modelviewaction.java

用jbuilder写的源程序

/**
 * Copyright 2003-2006 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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import com.jdon.controller.model.ModelIF;
import com.jdon.model.ModelForm;
import com.jdon.util.Debug;
import com.jdon.util.UtilValidate;

/**
 * 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" path="/customer.jsp" />
 * </action>
 * forward's value is same as action's value
 * if the action value is not create or edit, the action will directly forward
 * the action forward page, example: the action vaule is XXXX:
 * <forward name="XXXX" path="/xxxx.jsp" />
 *
 * 2. setup in ApplicationResources.propeties
 * id.notfound =not found the record (in your language)
 *
 * @author banq
 */
public class ModelViewAction extends ModelBaseAction {

    private final static String module = ModelViewAction.class.getName();


    /**
     * accept the form submit, action parameter must be : create or edit;
     * if not, will directly forward the jsp page mapping for the action value;
     * 
     * 
     */
    public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        Debug.logVerbose("[JdonFramework]--> enter ModelViewAction process ", module);
        intContext(this.getServlet().getServletContext());

        ModelForm modelForm = FormBeanUtil.getModelForm(actionMapping, actionForm, request);

        if ((UtilValidate.isEmpty(modelForm.getAction()) ) || modelForm.getAction().equalsIgnoreCase(ModelForm.CREATE_STR)) {
            Debug.logVerbose("[JdonFramework]--> enter create process ", module);
            modelForm.setAction(ModelForm.CREATE_STR);
            createViewPage.doCreate(actionMapping, modelForm, request);

        } else if (modelForm.getAction().equalsIgnoreCase(ModelForm.EDIT_STR)) {

            Debug.logVerbose("[JdonFramework]--> enter " + ModelForm.EDIT_STR + " process ", module);
            ModelIF model = editeViewPage.getModelForEdit(actionMapping, modelForm, request);
            if (model == null) //not found the model
                return errorsForward(modelForm.getAction(), actionMapping, request);

        }else{//other regard as create
            Debug.logVerbose("[JdonFramework]-->action value not supported, enter create process2 ", module);
            modelForm.setAction(ModelForm.CREATE_STR);
            createViewPage.doCreate(actionMapping, modelForm, request);
        }
        Debug.logVerbose("[JdonFramework]--> push the jsp that forward name is '" + modelForm.getAction() + "'", module);
        return actionMapping.findForward(modelForm.getAction());
    }
    

    private ActionForward errorsForward(String action, ActionMapping actionMapping, HttpServletRequest request) {
        ActionMessages errors = new ActionMessages();
        ActionMessage error = new ActionMessage("id.notfound");
        errors.add(ActionErrors.GLOBAL_MESSAGE, error);
        saveErrors(request, errors);
        if (actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME) != null)
            return actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME);
        else
            return actionMapping.findForward(action);
    }

}