GUI -- Added facility to upload and track various sprite JSON definitions. WIP

Change-Id: I5629e07d84b91d2d885737a9011acc4e13538cf2
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/SpriteService.java b/web/gui/src/main/java/org/onosproject/ui/impl/SpriteService.java
new file mode 100644
index 0000000..7312329
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/SpriteService.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2015 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.JsonNode;
+
+import java.util.Set;
+
+/**
+ * Provisional service to keep track of the topology view sprite definitions.
+ */
+public interface SpriteService {
+
+    /**
+     * Returns set of registered sprite definition names.
+     *
+     * @return set of sprite definition names
+     */
+    Set<String> getNames();
+
+    /**
+     * Registers sprite data under the specified name.
+     *
+     * @param name       sprite definition name
+     * @param spriteData sprite data
+     */
+    void put(String name, JsonNode spriteData);
+
+    /**
+     * Returns the sprite definition registered under the given name.
+     *
+     * @param name sprite definition name
+     * @return sprite data
+     */
+    JsonNode get(String name);
+
+}