Command to list optical connectivities

Change-Id: Ic1b69c04cbc51fd384711de73abe91f1b0d11abb
diff --git a/apps/newoptical/src/main/java/org/onosproject/newoptical/cli/OpticalConnectivityIdCompleter.java b/apps/newoptical/src/main/java/org/onosproject/newoptical/cli/OpticalConnectivityIdCompleter.java
new file mode 100644
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+++ b/apps/newoptical/src/main/java/org/onosproject/newoptical/cli/OpticalConnectivityIdCompleter.java
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+/*
+ * Copyright 2017-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.newoptical.cli;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.onlab.util.Identifier;
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.newoptical.OpticalConnectivity;
+import org.onosproject.newoptical.api.OpticalPathService;
+
+import static org.onosproject.cli.AbstractShellCommand.get;
+
+/**
+ * Completer for OpticalConnectivityId.
+ */
+public class OpticalConnectivityIdCompleter extends AbstractChoicesCompleter {
+
+    @Override
+    protected List<String> choices() {
+        OpticalPathService opticalPathService = get(OpticalPathService.class);
+
+        return opticalPathService.listConnectivity().stream()
+                .map(OpticalConnectivity::id)
+                .map(Identifier::id)
+                .map(String::valueOf)
+                .collect(Collectors.toList());
+    }
+
+}