modelviewaction.java

来自「一个非常好的FRAMWRK!是一个外国组织做的!不!」· Java 代码 · 共 118 行

/**
 * 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.strutsutil;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMessage;
import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.jdon.util.Debug;

import com.jdon.container.finder.ComponentKeys;
import com.jdon.controller.WebAppUtil;
import com.jdon.controller.model.Model;
import com.jdon.model.ModelForm;
import com.jdon.model.ModelManager;
import com.jdon.strutsutil.util.CreateViewPageUtil;
import com.jdon.strutsutil.util.EditeViewPageUtil;

import javax.servlet.ServletContext;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.util.ModuleUtils;


/**
 * this class can be invoked in browser's url
 * this class will push create/insert view page
 * or editable view page.
 * 
 * the push result is according action's value:
 * 1. null or create ; will push a view page that user can create;
 * 2. edit; will push a editbale view page that has existed data;
 *
 *how to use this class?
 * 1. this class can be configured in struts-config.xml
 *
 * <action name="productForm" type="com.jdon.strutsutil.ModelViewAction" validate="false" scope="request" path="/admin/productAction">
 *      <forward name="create" path="/customer.jsp" />
 *      <forward name="edit|add|remove" path="/customer.jsp" />
 * </action>
 * forward's value is same as action's value
 *
 * 2. setup in ApplicationResources.propeties
 * id.notfound =not found the record (in your language)
 *
 * @author banq
 */
public class ModelViewAction extends Action {

  private final static String module = ModelViewAction.class.getName();
  private ModuleUtils moduleUtils = ModuleUtils.getInstance();
  protected ModelManager modelManager;
  protected CreateViewPageUtil createViewPage;
  protected EditeViewPageUtil editeViewPage;


  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm,
                               HttpServletRequest request,
                               HttpServletResponse response) throws
      Exception {

    if (modelManager == null){
      ServletContext sc = this.getServlet().getServletContext();
      modelManager = (ModelManager)WebAppUtil.getComponentInstance(ComponentKeys.MODEL_MANAGER, sc);
      createViewPage = new CreateViewPageUtil(modelManager);
      editeViewPage = new EditeViewPageUtil(modelManager);
    }

    ModuleConfig moduleConfig =   moduleUtils.getModuleConfig(request, getServlet().getServletContext());

    String action = request.getParameter("action");
    if ( (action == null) || action.equalsIgnoreCase(ModelForm.CREATE_STR)) {
      Debug.logVerbose("--> enter create process ", module);
      createViewPage.doCreate(actionMapping, actionForm, request, moduleConfig);
      return actionMapping.findForward(ModelForm.CREATE_STR);
    } else if (!FormBeanUtil.validateAction(action, actionMapping))
      throw new Exception("this action:" + action + " is invalid!");
    else {
      Debug.logVerbose("--> enter " + action + " process ", module);
      Model model = editeViewPage.getModelForEdit(actionMapping, actionForm,
                                                request, moduleConfig);
      if (model == null) { //查询失败
        if (actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME) != null)
          return actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME);
        else {
          ActionMessages errors = new ActionMessages();
          ActionMessage error = new ActionMessage("id.notfound");
          errors.add(ActionErrors.GLOBAL_MESSAGE, error);
          saveErrors(request, errors);
          return actionMapping.findForward(action);
        }
      } else
        return actionMapping.findForward(action);
    }
  }

}