Adding ability to select geo map from the GUI.

Change-Id: I956238500f868ef59bf947cb9f0aa7fc71d3fe84
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/MapSelectorMessageHandler.java b/web/gui/src/main/java/org/onosproject/ui/impl/MapSelectorMessageHandler.java
new file mode 100644
index 0000000..537b288
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/MapSelectorMessageHandler.java
@@ -0,0 +1,102 @@
+/*
+ * 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.ui.impl;
+
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import org.onosproject.ui.RequestHandler;
+import org.onosproject.ui.UiMessageHandler;
+
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Message handler for map selection functionality.
+ */
+class MapSelectorMessageHandler extends UiMessageHandler {
+
+    private static final String MAP_LIST_REQ = "mapSelectorRequest";
+    private static final String MAP_LIST_RESP = "mapSelectorResponse";
+
+    private static final String ORDER = "order";
+    private static final String MAPS = "maps";
+    private static final String MAP_ID = "id";
+    private static final String DESCRIPTION = "description";
+    private static final String SCALE = "scale";
+
+    private static final List<Map> SUPPORTED_MAPS =
+            ImmutableList.of(new Map("australia", "Australia", 1.0),
+                             new Map("ns_america", "North, Central and South America", 0.7),
+                             new Map("s_america", "South America", 0.9),
+                             new Map("usa", "United States", 1.0),
+                             new Map("bayarea", "Bay Area, California", 1.0),
+                             new Map("europe", "Europe", 2.5),
+                             new Map("italy", "Italy", 0.8),
+                             new Map("uk", "United Kingdom and Ireland", 0.6),
+                             new Map("japan", "Japan", 0.8),
+                             new Map("s_korea", "South Korea", 0.75),
+                             new Map("taiwan", "Taiwan", 0.7),
+                             new Map("world", "World", 1.0));
+
+    @Override
+    protected Collection<RequestHandler> createRequestHandlers() {
+        return ImmutableSet.of(
+                new MapListHandler()
+        );
+    }
+
+    private final class MapListHandler extends RequestHandler {
+        private MapListHandler() {
+            super(MAP_LIST_REQ);
+        }
+
+        @Override
+        public void process(long sid, ObjectNode payload) {
+            sendMessage(MAP_LIST_RESP, 0, mapsJson());
+        }
+    }
+
+    private ObjectNode mapsJson() {
+        ObjectNode payload = objectNode();
+        ArrayNode order = arrayNode();
+        ObjectNode maps = objectNode();
+        payload.set(ORDER, order);
+        payload.set(MAPS, maps);
+        SUPPORTED_MAPS.forEach(m -> {
+            maps.set(m.id, objectNode().put(MAP_ID, m.id)
+                    .put(DESCRIPTION, m.description)
+                    .put(SCALE, m.scale));
+            order.add(m.id);
+        });
+        return payload;
+    }
+
+    private static final class Map {
+        private final String id;
+        private final String description;
+        private final double scale;
+
+        private Map(String id, String description, double scale) {
+            this.id = id;
+            this.description = description;
+            this.scale = scale;
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
index f402298..5006e76 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
@@ -137,6 +137,7 @@
                 () -> ImmutableList.of(
                         new UserPreferencesMessageHandler(),
                         new TopologyViewMessageHandler(),
+                        new MapSelectorMessageHandler(),
                         new DeviceViewMessageHandler(),
                         new LinkViewMessageHandler(),
                         new HostViewMessageHandler(),