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/XconnectService.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
new file mode 100644
index 0000000..1fede71
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
@@ -0,0 +1,74 @@
+/*
+ * 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 org.apache.felix.scr.annotations.Service;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+
+import java.util.Set;
+
+/**
+ * VLAN cross connect between exactly two ports.
+ */
+@Service
+public interface XconnectService {
+
+    /**
+     * VLAN cross-connect ACL priority.
+     */
+    int XCONNECT_ACL_PRIORITY = 60000;
+
+    /**
+     * VLAN cross-connect Bridging priority.
+     */
+    int XCONNECT_PRIORITY = 1000;
+
+    /**
+     * Creates or updates Xconnect.
+     *
+     * @param deviceId device ID
+     * @param vlanId VLAN ID
+     * @param ports set of ports
+     */
+    void addOrUpdateXconnect(DeviceId deviceId, VlanId vlanId, Set<PortNumber> ports);
+
+    /**
+     * Deletes Xconnect.
+     *
+     * @param deviceId device ID
+     * @param vlanId VLAN ID
+     */
+    void removeXonnect(DeviceId deviceId, VlanId vlanId);
+
+    /**
+     * Gets Xconnects.
+     *
+     * @return set of Xconnect descriptions
+     */
+    Set<XconnectDesc> getXconnects();
+
+    /**
+     * Check if there is Xconnect configured on given connect point.
+     *
+     * @param cp connect point
+     * @return true if there is Xconnect configured on the connect point
+     */
+    boolean hasXconnect(ConnectPoint cp);
+
+}