Route reprogamming using group substitution during next hop movement

Change-Id: Idf8362dac522722ca67747e245bfd836e6ee6292
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/NextMacVlanCommand.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/NextMacVlanCommand.java
new file mode 100644
index 0000000..e31e693
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/cli/NextMacVlanCommand.java
@@ -0,0 +1,59 @@
+/*
+ * 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.cli;
+
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.segmentrouting.SegmentRoutingService;
+import org.onosproject.segmentrouting.storekey.MacVlanNextObjectiveStoreKey;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.Map;
+
+/**
+ * Command to read the current state of the macVlanNextObjStore.
+ */
+@Service
+@Command(scope = "onos", name = "sr-next-mac-vlan",
+        description = "Displays the current next-hop / next-id it mapping")
+public class NextMacVlanCommand extends AbstractShellCommand {
+    @Override
+    protected void doExecute() {
+        SegmentRoutingService srService =
+                AbstractShellCommand.get(SegmentRoutingService.class);
+        print(srService.getMacVlanNextObjStore());
+    }
+
+    private void print(Map<MacVlanNextObjectiveStoreKey, Integer> macVlanNextObjStore) {
+        ArrayList<MacVlanNextObjectiveStoreKey> a = new ArrayList<>(macVlanNextObjStore.keySet());
+        a.sort(Comparator
+                .comparing((MacVlanNextObjectiveStoreKey o) -> o.deviceId().toString())
+                .thenComparing((MacVlanNextObjectiveStoreKey o) -> o.vlanId().toString())
+                .thenComparing((MacVlanNextObjectiveStoreKey o) -> o.macAddr().toString()));
+
+        StringBuilder builder = new StringBuilder();
+        a.forEach(k ->
+            builder.append("\n")
+                    .append(k)
+                    .append(" --> ")
+                    .append(macVlanNextObjStore.get(k))
+        );
+        print(builder.toString());
+    }
+}