createviewpageutil.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.util;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionMapping;

import com.jdon.controller.events.EventModel;
import com.jdon.controller.model.ModelIF;
import com.jdon.model.ModelForm;
import com.jdon.model.ModelHandler;
import com.jdon.model.ModelManager;
import com.jdon.strutsutil.FormBeanUtil;
import com.jdon.util.Debug;

/**
 * prepare for push a a create/insert view page, we need do some ready works.
 * 
 * 
 * @author banq
 */
public class CreateViewPageUtil {
    private final static String module = CreateViewPageUtil.class.getName();

    private ModelManager modelManager;


    public CreateViewPageUtil(ModelManager modelManager) {
        this.modelManager = modelManager;
    }

    /**
     * create a ModelForm object
     * 
     * two things: 1. create a ModelForm null instance 2. initial ModelForm
     * instance value, obtain a inital Model instance copy the Model instance to
     * the ModelForm instance
     * 
     * obtaining datas two ways: 1.call ModelHandler initForm method; 2.call
     * Modelhandler initModel method;
     * 
     */
    public void doCreate(ActionMapping actionMapping, ModelForm modelForm, HttpServletRequest request) throws Exception {
        Debug.logVerbose("[JdonFramework] enter doCreate... ", module);
        String formName = FormBeanUtil.getFormName(actionMapping);
        ModelHandler modelHandler = modelManager.borrowtHandlerObject(formName);
        try {

            ModelForm form = modelHandler.initForm(request);
            if (form != null) {
                form.setAction(ModelForm.CREATE_STR);
                FormBeanUtil.saveActionForm(form, actionMapping, request);
            } else {
                form = modelForm;
            }
            Debug.logVerbose("[JdonFramework] got a ModelForm ... " , module);

            ModelIF modelDTO = modelManager.getModelObject(formName);
            modelHandler.formCopyToModelIF(form, modelDTO);
            EventModel em = new EventModel();
            em.setActionName(form.getAction());
            em.setModelIF(modelDTO);

            modelDTO = initModel(em, request, modelHandler, form);
            //copy initial model to form , intial form;
            if (modelDTO != null) { // the model can be null
                Debug.logVerbose("[JdonFramework] got a Model From the 'initModel' method of the service", module);
                modelHandler.modelIFCopyToForm(modelDTO, form);
            }

        } catch (Exception ex) {
            Debug.logError("[JdonFramework]please check your service 、 model or form, error is: " + ex, module);
            throw new Exception("System error! please call system admin. " + ex);
        } finally {
            modelManager.returnHandlerObject(modelHandler); //返回modelhandler再用
        }
    }

    private ModelIF initModel(EventModel em, HttpServletRequest request, ModelHandler modelHandler, ModelForm form) throws Exception {
        ModelIF model = null;
        try {
            model = modelHandler.initModelIF(em, form, request);
        } catch (Exception ex) {
            Debug.logError("[JdonFramework] the method 'initForm' of your handler or 'initMethod' of your service happened error: " + ex, module);
            throw new Exception(ex);
        }
        return model;
    }

}