Refactor to move from openecomp to onap

Refactor to move from openecomp to onap
IssueID: AAI-486

Change-Id: I1d5634739514acf11d5fbdf5e2c7865aaccd864e
Signed-off-by: Bansal, Nitin (nb121v) <nitin.bansal@amdocs.com>

4 files changed, 1054 insertions, 0 deletions

diff --git a/src/main/java/org/onap/schema/OxmModelValidator.java b/src/main/java/org/onap/schema/OxmModelValidator.java
new file mode 100644
index 0000000..d23804c
--- /dev/null
+++ b/src/main/java/org/onap/schema/OxmModelValidator.java
@@ -0,0 +1,331 @@
+/**
+ * ============LICENSE_START=======================================================
+ * Gizmo
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.schema;
+
+import com.google.common.base.CaseFormat;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+
+import org.eclipse.persistence.dynamic.DynamicType;
+import org.eclipse.persistence.internal.helper.DatabaseField;
+import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext;
+import org.eclipse.persistence.mappings.DatabaseMapping;
+import org.eclipse.persistence.oxm.XMLField;
+import org.onap.aaiutils.oxm.OxmModelLoader;
+import org.onap.crud.entity.Vertex;
+import org.onap.crud.exception.CrudException;
+import org.onap.crud.util.CrudServiceUtil;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import javax.ws.rs.core.Response.Status;
+
+public class OxmModelValidator {
+  public enum Metadata {
+    NODE_TYPE("aai-node-type"), URI("aai-uri"), CREATED_TS("aai-created-ts"), SOT("source-of-truth"), LAST_MOD_SOT(
+        "last-mod-source-of-truth");
+
+    private final String propName;
+
+    Metadata(String propName) {
+      this.propName = propName;
+    }
+
+    public String propertyName() {
+      return propName;
+    }
+
+    public static boolean isProperty(String property) {
+      for (Metadata meta : Metadata.values()) {
+        if (meta.propName.equals(property)) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+
+  public static Map<String, Object> resolveCollectionfilter(String version, String type, Map<String, String> filter)
+      throws CrudException {
+
+    DynamicJAXBContext jaxbContext = null;
+    try {
+      jaxbContext = OxmModelLoader.getContextForVersion(version);
+    } catch (Exception e) {
+      throw new CrudException(e);
+    }
+
+    Map<String, Object> result = new HashMap<String, Object>();
+    if (jaxbContext == null) {
+      throw new CrudException("", Status.NOT_FOUND);
+    }
+    final DynamicType modelObjectType = jaxbContext.getDynamicType(
+        CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL, CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, type)));
+
+    for (String key : filter.keySet()) {
+      String keyJavaName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, key);
+      if (modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName) != null) {
+        try {
+          DatabaseMapping mapping = modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName);
+          Object value = CrudServiceUtil.validateFieldType(filter.get(key), mapping.getField().getType());
+          result.put(key, value);
+        } catch (Exception ex) {
+          // Skip any exceptions thrown while validating the filter
+          // key value
+          continue;
+        }
+      }
+    }
+
+    return result;
+
+  }
+
+  public static String resolveCollectionType(String version, String type) throws CrudException {
+
+    DynamicJAXBContext jaxbContext = null;
+    try {
+      jaxbContext = OxmModelLoader.getContextForVersion(version);
+    } catch (Exception e) {
+      throw new CrudException(e);
+    }
+
+    if (jaxbContext == null) {
+      throw new CrudException("", Status.NOT_FOUND);
+    }
+    // Determine if the Object part is a collection type in the model
+    // definition
+    final DynamicType modelObjectType = jaxbContext.getDynamicType(
+        CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL, CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, type)));
+
+    if (modelObjectType == null) {
+      throw new CrudException("", Status.NOT_FOUND);
+    }
+
+    if (modelObjectType.getDescriptor().getMappings().size() == 1
+        && modelObjectType.getDescriptor().getMappings().get(0).isCollectionMapping()) {
+      String childJavaObjectName = modelObjectType.getDescriptor().getMappings().get(0).getAttributeName();
+      childJavaObjectName = CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL, childJavaObjectName);
+      final DynamicType childObjectType = jaxbContext.getDynamicType(childJavaObjectName);
+      if (childObjectType == null) {
+        // Should not happen as child object is defined in oxm model
+        // itself
+        throw new CrudException("", Status.NOT_FOUND);
+      }
+      return childObjectType.getDescriptor().getTableName();
+    } else {
+      return modelObjectType.getDescriptor().getTableName();
+    }
+
+  }
+
+  public static Vertex validateIncomingUpsertPayload(String id, String version, String type, JsonElement properties)
+      throws CrudException {
+
+    try {
+      type = resolveCollectionType(version, type);
+      DynamicJAXBContext jaxbContext = OxmModelLoader.getContextForVersion(version);
+      String modelObjectClass = CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL,
+          CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, type));
+
+      final DynamicType modelObjectType = jaxbContext.getDynamicType(modelObjectClass);
+      final DynamicType reservedType = jaxbContext.getDynamicType("ReservedPropNames");
+
+      Set<Map.Entry<String, JsonElement>> payloadEntriesSet = properties.getAsJsonObject().entrySet();
+
+      // loop through input to validate against schema
+      for (Map.Entry<String, JsonElement> entry : payloadEntriesSet) {
+        String keyJavaName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, entry.getKey());
+
+        // check for valid field
+        if (modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName) == null) {
+          if (reservedType.getDescriptor().getMappingForAttributeName(keyJavaName) == null) {
+            throw new CrudException("Invalid field: " + entry.getKey(), Status.BAD_REQUEST);
+          }
+        }
+
+      }
+
+      Map<String, JsonElement> entriesMap = new HashMap<String, JsonElement>();
+      for (Map.Entry<String, JsonElement> entry : payloadEntriesSet) {
+        entriesMap.put(entry.getKey(), entry.getValue());
+      }
+
+      Vertex.Builder modelVertexBuilder = new Vertex.Builder(type);
+      if (id != null) {
+        modelVertexBuilder.id(id);
+      }
+      for (DatabaseMapping mapping : modelObjectType.getDescriptor().getMappings()) {
+        if (mapping.isAbstractDirectMapping()) {
+          DatabaseField field = mapping.getField();
+          String defaultValue = mapping.getProperties().get("defaultValue") == null ? ""
+              : mapping.getProperties().get("defaultValue").toString();
+
+          String keyName = field.getName().substring(0, field.getName().indexOf("/"));
+
+          if (((XMLField) field).isRequired() && !entriesMap.containsKey(keyName) && !defaultValue.isEmpty()) {
+            modelVertexBuilder.property(keyName, CrudServiceUtil.validateFieldType(defaultValue, field.getType()));
+          }
+          // if schema field is required and not set then reject
+          if (((XMLField) field).isRequired() && !entriesMap.containsKey(keyName) && defaultValue.isEmpty()) {
+            throw new CrudException("Missing required field: " + keyName, Status.BAD_REQUEST);
+          }
+          // If invalid field then reject
+          if (entriesMap.containsKey(keyName)) {
+            Object value = CrudServiceUtil.validateFieldType(entriesMap.get(keyName).getAsString(), field.getType());
+            modelVertexBuilder.property(keyName, value);
+          }
+
+          // Set defaults
+          if (!defaultValue.isEmpty() && !entriesMap.containsKey(keyName)) {
+            modelVertexBuilder.property(keyName, CrudServiceUtil.validateFieldType(defaultValue, field.getType()));
+          }
+        }
+      }
+
+      // Handle reserved properties
+      for (DatabaseMapping mapping : reservedType.getDescriptor().getMappings()) {
+        if (mapping.isAbstractDirectMapping()) {
+          DatabaseField field = mapping.getField();
+          String keyName = field.getName().substring(0, field.getName().indexOf("/"));
+
+          if (entriesMap.containsKey(keyName)) {
+            Object value = CrudServiceUtil.validateFieldType(entriesMap.get(keyName).getAsString(), field.getType());
+            modelVertexBuilder.property(keyName, value);
+          }
+        }
+      }
+
+      return modelVertexBuilder.build();
+    } catch (Exception e) {
+      throw new CrudException(e.getMessage(), Status.BAD_REQUEST);
+    }
+  }
+
+  public static Vertex validateIncomingPatchPayload(String id, String version, String type, JsonElement properties,
+      Vertex existingVertex) throws CrudException {
+
+    try {
+      type = resolveCollectionType(version, type);
+      DynamicJAXBContext jaxbContext = OxmModelLoader.getContextForVersion(version);
+      String modelObjectClass = CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL,
+          CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, type));
+
+      final DynamicType modelObjectType = jaxbContext.getDynamicType(modelObjectClass);
+      final DynamicType reservedType = jaxbContext.getDynamicType("ReservedPropNames");
+
+      Set<Map.Entry<String, JsonElement>> payloadEntriesSet = properties.getAsJsonObject().entrySet();
+
+      // Loop through the payload properties and merge with existing
+      // vertex props
+      for (Map.Entry<String, JsonElement> entry : payloadEntriesSet) {
+
+        String keyJavaName = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, entry.getKey());
+
+        DatabaseField field = null;
+        String defaultValue = null;
+
+        if (modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName) != null) {
+          field = modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName).getField();
+          defaultValue = modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName).getProperties()
+              .get("defaultValue") == null ? ""
+                  : modelObjectType.getDescriptor().getMappingForAttributeName(keyJavaName).getProperties()
+                      .get("defaultValue").toString();
+        } else if (reservedType.getDescriptor().getMappingForAttributeName(keyJavaName) != null) {
+          field = reservedType.getDescriptor().getMappingForAttributeName(keyJavaName).getField();
+          defaultValue = "";
+        }
+
+        if (field == null) {
+          throw new CrudException("Invalid field: " + entry.getKey(), Status.BAD_REQUEST);
+        }
+
+        // check if mandatory field is not set to null
+        if (((XMLField) field).isRequired() && entry.getValue() instanceof JsonNull && !defaultValue.isEmpty()) {
+          existingVertex.getProperties().put(entry.getKey(),
+              CrudServiceUtil.validateFieldType(defaultValue, field.getType()));
+        } else if (((XMLField) field).isRequired() && entry.getValue() instanceof JsonNull && defaultValue.isEmpty()) {
+          throw new CrudException("Mandatory field: " + entry.getKey() + " can't be set to null", Status.BAD_REQUEST);
+        } else if (!((XMLField) field).isRequired() && entry.getValue() instanceof JsonNull
+            && existingVertex.getProperties().containsKey(entry.getKey())) {
+          existingVertex.getProperties().remove(entry.getKey());
+        } else if (!(entry.getValue() instanceof JsonNull)) {
+          // add/update the value if found in existing vertex
+          Object value = CrudServiceUtil.validateFieldType(entry.getValue().getAsString(), field.getType());
+          existingVertex.getProperties().put(entry.getKey(), value);
+        }
+
+      }
+
+      return existingVertex;
+    } catch (Exception e) {
+      throw new CrudException(e.getMessage(), Status.BAD_REQUEST);
+    }
+
+  }
+
+  private static DatabaseField getDatabaseField(String fieldName, DynamicType modelObjectType) {
+    for (DatabaseField field : modelObjectType.getDescriptor().getAllFields()) {
+      int ix = field.getName().indexOf("/");
+      if (ix <= 0) {
+        ix = field.getName().length();
+      }
+
+      String keyName = field.getName().substring(0, ix);
+      if (fieldName.equals(keyName)) {
+        return field;
+      }
+    }
+    return null;
+  }
+
+  public static Vertex validateOutgoingPayload(String version, Vertex vertex) {
+
+    Vertex.Builder modelVertexBuilder = new Vertex.Builder(vertex.getType()).id(vertex.getId().get());
+
+    try {
+      DynamicJAXBContext jaxbContext = OxmModelLoader.getContextForVersion(version);
+      String modelObjectClass = CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_CAMEL,
+          CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL,
+              vertex.getProperties().get(Metadata.NODE_TYPE.propertyName()) != null
+                  ? vertex.getProperties().get(Metadata.NODE_TYPE.propertyName()).toString() : vertex.getType()));
+      final DynamicType modelObjectType = jaxbContext.getDynamicType(modelObjectClass);
+
+      for (String key : vertex.getProperties().keySet()) {
+        DatabaseField field = getDatabaseField(key, modelObjectType);
+        if (field != null) {
+          if (!Metadata.isProperty(key)) {
+            modelVertexBuilder.property(key, vertex.getProperties().get(key));
+          }
+        }
+      }
+      return modelVertexBuilder.build();
+    } catch (Exception ex) {
+      return vertex;
+    }
+
+  }
+
+}
diff --git a/src/main/java/org/onap/schema/RelationshipSchema.java b/src/main/java/org/onap/schema/RelationshipSchema.java
new file mode 100644
index 0000000..e6a40b5
--- /dev/null
+++ b/src/main/java/org/onap/schema/RelationshipSchema.java
@@ -0,0 +1,108 @@
+/**
+ * ============LICENSE_START=======================================================
+ * Gizmo
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.schema;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import org.codehaus.jackson.map.ObjectMapper;
+import org.onap.crud.exception.CrudException;
+
+import java.io.IOException;
+import java.util.*;
+import java.util.stream.Collectors;
+import javax.ws.rs.core.Response.Status;
+
+
+public class RelationshipSchema {
+  private static final Gson gson = new GsonBuilder().create();
+
+  public static final String SCHEMA_SOURCE_NODE_TYPE = "from";
+  public static final String SCHEMA_TARGET_NODE_TYPE = "to";
+  public static final String SCHEMA_RELATIONSHIP_TYPE = "label";
+  public static final String SCHEMA_RULES_ARRAY = "rules";
+
+
+  private Map<String, Map<String, Class<?>>> relations = new HashMap<>();
+  /**
+   * Hashmap of valid relationship types along with properties.
+   */
+  private Map<String, Map<String, Class<?>>> relationTypes  = new HashMap<>();
+
+
+  public RelationshipSchema(List<String> jsonStrings) throws CrudException, IOException {
+    String edgeRules = jsonStrings.get(0);
+    String props = jsonStrings.get(1);
+
+    HashMap<String, ArrayList<LinkedHashMap<String, String>>> rules = new ObjectMapper().readValue(edgeRules, HashMap.class);
+    HashMap<String, String> properties = new ObjectMapper().readValue(props, HashMap.class);
+    Map<String, Class<?>> edgeProps = properties.entrySet().stream().collect(Collectors.toMap(p -> p.getKey(), p -> {
+      try {
+        return resolveClass(p.getValue());
+      } catch (CrudException | ClassNotFoundException e) {
+        e.printStackTrace();
+      }
+      return null;
+    }));
+
+    rules.get(SCHEMA_RULES_ARRAY).forEach(l -> {
+      relationTypes.put(l.get(SCHEMA_RELATIONSHIP_TYPE), edgeProps);
+      relations.put(buildRelation(l.get(SCHEMA_SOURCE_NODE_TYPE), l.get(SCHEMA_TARGET_NODE_TYPE), l.get(SCHEMA_RELATIONSHIP_TYPE)), edgeProps);
+    });
+  }
+
+
+
+  public Map<String, Class<?>> lookupRelation(String key) {
+    return this.relations.get(key);
+  }
+
+  public Map<String, Class<?>> lookupRelationType(String type) {
+    return this.relationTypes.get(type);
+  }
+
+  public boolean isValidType(String type) {
+    return relationTypes.containsKey(type);
+  }
+
+
+  private String buildRelation(String source, String target, String relation){
+    return source + ":" + target + ":" + relation;
+  }
+
+  private Class<?> resolveClass(String type) throws CrudException, ClassNotFoundException {
+    Class<?> clazz = Class.forName(type);
+    validateClassTypes(clazz);
+    return clazz;
+  }
+
+  private void validateClassTypes(Class<?> clazz) throws CrudException {
+    if (!clazz.isAssignableFrom(Integer.class) && !clazz.isAssignableFrom(Double.class)
+            && !clazz.isAssignableFrom(Boolean.class) && !clazz.isAssignableFrom(String.class)) {
+      throw new CrudException("", Status.BAD_REQUEST);
+    }
+  }
+}
+
+
diff --git a/src/main/java/org/onap/schema/RelationshipSchemaLoader.java b/src/main/java/org/onap/schema/RelationshipSchemaLoader.java
new file mode 100644
index 0000000..48727a0
--- /dev/null
+++ b/src/main/java/org/onap/schema/RelationshipSchemaLoader.java
@@ -0,0 +1,263 @@
+/**
+ * ============LICENSE_START=======================================================
+ * Gizmo
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.schema;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.SortedSet;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.TreeSet;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import javax.ws.rs.core.Response.Status;
+
+import org.apache.commons.io.IOUtils;
+import org.onap.aai.cl.eelf.LoggerFactory;
+import org.onap.crud.exception.CrudException;
+import org.onap.crud.logging.CrudServiceMsgs;
+import org.onap.crud.util.CrudServiceConstants;
+import org.onap.crud.util.FileWatcher;
+import org.springframework.core.io.UrlResource;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.core.io.support.ResourcePatternResolver;
+
+public class RelationshipSchemaLoader {
+
+  private static Map<String, RelationshipSchema> versionContextMap = new ConcurrentHashMap<>();
+  private static SortedSet<Integer> versions = new TreeSet<Integer>();
+  private static Map<String, Timer> timers = new ConcurrentHashMap<String, Timer>();
+  final static String edgePropsFiles = "edge_properties_";
+  final static String fileExt = ".json";
+  final static Pattern rulesFilePattern = Pattern.compile("DbEdgeRules(.*)" + fileExt);
+  final static Pattern propsFilePattern = Pattern.compile(edgePropsFiles + "(.*)" + fileExt);
+  final static Pattern versionPattern = Pattern.compile(".*(v\\d+)" + fileExt);
+
+  private static org.onap.aai.cl.api.Logger logger = LoggerFactory.getInstance()
+      .getLogger(RelationshipSchemaLoader.class.getName());
+
+  public synchronized static void loadModels() throws CrudException {
+    load(rulesFilePattern, propsFilePattern);
+  }
+
+  public synchronized static void loadModels(String version) throws CrudException {
+    String pattern = String.format(".*(%s)" + fileExt, version);
+    load(Pattern.compile(pattern), Pattern.compile(edgePropsFiles + version + fileExt));
+  }
+
+  public static RelationshipSchema getSchemaForVersion(String version) throws CrudException {
+    if (versionContextMap == null || versionContextMap.isEmpty()) {
+      loadModels();
+    } else if (!versionContextMap.containsKey(version)) {
+      try {
+        loadModels(version);
+      } catch (Exception e) {
+        throw new CrudException("", Status.NOT_FOUND);
+      }
+    }
+    RelationshipSchema schema = versionContextMap.get(version);
+    if (schema == null) {
+      throw new CrudException("", Status.NOT_FOUND);
+    } else
+      return schema;
+  }
+
+  public static String getLatestSchemaVersion() throws CrudException {
+    return "v" + versions.last();
+  }
+
+  public static Map<String, RelationshipSchema> getVersionContextMap() {
+    return versionContextMap;
+  }
+
+  public static void setVersionContextMap(Map<String, RelationshipSchema> versionContextMap) {
+    RelationshipSchemaLoader.versionContextMap = versionContextMap;
+  }
+
+  public static void resetVersionContextMap() {
+    RelationshipSchemaLoader.versionContextMap = new ConcurrentHashMap<>();
+  }
+
+  private static void load(Pattern rulesPattern, Pattern edgePropsPattern) throws CrudException {
+    ClassLoader cl = RelationshipSchemaLoader.class.getClassLoader();
+    ResourcePatternResolver rulesResolver = new PathMatchingResourcePatternResolver(cl);
+    List<Object> rulesFiles;
+    String rulesDir = CrudServiceConstants.CRD_HOME_MODEL;
+    try {
+
+      // getResources method returns objects of type "Resource"
+      // 1. We are getting all the objects from the classpath which has
+      // "DbEdgeRules" in the name.
+      // 2. We run them through a filter and return only the objects which match
+      // the supplied pattern "p"
+      // 3. We then collect the objects in a list. At this point we have a list
+      // of the kind of files we require.
+      rulesFiles = Arrays.stream(rulesResolver.getResources("classpath*:/dbedgerules/DbEdgeRules*" + fileExt))
+          .filter(r -> !myMatcher(rulesPattern, r.getFilename()).isEmpty()).collect(Collectors.toList());
+
+      // This gets all the objects of type "File" from external directory (not
+      // on the classpath)
+      // 1. From an external directory (one not on the classpath) we get all the
+      // objects of type "File"
+      // 2. We only return the files whose names matched the supplied pattern
+      // "p2".
+      // 3. We then collect all the objects in a list and add the contents of
+      // this list
+      // to the previous collection (rulesFiles)
+      rulesFiles
+          .addAll(Arrays.stream(new File(rulesDir).listFiles((d, name) -> edgePropsPattern.matcher(name).matches()))
+              .collect(Collectors.toList()));
+
+      if (rulesFiles.isEmpty()) {
+        logger.error(CrudServiceMsgs.INVALID_OXM_DIR, rulesDir);
+        throw new FileNotFoundException("DbEdgeRules and edge_properties files were not found.");
+      }
+
+      // Sort and then group the files with their versions, convert them to the
+      // schema, and add them to versionContextMap
+      // 1. Sort the files. We need the DbEdgeRules files to be before the
+      // edgeProperties files.
+      // 2. Group the files with their versions. ie. v11 ->
+      // ["DbEdgeRule_v11.json", "edgeProperties_v11.json"].
+      // The "group method" returns a HashMap whose key is the version and the
+      // value is a list of objects.
+      // 3. Go through each version and map the files into one schema using the
+      // "jsonFilesLoader" method.
+      // Also update the "versionContextMap" with the version and it's schema.
+      rulesFiles.stream().sorted(Comparator.comparing(RelationshipSchemaLoader::filename))
+          .collect(Collectors.groupingBy(f -> myMatcher(versionPattern, filename(f))))
+          .forEach((version, resourceAndFile) -> {
+            if (resourceAndFile.size() == 2) {
+              versionContextMap.put(version, jsonFilesLoader(version, resourceAndFile));
+            } else {
+              String filenames = resourceAndFile.stream().map(f -> filename(f)).collect(Collectors.toList()).toString();
+              String errorMsg = "Expecting a rules and a edge_properties files for " + version + ". Found: "
+                  + filenames;
+              logger.warn(CrudServiceMsgs.INVALID_OXM_FILE, errorMsg);
+            }
+          });
+      logger.info(CrudServiceMsgs.LOADED_OXM_FILE, "Relationship Schema and Properties files: "
+          + rulesFiles.stream().map(f -> filename(f)).collect(Collectors.toList()));
+    } catch (IOException e) {
+      logger.error(CrudServiceMsgs.INVALID_OXM_DIR, rulesDir);
+      throw new CrudException("DbEdgeRules or edge_properties files were not found.", new FileNotFoundException());
+    }
+  }
+
+  private static String filename(Object k) throws ClassCastException {
+    if (k instanceof UrlResource) {
+      return ((UrlResource) k).getFilename();
+    } else if (k instanceof File) {
+      return ((File) k).getName();
+    } else {
+      throw new ClassCastException();
+    }
+  }
+
+  private static RelationshipSchema jsonFilesLoader(String version, List<Object> files) {
+    List<String> fileContents = new ArrayList<>();
+    RelationshipSchema rsSchema = null;
+    if (files.size() == 2) {
+      for (Object file : files) {
+        fileContents.add(jsonToRelationSchema(version, file));
+        versions.add(Integer.parseInt(version.substring(1)));
+      }
+
+      try {
+        rsSchema = new RelationshipSchema(fileContents);
+      } catch (CrudException | IOException e) {
+        e.printStackTrace();
+        logger.error(CrudServiceMsgs.INVALID_OXM_FILE,
+            files.stream().map(f -> filename(f)).collect(Collectors.toList()).toString(), e.getMessage());
+      }
+      return rsSchema;
+    }
+    return rsSchema;
+  }
+
+  private synchronized static void updateVersionContext(String version, RelationshipSchema rs) {
+    versionContextMap.put(version, rs);
+  }
+
+  private synchronized static String jsonToRelationSchema(String version, Object file) {
+    InputStream inputStream = null;
+    String content = null;
+
+    try {
+      if (file instanceof UrlResource) {
+        inputStream = ((UrlResource) file).getInputStream();
+      } else {
+        inputStream = new FileInputStream((File) file);
+        addtimer(version, file);
+      }
+      content = IOUtils.toString(inputStream, "UTF-8");
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+    return content;
+  }
+
+  private static void addtimer(String version, Object file) {
+    TimerTask task = null;
+    task = new FileWatcher((File) file) {
+      protected void onChange(File file) {
+        // here we implement the onChange
+        logger.info(CrudServiceMsgs.OXM_FILE_CHANGED, file.getName());
+
+        try {
+          // Cannot use the file object here because we also have to get the
+          // edge properties associated with that version.
+          // The properties are stored in a different file.
+          RelationshipSchemaLoader.loadModels(version);
+        } catch (Exception e) {
+          e.printStackTrace();
+        }
+      }
+    };
+
+    if (!timers.containsKey(version)) {
+      Timer timer = new Timer("db_edge_rules_" + version);
+      timer.schedule(task, new Date(), 10000);
+      timers.put(version, timer);
+
+    }
+  }
+
+  private static String myMatcher(Pattern p, String s) {
+    Matcher m = p.matcher(s);
+    return m.matches() ? m.group(1) : "";
+  }
+}
diff --git a/src/main/java/org/onap/schema/RelationshipSchemaValidator.java b/src/main/java/org/onap/schema/RelationshipSchemaValidator.java
new file mode 100644
index 0000000..53048be
--- /dev/null
+++ b/src/main/java/org/onap/schema/RelationshipSchemaValidator.java
@@ -0,0 +1,352 @@
+/**
+ * ============LICENSE_START=======================================================
+ * Gizmo
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.schema;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+
+import org.onap.crud.entity.Edge;
+import org.onap.crud.entity.Vertex;
+import org.onap.crud.exception.CrudException;
+import org.onap.crud.service.EdgePayload;
+import org.onap.crud.util.CrudServiceUtil;
+import org.radeox.util.logging.Logger;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.ws.rs.core.Response.Status;
+
+public class RelationshipSchemaValidator {
+
+  public static final String SOURCE_NODE = "source";
+  public static final String TARGET_NODE = "target";
+
+  final static Pattern urlPattern = Pattern.compile("services/inventory/(.*)/(.*)/(.*)");
+
+  public static Map<String, Object> resolveCollectionfilter(String version, String type,
+                                                            Map<String, String> filter)
+      throws CrudException {
+
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+    if (schema == null) {
+      throw new CrudException("", Status.NOT_FOUND);
+    }
+
+    Map<String, Class<?>> props = schema.lookupRelationType(type);
+    Map<String, Object> result = new HashMap<String, Object>();
+
+    for (String key : filter.keySet()) {
+
+      if (props.containsKey(key)) {
+        try {
+          Object value = CrudServiceUtil.validateFieldType(filter.get(key), props.get(key));
+          result.put(key, value);
+        } catch (Exception ex) {
+          // Skip any exceptions thrown while validating the filter
+          // key value
+          continue;
+        }
+      }
+    }
+
+    return result;
+
+  }
+
+  public static void validateType(String version, String type) throws CrudException {
+
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+    if (!schema.isValidType(type)) {
+      throw new CrudException("Invalid " + RelationshipSchema.SCHEMA_RELATIONSHIP_TYPE
+          + ": " + type,
+          Status.BAD_REQUEST);
+    }
+
+  }
+
+  public static Edge validateIncomingAddPayload(String version, String type, Vertex sourceNode,
+                                                Vertex targetNode, JsonElement properties)
+      throws CrudException {
+    EdgePayload payload = new EdgePayload();
+    payload.setSource("services/inventory/" + version + "/" + sourceNode.getType()
+        + "/" + sourceNode.getId().get());
+    payload.setTarget("services/inventory/" + version + "/" + targetNode.getType()
+        + "/" + targetNode.getId().get());
+    payload.setType(type);
+    payload.setProperties(properties);
+    return validateIncomingAddPayload(version, type, payload);
+  }
+
+  public static Edge validateIncomingAddPayload(String version, String type, EdgePayload payload)
+      throws CrudException {
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+
+    try {
+
+      if (payload.getSource() == null || payload.getTarget() == null) {
+        throw new CrudException("Source/Target not specified", Status.BAD_REQUEST);
+      }
+
+      Matcher sourceMatcher = urlPattern.matcher(payload.getSource());
+      Matcher targetMatcher = urlPattern.matcher(payload.getTarget());
+
+      if (!sourceMatcher.matches() || !targetMatcher.matches()) {
+        throw new CrudException("Invalid Source/Target Urls", Status.BAD_REQUEST);
+      }
+
+      // create key based on source:target:relationshipType
+      String sourceNodeType = sourceMatcher.group(2);
+      String targetNodeType = targetMatcher.group(2);
+
+      String sourceNodeId = sourceMatcher.group(3);
+      String targetNodeId = targetMatcher.group(3);
+
+      String key = sourceNodeType + ":" + targetNodeType + ":" + type;
+
+      // find the validate the key from the schema
+      Map<String, Class<?>> schemaObject = schema.lookupRelation(key);
+
+      if (schemaObject == null) {
+        throw new CrudException("Invalid source/target/relationship type: " + key,
+            Status.BAD_REQUEST);
+      }
+
+      Edge.Builder modelEdgeBuilder = new Edge.Builder(type);
+
+      modelEdgeBuilder.source(new Vertex.Builder(sourceNodeType).id(sourceNodeId).build());
+      modelEdgeBuilder.target(new Vertex.Builder(targetNodeType).id(targetNodeId).build());
+
+      // validate it properties
+      validateEdgeProps(modelEdgeBuilder, payload.getProperties(), schemaObject);
+
+      return modelEdgeBuilder.build();
+    } catch (Exception ex) {
+
+      throw new CrudException(ex.getMessage(), Status.BAD_REQUEST);
+    }
+
+  }
+
+  public static Edge validateIncomingPatchPayload(Edge edge, String version, EdgePayload payload)
+      throws CrudException {
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+
+    try {
+      if (payload.getSource() != null) {
+        Matcher sourceMatcher = urlPattern.matcher(payload.getSource());
+
+        if (!sourceMatcher.matches()) {
+          throw new CrudException("Invalid Target Urls", Status.BAD_REQUEST);
+        }
+        String sourceNodeId = sourceMatcher.group(3);
+        if (!sourceNodeId.equals(edge.getSource().getId().get())) {
+          throw new CrudException("Source can't be updated", Status.BAD_REQUEST);
+        }
+      }
+
+      if (payload.getTarget() != null) {
+        Matcher targetMatcher = urlPattern.matcher(payload.getTarget());
+
+        if (!targetMatcher.matches()) {
+          throw new CrudException("Invalid Target Urls", Status.BAD_REQUEST);
+        }
+        String sourceNodeId = targetMatcher.group(3);
+        if (!sourceNodeId.equals(edge.getTarget().getId().get())) {
+          throw new CrudException("Target can't be updated", Status.BAD_REQUEST);
+        }
+      }
+      // create key based on source:target:relationshipType
+
+      String key = edge.getSource().getType() + ":" + edge.getTarget().getType()
+          + ":" + edge.getType();
+
+      // find the validate the key from the schema
+      Map<String, Class<?>> schemaObject = schema.lookupRelation(key);
+
+      if (schemaObject == null) {
+        Logger.warn("key :" + key
+            + " not found in relationship schema . Skipping the schema validation");
+        return edge;
+      }
+
+      Set<Map.Entry<String, JsonElement>> entries = payload.getProperties()
+          .getAsJsonObject().entrySet();
+
+      for (Map.Entry<String, JsonElement> entry : entries) {
+
+        if (!schemaObject.containsKey(entry.getKey())) {
+          throw new CrudException("Invalid property: " + entry.getKey(), Status.BAD_REQUEST);
+        } else if (entry.getValue() instanceof JsonNull && edge.getProperties()
+            .containsKey(entry.getKey())) {
+          edge.getProperties().remove(entry.getKey());
+        } else if (!(entry.getValue() instanceof JsonNull)) {
+          Object value = CrudServiceUtil.validateFieldType(entry.getValue().getAsString(),
+              schemaObject.get(entry.getKey()));
+          edge.getProperties().put(entry.getKey(), value);
+        }
+
+      }
+
+      return edge;
+
+    } catch (Exception ex) {
+
+      throw new CrudException(ex.getMessage(), Status.BAD_REQUEST);
+    }
+  }
+
+  public static Edge validateIncomingUpdatePayload(Edge edge, String version, Vertex sourceNode,
+                                                   Vertex targetNode, JsonElement properties)
+      throws CrudException {
+    EdgePayload payload = new EdgePayload();
+    payload.setSource("services/inventory/" + version + "/" + sourceNode.getType()
+        + "/" + sourceNode.getId().get());
+    payload.setTarget("services/inventory/" + version + "/" + targetNode.getType()
+        + "/" + targetNode.getId().get());
+    payload.setType(edge.getType());
+    payload.setProperties(properties);
+    return validateIncomingUpdatePayload(edge, version, payload);
+  }
+
+  public static Edge validateIncomingUpdatePayload(Edge edge, String version, EdgePayload payload)
+      throws CrudException {
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+
+    try {
+
+      if (payload.getSource() != null) {
+        Matcher sourceMatcher = urlPattern.matcher(payload.getSource());
+
+        if (!sourceMatcher.matches()) {
+          throw new CrudException("Invalid Target Urls", Status.BAD_REQUEST);
+        }
+        String sourceNodeId = sourceMatcher.group(3);
+        if (!sourceNodeId.equals(edge.getSource().getId().get())) {
+          throw new CrudException("Source can't be updated", Status.BAD_REQUEST);
+        }
+      }
+
+      if (payload.getTarget() != null) {
+        Matcher targetMatcher = urlPattern.matcher(payload.getTarget());
+
+        if (!targetMatcher.matches()) {
+          throw new CrudException("Invalid Target Urls", Status.BAD_REQUEST);
+        }
+        String sourceNodeId = targetMatcher.group(3);
+        if (!sourceNodeId.equals(edge.getTarget().getId().get())) {
+          throw new CrudException("Target can't be updated", Status.BAD_REQUEST);
+        }
+      }
+      // create key based on source:target:relationshipType
+
+      String key = edge.getSource().getType() + ":" + edge.getTarget().getType()
+          + ":" + edge.getType();
+
+      // find the validate the key from the schema
+      Map<String, Class<?>> schemaObject = schema.lookupRelation(key);
+
+      if (schemaObject == null) {
+        Logger.warn("key :" + key
+            + " not found in relationship schema . Skipping the schema validation");
+        return edge;
+      }
+
+      Edge.Builder updatedEdgeBuilder = new Edge.Builder(edge.getType()).id(edge.getId().get());
+
+      updatedEdgeBuilder
+          .source(new Vertex.Builder(edge.getSource().getType()).id(edge.getSource().getId()
+              .get()).build());
+      updatedEdgeBuilder
+          .target(new Vertex.Builder(edge.getTarget().getType()).id(edge.getTarget().getId()
+              .get()).build());
+
+      validateEdgeProps(updatedEdgeBuilder, payload.getProperties(), schemaObject);
+
+      return updatedEdgeBuilder.build();
+    } catch (Exception ex) {
+
+      throw new CrudException(ex.getMessage(), Status.BAD_REQUEST);
+    }
+  }
+
+
+  private static void validateEdgeProps(Edge.Builder builder, JsonElement props,
+                                        Map<String, Class<?>> schemaObject)
+      throws CrudException {
+    Set<Map.Entry<String, JsonElement>> entries = props.getAsJsonObject().entrySet();
+
+    for (Map.Entry<String, JsonElement> entry : entries) {
+
+      if (!schemaObject.containsKey(entry.getKey())) {
+        throw new CrudException("Invalid property: " + entry.getKey(), Status.BAD_REQUEST);
+      } else {
+        Object value = CrudServiceUtil.validateFieldType(entry.getValue().getAsString(),
+            schemaObject.get(entry.getKey()));
+        builder.property(entry.getKey(), value);
+      }
+
+    }
+
+  }
+
+  public static Edge validateOutgoingPayload(String version, Edge edge) throws CrudException {
+
+    Edge.Builder modelEdgeBuilder = new Edge.Builder(edge.getType()).id(edge.getId()
+        .get()).source(edge.getSource())
+        .target(edge.getTarget());
+
+    RelationshipSchema schema = RelationshipSchemaLoader.getSchemaForVersion(version);
+
+    String key = edge.getSource().getType() + ":" + edge.getTarget().getType()
+        + ":" + edge.getType();
+    Map<String, Class<?>> schemaObject = schema.lookupRelation(key);
+
+    if (schemaObject == null || schemaObject.isEmpty()) {
+      return edge;
+    }
+
+    for (String prop : edge.getProperties().keySet()) {
+      if (schemaObject.containsKey(prop)) {
+        modelEdgeBuilder.property(prop, edge.getProperties().get(prop));
+      }
+
+    }
+    return modelEdgeBuilder.build();
+  }
+
+    
+  public static String vertexTypeFromUri(String uri) throws CrudException {
+      
+    Matcher matcher = urlPattern.matcher(uri);
+
+    if (!matcher.matches()) {
+      throw new CrudException("Invalid Source/Target Urls", Status.BAD_REQUEST);
+    }
+
+    return matcher.group(2);
+  }
+}