[ONOS-6349] Add CLI for querying mappings from MappingService

Change-Id: I982ed17fc599314b709c0c46fca9e2a00b80da08
diff --git a/apps/mappingmanagement/cli/src/main/java/org/onosproject/mapping/cli/MappingStoreTypeCompleter.java b/apps/mappingmanagement/cli/src/main/java/org/onosproject/mapping/cli/MappingStoreTypeCompleter.java
new file mode 100755
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+++ b/apps/mappingmanagement/cli/src/main/java/org/onosproject/mapping/cli/MappingStoreTypeCompleter.java
@@ -0,0 +1,38 @@
+/*
+ * 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.mapping.cli;
+
+import com.google.common.collect.ImmutableList;
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.mapping.MappingStore.Type;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Mapping store type completer.
+ */
+public class MappingStoreTypeCompleter extends AbstractChoicesCompleter {
+
+    private static final List<Type> STORE_TYPES =
+            ImmutableList.of(Type.MAP_CACHE, Type.MAP_DATABASE);
+
+    @Override
+    protected List<String> choices() {
+        return STORE_TYPES.stream().map(type ->
+                type.toString().toLowerCase()).collect(Collectors.toList());
+    }
+}
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