new Pair<String,String>(filterRule2.getName(), filterRule2.getRegex()));
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      DEFINE filtersA 
-        List<FilterRule> filtersA = new ArrayList<>();
-        for (Pair<String, String> filterPair: rawFiltersA) {
-            if  (filterPair.first() == null || filterPair.first().isEmpty()) {
-                continue;
-            }
-            filtersA.add(new FilterRule(filterPair.first(), filterPair.second()));
-        }
-
-
-
-        //      ***********   I N S T A N T I A T E   J s o n P r o t o c o l F i l t e r   O b j e c t s   **********
-        //      INSTANTIATE protocolFilterA  (passing raw filters to the 'fromRawFilters' constructor)
-        JsonProtocolFilter protocolFilterA = JsonProtocolFilter.fromRawFilters(rawFiltersA);
-        assertTrue(protocolFilterA.isRules());
-        assertEquals(protocolFilterA.getRules().toString(), filtersA.toString());
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      INSTANTIATE protocolFilterB  (passing filters list to constructor which accepts such)
-        JsonProtocolFilter protocolFilterB = new JsonProtocolFilter(filtersA);
-        assertTrue(protocolFilterB.isRules());
-        assertEquals(protocolFilterB.getRules(), filtersA);
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      INSTANTIATE protocolFilterC  (using constructor without parms; add instead using setRules() method
-        JsonProtocolFilter protocolFilterC = new JsonProtocolFilter();
-        protocolFilterC.setRules(filtersA);
-        assertTrue(protocolFilterC.isRules());
-        assertEquals(protocolFilterC.getRules(), filtersA);
-
-
-
-        //      ***   D E F I N E   o t h e r   f i l t e r   L i s t s   f o r   v a l i d a t i o n s   ************
-        //      DEFINE rawFiltersB
-        List<Pair<String,String>> rawFiltersB = new ArrayList<>();
-        rawFiltersB.add(new Pair<String,String>(filterRule1.getName(), filterRule1.getRegex()));
-        rawFiltersB.add(new Pair<String,String>(filterRule2.getName(), filterRule2.getRegex()));
-        rawFiltersB.add(new Pair<String,String>(filterRule3.getName(), filterRule3.getRegex()));
-        rawFiltersB.add(new Pair<String,String>(filterRule4a.getName(), filterRule4a.getRegex()));
-        rawFiltersB.add(new Pair<String,String>(filterRule4b.getName(), filterRule4b.getRegex()));
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      DEFINE filtersB
-        List<FilterRule> filtersB = new ArrayList<>();
-        for (Pair<String, String> filterPair: rawFiltersB) {
-            filtersB.add(new FilterRule(filterPair.first(), filterPair.second()));
-        }
-
-
-
-        //      ***********   A D D   T O   p r o t o c o l F i l t e r B   3   m o r e   f i l t e r s   ************
-        protocolFilterB.addRule(filterRule3.getName(), filterRule3.getRegex());
-        protocolFilterB.addRule(filterRule4a.getName(), filterRule4a.getRegex());
-        protocolFilterB.addRule(filterRule4b.getName(), filterRule4b.getRegex());
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      VALIDATE that protocolFilterB now contains filters passed using filtersA and the new ones just added
-        assertEquals(protocolFilterB.getRules().toString(), filtersB.toString());
-
-
-
-        //      ************   D E L E T E   f i l t e r s   f r o m   p r o t o c o l F i l t e r B       ***********
-        //      DELETE specific filter from protocolFilterB by passing both the name & regex values
-
-        assertTrue(protocolFilterB.getRules(NAME3).size() == 1);
-        assertTrue(protocolFilterB.getRules(NAME3).get(0).getName().equals(NAME3));
-        assertTrue(protocolFilterB.getRules(NAME3).get(0).getRegex().equals(REGEX3));
-
-        assertTrue(protocolFilterB.getRules(NAME4).size() == 2);
-        assertTrue(protocolFilterB.getRules(NAME4).get(0).getName().equals(NAME4));
-        assertTrue(protocolFilterB.getRules(NAME4).get(0).getRegex().equals(REGEX4a));
-        assertTrue(protocolFilterB.getRules(NAME4).get(1).getName().equals(NAME4));
-        assertTrue(protocolFilterB.getRules(NAME4).get(1).getRegex().equals(REGEX4b));
-
-        final String jsonA = "{ \"name1\":\"regex1\",\"name2\":\"regex2\","
-                        + "\"name3\":\"regex3\",\"name4\":\"regex4a\",\"name4\":\"regex4b\"}";
-        final String jsonB = "{ \"name1\":\"regex1\",\"name2\":\"regex2\","
-                        + "\"name3\":\"regex3\",\"name4\":\"regex4a-regex4b\"}";
-        final String jsonC = "{ \"name1\":\"regex1\",\"name2\":\"regex2\","
-                        + "\"name3\":\"regex3\",\"name4\":\"regex4a\"}";
-        final String jsonD = "{ \"name1\":\"regex1\",\"name2\":\"regex2\","
-                        + "\"name3\":\"regex3\",\"name4\":\"regex4b\"}";
-
-        assertFalse(protocolFilterB.accept(jsonA));
-        assertTrue(protocolFilterB.accept(jsonB));
-        assertFalse(protocolFilterB.accept(jsonC));
-        assertFalse(protocolFilterB.accept(jsonD));
-
-        protocolFilterB.deleteRule(NAME4, REGEX4a);
-
-        assertTrue(protocolFilterB.accept(jsonA));
-        assertTrue(protocolFilterB.accept(jsonB));
-        assertFalse(protocolFilterB.accept(jsonC));
-        assertTrue(protocolFilterB.accept(jsonD));
-
-        protocolFilterB.addRule(NAME4, REGEX4a);
-
-        assertTrue(protocolFilterB.getRules(NAME4).size() == 2);
-        assertTrue(protocolFilterB.getRules(NAME4).get(0).getName().equals(NAME4));
-        assertTrue(protocolFilterB.getRules(NAME4).get(0).getRegex().equals(REGEX4b));
-        assertTrue(protocolFilterB.getRules(NAME4).get(1).getName().equals(NAME4));
-        assertTrue(protocolFilterB.getRules(NAME4).get(1).getRegex().equals(REGEX4a));
-
-        assertFalse(protocolFilterB.accept(jsonA));
-        assertTrue(protocolFilterB.accept(jsonB));
-        assertFalse(protocolFilterB.accept(jsonC));
-        assertFalse(protocolFilterB.accept(jsonD));
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      DELETE all filters from protocolFilterB that have a match to the same name value
-        protocolFilterB.deleteRules(NAME4);
-
-        assertTrue(protocolFilterB.getRules(NAME4).isEmpty());
-        assertTrue(protocolFilterB.accept(jsonA));
-        assertTrue(protocolFilterB.accept(jsonB));
-        assertTrue(protocolFilterB.accept(jsonC));
-        assertTrue(protocolFilterB.accept(jsonD));
-
-        assertTrue(protocolFilterB.getRules(NAME3).size() == 1);
-        protocolFilterB.addRule(NAME3, REGEX3);
-        assertTrue(protocolFilterB.getRules(NAME3).size() == 1);
-        protocolFilterB.deleteRule(NAME3, REGEX3);
-        assertTrue(protocolFilterB.getRules(NAME3).isEmpty());
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      VALIDATE that protocolFilterB now only contains the filters that were originally passed using filtersA
-        assertEquals(protocolFilterB.getRules(), filtersA);
-
-        //      ************   A C C E P T   J S O N   I F   I T   P A S S E S   A L L   F I L T E R S     ***********
-        //      ACCEPT TRUE a JSON that passes all filters
-        String jsonE = "{ \"name1\":\"regex1\",\"name2\":\"regex2\"}";
-        assertTrue(protocolFilterA.accept(jsonE));
-
-        //      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-        //      ACCEPT FALSE a JSON that does NOT pass all filters
-        String jsonF = "{ \"name1\":\"regex1\"}";
-        assertFalse(protocolFilterA.accept(jsonF));
+    public void staticFilterFailTest() {
+        assertTrue(JsonProtocolFilter.filter(JSON, "$.test").isEmpty());
     }
 
+    /**
+     * Tests that an exception is thrown if a null JSON string is passed.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void staticFilterNullJsonTest() {
+        JsonProtocolFilter.filter(null, "[?($ =~ /.*/");
+    }
+
+    /**
+     * Tests that an exception is thrown if an empty JSON string is passed.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void staticFilterEmptyJsonTest() {
+        JsonProtocolFilter.filter("", "[?($ =~ /.*/");
+    }
+
+    /**
+     * Tests that an exception is thrown if a null expression string is passed.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void staticFilterNullExpressionTest() {
+        JsonProtocolFilter.filter("{\"hello\":\"world\"}", null);
+    }
+
+    /**
+     * Tests that an exception is thrown if an empty expression string is passed.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void staticFilterEmptyExpressionTest() {
+        JsonProtocolFilter.filter("{\"hello\":\"world\"}", "");
+    }
 }
\ No newline at end of file
diff --git a/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolsetTest.java b/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolsetTest.java
index da491261..b7d72f31 100644
--- a/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolsetTest.java
+++ b/policy-management/src/test/java/org/onap/policy/drools/protocol/coders/ProtocolCoderToolsetTest.java
@@ -25,7 +25,6 @@ import com.google.gson.GsonBuilder;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Properties;
 import org.junit.Assert;
@@ -39,7 +38,6 @@ import org.onap.policy.drools.controller.DroolsController;
 import org.onap.policy.drools.controller.internal.MavenDroolsControllerTest;
 import org.onap.policy.drools.properties.DroolsProperties;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder.CoderFilters;
-import org.onap.policy.drools.protocol.coders.JsonProtocolFilter.FilterRule;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration.CustomGsonCoder;
 import org.onap.policy.drools.util.KieUtils;
 import org.onap.policy.drools.utils.Triple;
@@ -64,7 +62,7 @@ public class ProtocolCoderToolsetTest {
 
     /**
      * Setup.
-     * 
+     *
      * @throws IOException throws IO Exception
      */
     @Before
@@ -96,7 +94,7 @@ public class ProtocolCoderToolsetTest {
 
     /**
      * Test the Gson toolset.
-     * 
+     *
      * @param protocolFilter protocol filter
      */
     public void testGsonToolset(JsonProtocolFilter protocolFilter) {
@@ -157,11 +155,9 @@ public class ProtocolCoderToolsetTest {
         CoderFilters coderFilters = coderToolset.getCoder(Triple.class.getCanonicalName());
         Assert.assertTrue(coderFilters.getCodedClass() == Triple.class.getCanonicalName());
         Assert.assertTrue(coderFilters.getFilter() == protocolFilter);
-        Assert.assertTrue(coderFilters.getFilter().getRules("second").size() == 1);
-        Assert.assertTrue(coderFilters.getFilter().getRules("third").size() == 1);
+        Assert.assertTrue(coderFilters.getFilter().getRule() != null);
 
-        coderFilters.getFilter().getRules("second").get(0).setRegex("^v2$");
-        coderFilters.getFilter().getRules("third").get(0).setRegex(".*v3.*");
+        coderFilters.getFilter().setRule("[?($.second =~ /^v2$/ && $.third =~ /.*v3.*/)]");
 
         tripleDecoded = (Triple<String, String, String>) coderToolset.decode(tripleEncoded);
 
@@ -169,8 +165,8 @@ public class ProtocolCoderToolsetTest {
         Assert.assertTrue(tripleDecoded.second().equals(triple.second()));
         Assert.assertTrue(tripleDecoded.third().equals(triple.third()));
 
-        coderFilters.getFilter().deleteRules("third");
-        Assert.assertTrue(coderFilters.getFilter().getRules("third").isEmpty());
+        coderFilters.getFilter().setRule(null);
+        Assert.assertEquals("[?($ =~ /.*/)]", coderFilters.getFilter().getRule());
 
         tripleDecoded = (Triple<String, String, String>) coderToolset.decode(tripleEncoded);
 
@@ -178,7 +174,7 @@ public class ProtocolCoderToolsetTest {
         Assert.assertTrue(tripleDecoded.second().equals(triple.second()));
         Assert.assertTrue(tripleDecoded.third().equals(triple.third()));
 
-        coderFilters.getFilter().addRule("third", ".*v3.*");
+        coderFilters.getFilter().setRule("[?($.third =~ /.*v3.*/)]");
     }
 
     private String encode(ProtocolCoderToolset coderToolset, Triple<String, String, String> triple) {
@@ -188,10 +184,8 @@ public class ProtocolCoderToolsetTest {
     }
 
     private void addRemoveCoder(ProtocolCoderToolset coderToolset) {
-        List<FilterRule> filters = new ArrayList<>();
-        filters.add(new FilterRule("second", ".*"));
-
-        coderToolset.addCoder(this.getClass().getCanonicalName(), new JsonProtocolFilter(filters), 654321);
+        coderToolset.addCoder(this.getClass().getCanonicalName(),
+                new JsonProtocolFilter("[?($.second =~ /.*/)]"), 654321);
         Assert.assertTrue(coderToolset.getCoders().size() == 2);
 
         coderToolset.removeCoders(this.getClass().getCanonicalName());
@@ -199,22 +193,18 @@ public class ProtocolCoderToolsetTest {
     }
 
     private void updateCoderFilterRule(ProtocolCoderToolset coderToolset) {
-        List<FilterRule> filters = new ArrayList<>();
-        filters.add(new FilterRule("third", ".*"));
-        coderToolset.addCoder(Triple.class.getCanonicalName(), new JsonProtocolFilter(filters), 654321);
+        coderToolset.addCoder(Triple.class.getCanonicalName(), new JsonProtocolFilter("[?($.third =~ /.*/)]"), 654321);
 
         Assert.assertTrue(coderToolset.getCoders().size() == 1);
 
         Assert.assertTrue(coderToolset.getCoder(Triple.class.getCanonicalName()).getModelClassLoaderHash() == 654321);
 
         Assert.assertTrue(
-                coderToolset.getCoder(Triple.class.getCanonicalName()).getFilter().getRules("third").size() == 1);
-
-        Assert.assertTrue(
-                coderToolset.getCoder(Triple.class.getCanonicalName()).getFilter().getRules("third").size() == 1);
+                coderToolset.getCoder(
+                        Triple.class.getCanonicalName()).getFilter().getRule() != null);
 
-        Assert.assertTrue(".*".equals(coderToolset.getCoder(Triple.class.getCanonicalName()).getFilter()
-                .getRules("third").get(0).getRegex()));
+        Assert.assertTrue("[?($.third =~ /.*/)]".equals(coderToolset.getCoder(Triple.class.getCanonicalName())
+                .getFilter().getRule()));
     }
 
     private void validateInitialization(JsonProtocolFilter protocolFilter, ProtocolCoderToolset coderToolset) {
@@ -254,11 +244,6 @@ public class ProtocolCoderToolsetTest {
     }
 
     private JsonProtocolFilter createFilterSet() {
-        List<FilterRule> filters = new ArrayList<>();
-        filters.add(new FilterRule("first", ".*"));
-        filters.add(new FilterRule("second", "^blah.*"));
-        filters.add(new FilterRule("third", "^hello$"));
-
-        return new JsonProtocolFilter(filters);
+        return new JsonProtocolFilter("[?($.first =~ /.*/ && $.second =~ /^blah.*/ && $.third =~ /^hello$/)]");
     }
 }