Implement CLI commands to view and delete SR internal stores

sr-next-dst (renamed from sr-next-hops)
sr-next-port
sr-next-vlan
sr-next-mcast (renamed from sr-mcast-next)
sr-next-pw
sr-next-xconnect
sr-next-invalidate <next-id>

Change-Id: Id5178f786bb97e26ddb86015105dd19604ac0817
diff --git a/app/src/main/java/org/onosproject/segmentrouting/cli/InvalidateNextCommand.java b/app/src/main/java/org/onosproject/segmentrouting/cli/InvalidateNextCommand.java
new file mode 100644
index 0000000..aa3f78b
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/cli/InvalidateNextCommand.java
@@ -0,0 +1,56 @@
+/*
+ * 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.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onlab.osgi.ServiceNotFoundException;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.segmentrouting.SegmentRoutingService;
+
+/**
+ * Command to invalidate next id from SR internal stores.
+ */
+@Command(scope = "onos", name = "sr-next-invalidate",
+        description = "Invalidate given next id from SR internal stores")
+public class InvalidateNextCommand extends AbstractShellCommand {
+
+    private static final String CONFIRM_PHRASE = "please";
+
+    @Argument(name = "nextId", description = "Next ID", index = 0)
+    private String nextId = null;
+
+    @Argument(name = "confirm", description = "Confirmation phrase", index = 1)
+    private String please = null;
+
+    @Override
+    protected void execute() {
+        if (please == null || !please.equals(CONFIRM_PHRASE)) {
+            print("WARNING: System may enter an unpredictable state if the next ID is force invalidated." +
+                    "Enter confirmation phrase to continue.");
+            return;
+        }
+
+        try {
+            SegmentRoutingService srService = AbstractShellCommand.get(SegmentRoutingService.class);
+            srService.invalidateNextObj(Integer.parseInt(nextId));
+        } catch (ServiceNotFoundException e) {
+            print("SegmentRoutingService unavailable");
+        }
+    }
+}