iresourcelistener.java

来自「Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容」· Java 代码 · 共 54 行

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.wicket;

import org.apache.wicket.request.RequestParameters;
import org.apache.wicket.request.target.resource.ComponentResourceRequestTarget;

/**
 * Listens for requests regarding resources. Such resources are typically non-static in nature and
 * may even be created on the fly.
 * <p>
 * One use for resource listeners is that they may be used to create components such as Image which
 * respond to requests with a localized resource loaded from the classpath. The Image class allows
 * reusable components to transparently bundle localized image resources. Components that use Image
 * resources (instead of referencing static images in their markup) can be distributed as a
 * self-contained JAR file.
 * 
 * @see org.apache.wicket.markup.html.image.Image
 * @see org.apache.wicket.markup.html.image.resource.RenderedDynamicImageResource
 * @author Jonathan Locke
 */
public interface IResourceListener extends IRequestListener
{
	/** Resource listener interface object */
	public static final RequestListenerInterface INTERFACE = new RequestListenerInterface(
			IResourceListener.class)
	{
		public IRequestTarget newRequestTarget(Page page, Component component,
				RequestListenerInterface listener, RequestParameters requestParameters)
		{
			return new ComponentResourceRequestTarget(page, component, listener);
		}
	};

	/**
	 * Called when a resource is requested.
	 */
	void onResourceRequested();
}