Implement CLI and REST API for Xconnect

Deprecate the old way of configuring Xconnect via network config

Change-Id: I5b9ac7852517c25805bcbfc0e7b3bec3a52eed9f
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectKey.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectKey.java
new file mode 100644
index 0000000..1f2d446
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectKey.java
@@ -0,0 +1,88 @@
+/*
+ * 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.segmentrouting.xconnect.api;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.DeviceId;
+
+import java.util.Objects;
+
+/**
+ * Xconnect key.
+ */
+public class XconnectKey {
+    private DeviceId deviceId;
+    private VlanId vlanId;
+
+    /**
+     * Constructs new XconnectKey with given device ID and VLAN ID.
+     *
+     * @param deviceId device ID
+     * @param vlanId vlan ID
+     */
+    public XconnectKey(DeviceId deviceId, VlanId vlanId) {
+        this.deviceId = deviceId;
+        this.vlanId = vlanId;
+    }
+
+    /**
+     * Gets device ID.
+     *
+     * @return device ID of the Xconnect key
+     */
+    public DeviceId deviceId() {
+        return deviceId;
+    }
+
+    /**
+     * Gets VLAN ID.
+     *
+     * @return VLAN ID of the Xconnect key
+     */
+    public VlanId vlanId() {
+        return vlanId;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!super.equals(obj)) {
+            return false;
+        }
+        if (!(obj instanceof XconnectKey)) {
+            return false;
+        }
+        final XconnectKey other = (XconnectKey) obj;
+        return Objects.equals(this.deviceId, other.deviceId) &&
+                Objects.equals(this.vlanId, other.vlanId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(deviceId, vlanId);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("deviceId", deviceId)
+                .add("vlanId", vlanId)
+                .toString();
+    }
+}