[ONOS-3662] Add CLI for control plane manager

- Implement CLI for enumerating control plane metrics stats
- Implement ControlResourceTypeCompleter
- Implement DiskResourceNameCompleter
- Implement NetworkResourceNameCompleter
- Implement ControlMessageDeviceIdCompleter
- Extract the control resource type and metrics in a separated
  class for the sake of simplicity.

Change-Id: Ic505191a74bd463091b0e5c75e11f1824bafb816
diff --git a/apps/cpman/app/src/main/java/org/onosproject/cpman/cli/ControlMessageDeviceIdCompleter.java b/apps/cpman/app/src/main/java/org/onosproject/cpman/cli/ControlMessageDeviceIdCompleter.java
new file mode 100644
index 0000000..ab063a0
--- /dev/null
+++ b/apps/cpman/app/src/main/java/org/onosproject/cpman/cli/ControlMessageDeviceIdCompleter.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016 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.cpman.cli;
+
+import org.apache.karaf.shell.console.completer.ArgumentCompleter;
+import org.apache.karaf.shell.console.completer.StringsCompleter;
+import org.onosproject.cli.AbstractCompleter;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.cpman.ControlPlaneMonitorService;
+
+import java.util.List;
+import java.util.Set;
+import java.util.SortedSet;
+
+import static org.onosproject.cpman.ControlResource.Type;
+
+/**
+ * Device identification completer for control plane manager.
+ */
+public class ControlMessageDeviceIdCompleter extends AbstractCompleter {
+    @Override
+    public int complete(String buffer, int cursor, List<String> candidates) {
+        // delegate string completer
+        StringsCompleter delegate = new StringsCompleter();
+
+        // Resource type is the second argument.
+        ArgumentCompleter.ArgumentList list = getArgumentList();
+        String type = list.getArguments()[1];
+
+        if (Type.CONTROL_MESSAGE.toString().toLowerCase().equals(type)) {
+            ControlPlaneMonitorService monitorService =
+                    AbstractShellCommand.get(ControlPlaneMonitorService.class);
+
+            Set<String> set = monitorService.availableResources(Type.CONTROL_MESSAGE);
+
+            SortedSet<String> strings = delegate.getStrings();
+            if (set != null) {
+                set.forEach(s -> strings.add(s));
+            }
+        }
+        return delegate.complete(buffer, cursor, candidates);
+    }
+}