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diff --git a/src/main/java/org/onap/crud/service/AbstractGraphDataService.java b/src/main/java/org/onap/crud/service/AbstractGraphDataService.java
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+/**
+ * ============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.crud.service;
+
+import java.util.List;
+import java.util.Map;
+
+import org.onap.crud.dao.GraphDao;
+import org.onap.crud.entity.Edge;
+import org.onap.crud.entity.Vertex;
+import org.onap.crud.exception.CrudException;
+import org.onap.crud.parser.CrudResponseBuilder;
+import org.onap.crud.util.CrudServiceUtil;
+import org.onap.schema.OxmModelValidator;
+import org.onap.schema.RelationshipSchemaValidator;
+
+public abstract class AbstractGraphDataService {
+  protected GraphDao dao;
+  
+  public AbstractGraphDataService(GraphDao dao) throws CrudException {
+    this.dao = dao;
+
+    CrudServiceUtil.loadModels();
+  }
+  
+  public String getEdge(String version, String id, String type) throws CrudException {
+    RelationshipSchemaValidator.validateType(version, type);
+    Edge edge = dao.getEdge(id, type);
+
+    return CrudResponseBuilder.buildGetEdgeResponse(RelationshipSchemaValidator.validateOutgoingPayload(version, edge), version);
+  }
+  
+  public String getEdges(String version, String type, Map<String, String> filter) throws CrudException {
+    RelationshipSchemaValidator.validateType(version, type);
+    List<Edge> items = dao.getEdges(type, RelationshipSchemaValidator.resolveCollectionfilter(version, type, filter));
+    return CrudResponseBuilder.buildGetEdgesResponse(items, version);
+  }
+  
+  public String getVertex(String version, String id, String type) throws CrudException {
+    type = OxmModelValidator.resolveCollectionType(version, type);
+    Vertex vertex = dao.getVertex(id, type);
+    List<Edge> edges = dao.getVertexEdges(id);
+    return CrudResponseBuilder.buildGetVertexResponse(OxmModelValidator.validateOutgoingPayload(version, vertex), edges,
+        version);
+  }
+
+  public String getVertices(String version, String type, Map<String, String> filter) throws CrudException {
+    type = OxmModelValidator.resolveCollectionType(version, type);
+    List<Vertex> items = dao.getVertices(type, OxmModelValidator.resolveCollectionfilter(version, type, filter));
+    return CrudResponseBuilder.buildGetVerticesResponse(items, version);
+  }
+  
+  public abstract String addVertex(String version, String type, VertexPayload payload) throws CrudException;
+  public abstract String updateVertex(String version, String id, String type, VertexPayload payload) throws CrudException;
+  public abstract String patchVertex(String version, String id, String type, VertexPayload payload) throws CrudException;
+  public abstract String deleteVertex(String version, String id, String type) throws CrudException;
+  public abstract String addEdge(String version, String type, EdgePayload payload) throws CrudException;
+  public abstract String deleteEdge(String version, String id, String type) throws CrudException;
+  public abstract String updateEdge(String version, String id, String type, EdgePayload payload) throws CrudException;
+  public abstract String patchEdge(String version, String id, String type, EdgePayload payload) throws CrudException;
+  public abstract String addBulk(String version, BulkPayload payload) throws CrudException;
+}