001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.resource.bundles;
018
019import org.apache.wicket.Application;
020import org.apache.wicket.ResourceBundles;
021import org.apache.wicket.markup.head.HeaderItem;
022import org.apache.wicket.request.resource.ResourceReference;
023
024/***
025 * Interface implemented by {@link ResourceReference}s that are bundles. A bundle is a resource that
026 * combines several resources in one item, for example, several javascript files combined into one.
027 * Bundles are rendered as a single {@link HeaderItem}, rather than several, and require only one
028 * HTTP request to download, which can greatly reduce the number HTTP requests needed to get all
029 * resources for a page. Resources need to be registered in {@link ResourceBundles} under
030 * {@link Application#getResourceBundles()}.
031 * 
032 * @author papegaaij
033 */
034public interface IResourceBundle
035{
036        /**
037         * @return the resources that are provided (part of) this resource.
038         */
039        Iterable<? extends HeaderItem> getProvidedResources();
040}