[ONOS-5241] Add CLI to VPLS

Change-Id: I2d90a6370babea0538eb063b21ca29b49deb425f
diff --git a/apps/vpls/src/main/java/org/onosproject/vpls/cli/VplsShowCommand.java b/apps/vpls/src/main/java/org/onosproject/vpls/cli/VplsShowCommand.java
new file mode 100644
index 0000000..550d122
--- /dev/null
+++ b/apps/vpls/src/main/java/org/onosproject/vpls/cli/VplsShowCommand.java
@@ -0,0 +1,75 @@
+/*
+ * 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.vpls.cli;
+
+import com.google.common.collect.SetMultimap;
+import com.google.common.collect.Sets;
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.incubator.net.intf.Interface;
+import org.onosproject.vpls.config.VplsConfigurationService;
+
+import java.util.Set;
+
+import static com.google.common.base.Strings.isNullOrEmpty;
+
+/**
+ * CLI to show VPLS details.
+ */
+@Command(scope = "onos", name = "vpls-show",
+        description = "Shows the details of an existing VPLS")
+public class VplsShowCommand extends AbstractShellCommand {
+
+    private static final String NAME_FORMAT = "%10s: interface=%s";
+    private static final String NETWORK_NOT_FOUND =
+            "VPLS with name \'%s\' not found";
+    private VplsConfigurationService vplsConfigService =
+            get(VplsConfigurationService.class);
+
+    @Argument(index = 0, name = "NETWORK_NAME", description = "Name of the VPLS",
+            required = false, multiValued = false)
+    private String vplsName = null;
+
+    @Override
+    protected void execute() {
+        Set<String> vplsNames = vplsConfigService.getAllVpls();
+        SetMultimap<String, Interface> vplsNetowrks = vplsConfigService.getVplsNetworks();
+        Set<String> ifaceNames = Sets.newHashSet();
+
+
+        if (!isNullOrEmpty(vplsName)) {
+
+            if (vplsNames.contains(vplsName)) {
+                vplsNetowrks.get(vplsName).stream()
+                        .map(Interface::name)
+                        .forEach(ifaceNames::add);
+                print(NAME_FORMAT, vplsName, ifaceNames);
+            } else {
+                print(NETWORK_NOT_FOUND, vplsName);
+            }
+        } else {
+            vplsNames.forEach(vplsName -> {
+                ifaceNames.clear();
+                vplsNetowrks.get(vplsName).stream()
+                        .map(Interface::name)
+                        .forEach(ifaceNames::add);
+                print(NAME_FORMAT, vplsName, ifaceNames);
+            });
+        }
+    }
+}