tilesutilstrutsmodulesimpl.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/org/apache/struts/tiles/TilesUtilStrutsModulesImpl.java,v 1.1.1.1 2004/09/08 06:38:38 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:38 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Struts", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.struts.tiles;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.Globals;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.util.RequestUtils;

/**
 * Implementation of TilesUtil for Struts multi modules.
 * Methods in this implementation are aware of the Struts module context.
 * <br>
 * <ul>
 * <li>The method getFactory(...) returns the factory for the current Struts
 * module.</li>
 * <li>Methods doForward() and doInclude() use their counterparts in the
 * current RequestProcessor (todo).</li>
 * <li>The method createFactory(...) creates a factory for the current module and
 * stores it under the appropriate property name.</li>
 * </ul>
 */
public class TilesUtilStrutsModulesImpl extends TilesUtilStrutsImpl {

    /**
     * Do a forward using request dispatcher.
     *
     * This method is used by the Tiles package anytime a forward is required.
     * @param uri Uri or Definition name to forward.
     * @param request Current page request.
     * @param response Current page response.
     * @param servletContext Current servlet context.
     */
    public void doForward( String uri,
                           HttpServletRequest request, HttpServletResponse response, ServletContext servletContext)
        throws IOException, ServletException
    {
      // forward uri
    request.getRequestDispatcher(uri).forward(request, response);
    }

    /**
     * Do an include using request dispatcher.
     *
     * This method is used by the Tiles package anytime an include is required.
     * @param uri Uri or Definition name to forward.
     * @param request Current page request.
     * @param response Current page response.
     * @param servletContext Current servlet context.
     */
    public void doInclude(String uri,
                           HttpServletRequest request, HttpServletResponse response, ServletContext servletContext)
        throws IOException, ServletException
    {
      // include to uri
    request.getRequestDispatcher(uri).include(request, response);
    }

    /**
     * Get the definition factory from appropriate servlet context.
     * @param request Current request.
     * @param servletContext Current servlet context.
     * @return Definitions factory or null if not found.
     */
    public DefinitionsFactory getDefinitionsFactory( ServletRequest request, ServletContext servletContext)
    {
    return getDefinitionsFactory( servletContext, getModuleConfig((HttpServletRequest) request, servletContext));
    }

      /**
       * Get definition factory for the module attached to specified moduleConfig.
       * @param servletContext Current servlet context.
       * @param moduleConfig Module config of the module for which the factory is requested.
       * @return Definitions factory or null if not found.
       */
    public DefinitionsFactory getDefinitionsFactory(ServletContext servletContext, ModuleConfig moduleConfig)
    {
    //System.out.println("Get tiles factory for module '" + moduleConfig.getPrefix() + "'");
    return (DefinitionsFactory) servletContext.getAttribute( DEFINITIONS_FACTORY + moduleConfig.getPrefix());
    }

    /**
     * Create Definition factory from specified configuration object.
     * Create a ConfigurableDefinitionsFactory and initialize it with the configuration
     * object. This later can contains the factory classname to use.
     * Factory is made accessible from tags.
     * <p>
     * Fallback of several factory creation methods.
     *
     * @param servletContext Servlet Context passed to newly created factory.
     * @param factoryConfig Configuration object passed to factory.
     * @return newly created factory of type ConfigurableDefinitionsFactory.
     * @throws DefinitionsFactoryException If an error occur while initializing factory
     */
/*    public DefinitionsFactory createDefinitionsFactory( ServletContext servletContext, DefinitionsFactoryConfig factoryConfig)
        throws DefinitionsFactoryException
    {
      // Create configurable factory
    DefinitionsFactory factory = createDefinitionFactoryInstance(factoryConfig.getFactoryClassname());
    factory.init(factoryConfig, servletContext);
      // Make factory accessible from jsp tags (push it in appropriate context)
    makeDefinitionsFactoryAccessible(factory, servletContext);
    return factory;
    }
*/
    /**
     * Make definition factory accessible to tags.
     * Factory is stored in servlet context.
     * @param factory Factory to be made accessible.
     * @param servletContext Current servlet context.
     */
    protected void makeDefinitionsFactoryAccessible( DefinitionsFactory factory, ServletContext servletContext)
    {
    String prefix = factory.getConfig().getFactoryName();
    servletContext.setAttribute(DEFINITIONS_FACTORY + prefix, factory);
    }

    /**
     * Get Tiles RequestProcessor associated to the current module.
     * @param request Current request.
     * @param servletContext Current servlet context.
     * @return The {@link TilesRequestProcessor} for the current request.
     */
  protected TilesRequestProcessor getRequestProcessor( HttpServletRequest request, ServletContext servletContext)
  {
  ModuleConfig moduleConfig = getModuleConfig(request, servletContext);
  return (TilesRequestProcessor) servletContext.getAttribute( Globals.REQUEST_PROCESSOR_KEY + moduleConfig.getPrefix());
  }

    /**
     * Get the current ModuleConfig.
     * <br>
     * Lookup in the request and do selectModule if not found. The side effect
     * is, that the ModuleConfig object is set in the request if it was not present.
     * @param request Current request.
     * @param servletContext Current servlet context*.
     * @return The ModuleConfig for current request.
     */
  protected ModuleConfig getModuleConfig( HttpServletRequest request, ServletContext servletContext)
  {
  ModuleConfig moduleConfig = RequestUtils.getRequestModuleConfig(request);
  if (moduleConfig == null)
    { // not set, do it
      // ModuleConfig not found in current request. Select it.
    RequestUtils.selectModule(request, servletContext);
    moduleConfig = RequestUtils.getRequestModuleConfig(request);
    }

  return moduleConfig;
  }


}