Adding purge-intents command

Change-Id: I991084aa610cdeb9fb43082ed1e9888b781897ce

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.cli.net;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentService;
+
+import static org.onosproject.net.intent.IntentState.WITHDRAWN;
+
+/**
+ * Purges all WITHDRAWN intents.
+ */
+@Command(scope = "onos", name = "purge-intents",
+         description = "Purges all WITHDRAWN intents")
+public class IntentPurgeCommand extends AbstractShellCommand {
+    @Override
+    protected void execute() {
+        IntentService intentService = get(IntentService.class);
+        for (Intent intent: intentService.getIntents()) {
+            if (intentService.getIntentState(intent.key()) == WITHDRAWN) {
+                intentService.purge(intent);
+            }
+        }
+    }
+}

@@ -137,6 +137,9 @@
             </completers>
         </command>
         <command>
+            <action class="org.onosproject.cli.net.IntentPurgeCommand"/>
+        </command>
+        <command>
             <action class="org.onosproject.cli.net.AddHostToHostIntentCommand"/>
             <completers>
                 <ref component-id="hostIdCompleter"/>