public String getFolder() {
        if (folder == null)
            folder = getFolder(name);

        return folder;
    }
@return The folder in which the asset is located in.
E.g. if the {@link #getName() name} is "Models/MyModel/MyModel.j3o"
then "Models/MyModel/" is returned.
jme3-core/src/main/java/com/jme3/asset/AssetKey.java