servletcontainerfinder.java

一个非常好的FRAMWRK!是一个外国组织做的!不!

/**
 * Copyright 2003-2005 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 com.jdon.container.finder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.ServletContext;

import com.jdon.container.ContainerWrapper;
import com.jdon.container.startup.ContainerSetupScript;
import com.jdon.container.builder.ContainerBuilder;
import com.jdon.util.Debug;

/**
 * the components finder that registed in container
 * same as JNDI Lookup.
 *
 * <p>@author <a href="mailto:[e-mail]">banq</a></p>
 */
public class ServletContainerFinder  {
  private final static String module = ServletContainerFinder.class.getName();
  
  private ContainerSetupScript ContainerSetupScript = new ContainerSetupScript();

  public ContainerWrapper findContainer(HttpServletRequest request) {
    ServletContext sc = request.getSession().getServletContext();    
    ContainerWrapper containerWrapper = findContainer(sc);
    
    return containerWrapper;
  }

  /**
   * lazy startup container
   * when first time the method is called, it will startup the
   * container
   * @param sc ServletContext
   * @return ContainerWrapper
   * @throws Exception
   */
  public ContainerWrapper findContainer(ServletContext sc) {
    ContainerBuilder cb = (ContainerBuilder) sc.getAttribute(ContainerBuilder.APPLICATION_CONTEXT_ATTRIBUTE_NAME);
    ContainerWrapper containerWrapper = null;
    try{
        if (!cb.isStartup())
            ContainerSetupScript.startup(sc);
        containerWrapper = cb.getContainerWrapper();       
    }catch(Exception ex){
        Debug.logError(" find the Container error: " + ex , module);     
    }
    return containerWrapper;
  }

}