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Spring Framework example source code file (CommonsPathMapHandlerMapping.java)

This example Spring Framework source code file (CommonsPathMapHandlerMapping.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractpathmaphandlermapping, attributeindex, attributeindex, class, class, collection, collection, commonspathmaphandlermapping, exception, pathmap, pathmap, util

The Spring Framework CommonsPathMapHandlerMapping.java source code

/*
 * Copyright 2002-2008 the original author or authors.
 *
 * 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.springframework.web.servlet.handler.metadata;

import java.util.Collection;

import org.apache.commons.attributes.AttributeIndex;
import org.apache.commons.attributes.Attributes;

/**
 * Subclass of AbstractPathMapHandlerMapping that recognizes Commons Attributes
 * metadata attributes of type PathMap on application Controllers and automatically
 * wires them into the current servlet's WebApplicationContext.
 *
 * <p>
 * Controllers must have class attributes of the form:
 * <code>
 * &64;org.springframework.web.servlet.handler.commonsattributes.PathMap("/path.cgi")
 * </code>
 *
 * <p>The path must be mapped to the relevant Spring DispatcherServlet in /WEB-INF/web.xml.
 * It's possible to have multiple PathMap attributes on the one controller class.
 *
 * <p>To use this feature, you must compile application classes with Commons Attributes,
 * and run the Commons Attributes indexer tool on your application classes, which must
 * be in a Jar rather than in WEB-INF/classes.
 *
 * <p>Controllers instantiated by this class may have dependencies on middle tier
 * objects, expressed via JavaBean properties or constructor arguments. These will
 * be resolved automatically.
 *
 * <p>You will normally use this HandlerMapping with at most one DispatcherServlet in
 * your web application. Otherwise you'll end with one instance of the mapped controller
 * for each DispatcherServlet's context. You <i>might want this--for example, if
 * one's using a .pdf mapping and a PDF view, and another a JSP view, or if using
 * different middle tier objects, but should understand the implications. All
 * Controllers with attributes will be picked up by each DispatcherServlet's context.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @deprecated as of Spring 2.5, in favor of annotation-based request mapping.
 * To be removed in Spring 3.0.
 */
public class CommonsPathMapHandlerMapping extends AbstractPathMapHandlerMapping {
	
	/**
	 * Use Commons Attributes AttributeIndex to get a Collection of Class
	 * objects with the required PathMap attribute. Protected so that it can
	 * be overridden during testing.
	 */
	protected Class[] getClassesWithPathMapAttributes() throws Exception {
		AttributeIndex ai = new AttributeIndex(getClass().getClassLoader());
		Collection classes = ai.getClasses(PathMap.class);
		return (Class[]) classes.toArray(new Class[classes.size()]);
	}
	
	/**
	 * Use Commons Attributes to find PathMap attributes for the given class.
	 * We know there's at least one, as the getClassNamesWithPathMapAttributes
	 * method return this class name.
	 */
	protected PathMap[] getPathMapAttributes(Class handlerClass) {
		Collection atts = Attributes.getAttributes(handlerClass, PathMap.class);
		return (PathMap[]) atts.toArray(new PathMap[atts.size()]);
	}

}

Other Spring Framework examples (source code examples)

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