ONOS-6159 Add command completers for v-net CLI

Change-Id: Ie048da32cdba6d2e9ed88b6d9d0404749750b0c8
diff --git a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java
new file mode 100644
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+++ b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualDeviceCompleter.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2016-present 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.vnet;
+
+import static org.onlab.osgi.DefaultServiceDirectory.getService;
+
+import org.apache.karaf.shell.console.completer.ArgumentCompleter.ArgumentList;
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.incubator.net.virtual.VirtualDevice;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+import org.onosproject.utils.Comparators;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Virtual device completer.
+ *
+ * Assumes the first argument which can be parsed to a number is network id.
+ */
+public class VirtualDeviceCompleter extends AbstractChoicesCompleter {
+    @Override
+    protected List<String> choices() {
+        ArgumentList args = getArgumentList();
+        //parse argument list for network id
+        String[] argsArray = args.getArguments();
+        for (String str : argsArray) {
+            if (str.matches("[0-9]+")) {
+                long networkId = Long.valueOf(str);
+                return getSortedVirtualDevices(networkId).stream()
+                        .map(virtualDevice -> virtualDevice.id().toString())
+                        .collect(Collectors.toList());
+            }
+        }
+        return Collections.singletonList("Missing network id");
+    }
+
+    /**
+     * Returns the list of virtual devices sorted using the network identifier.
+     *
+     * @param networkId network id
+     * @return sorted virtual device list
+     */
+    private List<VirtualDevice> getSortedVirtualDevices(long networkId) {
+        VirtualNetworkService service = getService(VirtualNetworkService.class);
+
+        List<VirtualDevice> virtualDevices = new ArrayList<>();
+        virtualDevices.addAll(service.getVirtualDevices(NetworkId.networkId(networkId)));
+        Collections.sort(virtualDevices, Comparators.VIRTUAL_DEVICE_COMPARATOR);
+        return virtualDevices;
+    }
+
+}