servletcontainerfinder.java

Java/J2EE框架Jdon-Framework系统的Sample

/**
 * Copyright 2005 Jdon.com
 * 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.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.ServletContext;
import com.jdon.controller.container.ContainerBuilder;

/**
 * same as JNDI Lookup.
 *
 * <p>@author <a href="mailto:[e-mail]">banq</a></p>
 * <p>@version JdonFramework 2005 v1.0</p>
 */
public class ServletContainerFinder implements KeyConstants {
  private ContainerSetupScript ContainerSetupScript = new ContainerSetupScript();

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

  /**
   * 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) throws
      Exception {
    ContainerBuilder cb = (ContainerBuilder) sc.getAttribute(CONTAINER_FACTORY);
    if (!cb.isStartup()){
      ContainerSetupScript.startup(sc);
    }
    return cb.getContainerWrapper();
  }

}