Add Tapi Context/Topology/Node/Link builders and utility class

ONOS-7679

Change-Id: I85f856b11a5e272460b38c16ca46212fb4a0a082
diff --git a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java
new file mode 100644
index 0000000..a28d53d
--- /dev/null
+++ b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+package org.onosproject.odtn.utils.tapi;
+
+import java.util.UUID;
+import org.onosproject.net.ConnectPoint;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Objects.equal;
+import static java.util.Objects.hash;
+
+public class TapiNepRef {
+
+    private final UUID topologyId;
+    private final UUID nodeId;
+    private final UUID nepId;
+    private UUID sipId;
+    private ConnectPoint cp;
+
+    public String getTopologyId() {
+        return topologyId.toString();
+    }
+
+    public String getNodeId() {
+        return nodeId.toString();
+    }
+
+    public String getNepId() {
+        return nepId.toString();
+    }
+
+    public String getSipId() {
+        return sipId.toString();
+    }
+
+    public ConnectPoint getConnectPoint() {
+        return cp;
+    }
+
+    public TapiNepRef setSipId(String sipId) {
+        this.sipId = UUID.fromString(sipId);
+        return this;
+    }
+
+    public TapiNepRef setConnectPoint(ConnectPoint cp) {
+        this.cp = cp;
+        return this;
+    }
+
+    public TapiNepRef(String topologyId, String nodeId, String nepId) {
+        this.topologyId = UUID.fromString(topologyId);
+        this.nodeId = UUID.fromString(nodeId);
+        this.nepId = UUID.fromString(nepId);
+    }
+
+    public String toString() {
+        return toStringHelper(getClass())
+//                .add("topologyId", topologyId)
+                .add("nodeId", nodeId)
+                .add("nepId", nepId)
+                .add("sipId", sipId)
+                .add("connectPoint", cp)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof TapiNepRef)) {
+            return false;
+        }
+        TapiNepRef that = (TapiNepRef) o;
+        return equal(topologyId, that.topologyId) &&
+                equal(nodeId, that.nodeId) &&
+                equal(nepId, that.nepId);
+    }
+
+    @Override
+    public int hashCode() {
+        return hash(topologyId, nodeId, nepId);
+    }
+
+}