2 files changed, 69 insertions, 7 deletions

diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfConceptContainer.java b/models-base/src/main/java/org/onap/policy/models/base/PfConceptContainer.java
index 65a28cffe..2576aab0a 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfConceptContainer.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfConceptContainer.java
@@ -33,6 +33,7 @@ import java.util.TreeMap;
 import javax.persistence.CascadeType;
 import javax.persistence.EmbeddedId;
 import javax.persistence.Entity;
+import javax.persistence.FetchType;
 import javax.persistence.ManyToMany;
 import javax.persistence.Table;
 import javax.ws.rs.core.Response;
@@ -69,7 +70,7 @@ public class PfConceptContainer<C extends PfConcept, A extends PfNameVersion> ex
     @EmbeddedId
     private PfConceptKey key;
 
-    @ManyToMany(cascade = CascadeType.ALL)
+    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
     private Map<PfConceptKey, C> conceptMap;
 
     /**
diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfObjectFilter.java b/models-base/src/main/java/org/onap/policy/models/base/PfObjectFilter.java
index 10ce4ea60..f4e457192 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfObjectFilter.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfObjectFilter.java
@@ -24,8 +24,9 @@ package org.onap.policy.models.base;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-
-import lombok.NonNull;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.regex.Pattern;
 
 /**
  * Interface for filtering a list of concepts.
@@ -43,14 +44,74 @@ public interface PfObjectFilter<T extends Comparable<T>> {
     public List<T> filter(final List<T> originalList);
 
     /**
-     * Check if a value matches a regular expression.
+     * Check if a value exactly equals some text.
      *
      * @param value the incoming value to check
-     * @param pattern the pattern to check against
+     * @param text the desired text to check against
      * @return match or not
      */
-    public default boolean filterString(final String value, final String pattern) {
-        return value == null || pattern == null || value.equals(pattern);
+    public default boolean filterString(final String value, final String text) {
+        return value == null || text == null || value.equals(text);
+    }
+
+    /**
+     * Gets a predicate used to filter an item in a list by exactly matching an extracted value
+     * with some text.
+     *
+     * @param text the desired text to check against, or {@code null} if to accept everything
+     * @param extractor function to extract the value, to be matched, from a list item
+     * @return a predicate to match a value from a list item
+     */
+    public default Predicate<T> filterStringPred(final String text, Function<T, String> extractor) {
+        // if null text, then everything matches
+        if (text == null) {
+            return item -> true;
+        }
+
+        return item -> text.equals(extractor.apply(item));
+    }
+
+    /**
+     * Gets a predicate used to filter an item in a list by comparing the start of an
+     * extracted value with a prefix.
+     *
+     * @param prefix the desired prefix to check against, or {@code null} if to accept
+     *        everything
+     * @param extractor function to extract the value, to be matched, from a list item
+     * @return a predicate to match a prefix with a value from a list item
+     */
+    public default Predicate<T> filterPrefixPred(final String prefix, Function<T, String> extractor) {
+        // if null prefix, then everything matches
+        if (prefix == null) {
+            return item -> true;
+        }
+
+        return item -> {
+            String value = extractor.apply(item);
+            return (value != null && value.startsWith(prefix));
+        };
+    }
+
+    /**
+     * Gets a predicate used to filter an item in a list by matching an extracted value
+     * with a regular expression.
+     *
+     * @param pattern regular expression to match, or {@code null} if to accept everything
+     * @param extractor function to extract the value, to be matched, from a list item
+     * @return a predicate to match a value from a list item using a regular expression
+     */
+    public default Predicate<T> filterRegexpPred(final String pattern, Function<T, String> extractor) {
+        // if null pattern, then everything matches
+        if (pattern == null) {
+            return item -> true;
+        }
+
+        Pattern pat = Pattern.compile(pattern);
+
+        return item -> {
+            String value = extractor.apply(item);
+            return (value != null && pat.matcher(value).matches());
+        };
     }
 
     /**