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/XconnectDesc.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.java
new file mode 100644
index 0000000..0eead31
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.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.onosproject.net.PortNumber;
+
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * Xconnect description.
+ */
+public class XconnectDesc {
+    private XconnectKey key;
+    private Set<PortNumber> ports;
+
+    /**
+     * Constructs new Xconnect description with given device ID and VLAN ID.
+     *
+     * @param key Xconnect key
+     * @param ports set of ports
+     */
+    public XconnectDesc(XconnectKey key, Set<PortNumber> ports) {
+        this.key = key;
+        this.ports = ports;
+    }
+
+    /**
+     * Gets Xconnect key.
+     *
+     * @return Xconnect key
+     */
+    public XconnectKey key() {
+        return key;
+    }
+
+    /**
+     * Gets ports.
+     *
+     * @return set of ports
+     */
+    public Set<PortNumber> ports() {
+        return ports;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!super.equals(obj)) {
+            return false;
+        }
+        if (!(obj instanceof XconnectDesc)) {
+            return false;
+        }
+        final XconnectDesc other = (XconnectDesc) obj;
+        return Objects.equals(this.key, other.key) &&
+                Objects.equals(this.ports, other.ports);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(key, ports);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("key", key)
+                .add("ports", ports)
+                .toString();
+    }
+}