categorytreehandler.java

使用EJB实现的网上商城

package com.jdon.estore.web.catalog.tree;


import com.jdon.strutsutil.*;

import javax.servlet.http.HttpServletRequest;
import com.jdon.bussinessproxy.ServiceServerFactory;
import com.jdon.bussinessproxy.EJBDefinition;

import com.jdon.controller.model.Model;
import com.jdon.controller.events.*;

import com.jdon.estore.model.Category;
import com.jdon.estore.web.catalog.CategoryForm;
import com.jdon.estore.catalog.tree.CategoryTreeManagerLocal;
import com.jdon.estore.FrameworkServices;

/**
 * 管理树形结构，节点的增、删、改
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p>Company: 上海解道计算机技术有限公司</p>
 * @author not attributable
 * @version 1.0
 */
public class CategoryTreeHandler implements ModelHandler {

  private final static ServiceServerFactory sf = ServiceServerFactory.
      getInstance();


  public ModelForm initForm(HttpServletRequest request) throws Exception{
    return new CategoryForm();
  }

  public Model findModelByKey(String keyValue, HttpServletRequest request) throws Exception{

    CategoryTreeManagerLocal catalogManager = (CategoryTreeManagerLocal) sf.getService(
        FrameworkServices.CategoryTreeEJB, request);
    return catalogManager.getCategoryById(keyValue);
  }

  public void serviceAction(EventModel em, HttpServletRequest request) throws
      java.lang.
      Exception {
    CategoryTreeManagerLocal catalogManager = (CategoryTreeManagerLocal) sf.getService(
        FrameworkServices.CategoryTreeEJB, request);
    try {
      switch (em.getActionType()) {
        case Event.CREATE:
          catalogManager.addCategory(em);
          break;
        case Event.EDIT:
          catalogManager.updateCategory(em);
          break;
        case Event.DELETE:
          catalogManager.removeCategory(em);
          break;
      }
    } catch (Exception ex) {
      throw new Exception("System operation Error:" + ex);
    }
  }

}