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Spring Framework example source code file (MappingDispatchActionSupport.java)

This example Spring Framework source code file (MappingDispatchActionSupport.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

file, file, illegalstateexception, io, mappingdispatchaction, mappingdispatchactionsupport, messagesourceaccessor, messagesourceaccessor, servlet, servletcontext, servletcontext, webapplicationcontext, webapplicationcontext

The Spring Framework MappingDispatchActionSupport.java source code

/*
 * Copyright 2002-2005 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.struts;

import java.io.File;

import javax.servlet.ServletContext;

import org.apache.struts.action.ActionServlet;
import org.apache.struts.actions.MappingDispatchAction;

import org.springframework.context.support.MessageSourceAccessor;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.util.WebUtils;

/**
 * Convenience class for Spring-aware Struts 1.2 MappingDispatchActions.
 *
 * <p>Provides a reference to the current Spring application context, e.g.
 * for bean lookup or resource loading. Auto-detects a ContextLoaderPlugIn
 * context, falling back to the root WebApplicationContext. For typical
 * usage, i.e. accessing middle tier beans, use a root WebApplicationContext.
 *
 * <p>For classic Struts Actions, DispatchActions or LookupDispatchActions,
 * use the analogous {@link ActionSupport ActionSupport} or
 * {@link DispatchActionSupport DispatchActionSupport} /
 * {@link LookupDispatchActionSupport LookupDispatchActionSupport} class.
 *
 * <p>As an alternative approach, you can wire your Struts Actions themselves
 * as Spring beans, passing references to them via IoC rather than looking
 * up references in a programmatic fashion. Check out
 * {@link DelegatingActionProxy DelegatingActionProxy} and
 * {@link DelegatingRequestProcessor DelegatingRequestProcessor}.
 *
 * @author Juergen Hoeller
 * @since 1.1.3
 * @see ContextLoaderPlugIn#SERVLET_CONTEXT_PREFIX
 * @see WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE
 * @see org.springframework.web.context.ContextLoaderListener
 * @see org.springframework.web.context.ContextLoaderServlet
 * @see ActionSupport
 * @see DispatchActionSupport
 * @see LookupDispatchActionSupport
 * @see DelegatingActionProxy
 * @see DelegatingRequestProcessor
 */
public abstract class MappingDispatchActionSupport extends MappingDispatchAction {

	private WebApplicationContext webApplicationContext;

	private MessageSourceAccessor messageSourceAccessor;


	/**
	 * Initialize the WebApplicationContext for this Action.
	 * Invokes onInit after successful initialization of the context.
	 * @see #initWebApplicationContext
	 * @see #onInit
	 */
	public void setServlet(ActionServlet actionServlet) {
		super.setServlet(actionServlet);
		if (actionServlet != null) {
			this.webApplicationContext = initWebApplicationContext(actionServlet);
			this.messageSourceAccessor = new MessageSourceAccessor(this.webApplicationContext);
			onInit();
		}
		else {
			onDestroy();
		}
	}

	/**
	 * Fetch ContextLoaderPlugIn's WebApplicationContext from the ServletContext,
	 * falling back to the root WebApplicationContext (the usual case).
	 * @param actionServlet the associated ActionServlet
	 * @return the WebApplicationContext
	 * @throws IllegalStateException if no WebApplicationContext could be found
	 * @see DelegatingActionUtils#findRequiredWebApplicationContext
	 */
	protected WebApplicationContext initWebApplicationContext(ActionServlet actionServlet)
			throws IllegalStateException {

		return DelegatingActionUtils.findRequiredWebApplicationContext(actionServlet, null);
	}


	/**
	 * Return the current Spring WebApplicationContext.
	 */
	protected final WebApplicationContext getWebApplicationContext() {
		return this.webApplicationContext;
	}

	/**
	 * Return a MessageSourceAccessor for the application context
	 * used by this object, for easy message access.
	 */
	protected final MessageSourceAccessor getMessageSourceAccessor() {
		return this.messageSourceAccessor;
	}

	/**
	 * Return the current ServletContext.
	 */
	protected final ServletContext getServletContext() {
		return this.webApplicationContext.getServletContext();
	}

	/**
	 * Return the temporary directory for the current web application,
	 * as provided by the servlet container.
	 * @return the File representing the temporary directory
	 */
	protected final File getTempDir() {
		return WebUtils.getTempDir(getServletContext());
	}


	/**
	 * Callback for custom initialization after the context has been set up.
	 * @see #setServlet
	 */
	protected void onInit() {
	}

	/**
	 * Callback for custom destruction when the ActionServlet shuts down.
	 * @see #setServlet
	 */
	protected void onDestroy() {
	}

}

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