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/XconnectCodec.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java
new file mode 100644
index 0000000..77824e8
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java
@@ -0,0 +1,64 @@
+/*
+ * 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.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Sets;
+import org.onlab.packet.VlanId;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Set;
+
+public class XconnectCodec extends JsonCodec<XconnectDesc> {
+    private static final String DEVICE_ID = "deviceId";
+    private static final String VLAN_ID = "vlanId";
+    private static final String PORTS = "ports";
+
+    private static Logger log = LoggerFactory.getLogger(XconnectCodec.class);
+
+    @Override
+    public ObjectNode encode(XconnectDesc desc, CodecContext context) {
+        final ObjectNode result = context.mapper().createObjectNode();
+        result.put(DEVICE_ID, desc.key().deviceId().toString());
+        result.put(VLAN_ID, desc.key().vlanId().toString());
+        final ArrayNode portNode = result.putArray(PORTS);
+        desc.ports().forEach(port -> portNode.add(port.toString()));
+
+        return result;
+    }
+
+    @Override
+    public XconnectDesc decode(ObjectNode json, CodecContext context) {
+        DeviceId deviceId = DeviceId.deviceId(json.path(DEVICE_ID).asText());
+        VlanId vlanId = VlanId.vlanId(json.path(VLAN_ID).asText());
+
+        Set<PortNumber> ports = Sets.newHashSet();
+        JsonNode portNodes = json.get(PORTS);
+        if (portNodes != null) {
+            portNodes.forEach(portNode -> ports.add(PortNumber.portNumber(portNode.asInt())));
+        }
+
+        XconnectKey key = new XconnectKey(deviceId, vlanId);
+        return new XconnectDesc(key, ports);
+    }
+}