xmlmodelhandler.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.model.handler;

import com.jdon.model.*;
import javax.servlet.http.*;
import com.jdon.controller.events.*;
import com.jdon.controller.model.Model;
import com.jdon.controller.WebAppUtil;
import com.jdon.bussinessproxy.meta.MethodMetaArgs;

import com.jdon.util.Debug;
import com.jdon.controller.ContainerClient;

/**
 * auto gernerate the XmlModelHandler code from jdonframework.xml
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * @author banq
 * @version JdonFramework 2005 v1.0
 */
public class XmlModelHandler extends ModelHandler {
  private final static String module = XmlModelHandler.class.getName();
  private MethodMetaArgsFactory maFactory = new MethodMetaArgsFactory();
  private ContainerClient containerClient = new ContainerClient();

  public ModelForm initForm(HttpServletRequest request) throws java.lang.
      Exception {
    return null;
  }

  public Model findModelByKey(String keyValue, HttpServletRequest request) throws
      java.lang.Exception {
    Debug.logVerbose(" findModel By Key:" + keyValue, module);
    HandlerMetaDef hm = this.modelMapping.getHandlerMetaDef();
    String ejbName = hm.getServiceRef();
    MethodMetaArgs methodMetaArgs = maFactory.createfindMethod(hm, keyValue);
    Debug.logVerbose(" create MethodMetaArgs for ejbName:" + ejbName, module);
    Object result = containerClient.visitEJBService(ejbName,
                                               methodMetaArgs,
                                               request);
    Debug.logVerbose(" result type:" + result.getClass().getName(), module);
    return (Model) result;
  }

  public void serviceAction(EventModel em, HttpServletRequest request) throws
      java.lang.Exception {
    try {
      HandlerMetaDef hm = this.modelMapping.getHandlerMetaDef();
      String ejbName = hm.getServiceRef();
      MethodMetaArgs methodMetaArgs = null;
      switch (em.getActionType()) {
        case Event.CREATE:
          methodMetaArgs = maFactory.createCreateMethod(hm, em);
          break;
        case Event.EDIT:
          methodMetaArgs = maFactory.createUpdateMethod(hm, em);
          break;
        case Event.DELETE:
          methodMetaArgs = maFactory.createDeleteMethod(hm, em);
          break;
      }
      containerClient.visitEJBService(ejbName, methodMetaArgs, request);
    } catch (Exception ex) {
      Debug.logError(" serviceAction Error: " + ex, module);
      throw new Exception(" serviceAction Error:" + ex);
    }

  }

}