* @param manifestFileHandle
* The manifest file handle.
*/
public void loadManifest(FileHandle manifestFileHandle) {
Json json = new Json();
ObjectMap<String, JsonValue> assetGroups = json.fromJson(ObjectMap.class, manifestFileHandle);
for(ObjectMap.Entry<String, JsonValue> entry : assetGroups.entries()) {
AssetGroup assetGroup = new AssetGroup();
assetGroup.read(json, entry.value);
assetGroupMap.put(entry.key, assetGroup);
}