org.sarons.spring4me.web.servlet.DispatcherServlet.java Source code

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Here is the source code for org.sarons.spring4me.web.servlet.DispatcherServlet.java

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/*
 * Copyright 2011-2012 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 org.sarons.spring4me.web.servlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.sarons.spring4me.web.Keys;
import org.sarons.spring4me.web.steroetype.Widget;
import org.sarons.spring4me.web.widget.config.WidgetConfig;
import org.sarons.spring4me.web.widget.http.HttpWidgetRequest;
import org.sarons.spring4me.web.widget.utils.WidgetConfigUtils;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.ui.ModelMap;
import org.springframework.util.StringUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.FlashMap;
import org.springframework.web.servlet.FlashMapManager;
import org.springframework.web.servlet.HandlerExecutionChain;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.support.RequestContextUtils;

/**
 * 
 * @author Gavin
 * @since 0.4.0
 * @create 2012-5-23 - ?10:07:39
 */
@SuppressWarnings("serial")
public class DispatcherServlet extends org.springframework.web.servlet.DispatcherServlet {

    private static final String CONTEXT_CONFIG_LOCATION = "/WEB-INF/spring4me/dispatcherContext.xml";

    private String contextConfigLocation = CONTEXT_CONFIG_LOCATION;

    public void setContextConfigLocation(String contextConfigLocation) {
        this.contextConfigLocation = contextConfigLocation;
    }

    @Override
    public String getContextConfigLocation() {
        return this.contextConfigLocation;
    }

    @Override
    protected String getDefaultViewName(HttpServletRequest request) throws Exception {
        return null;
    }

    @Override
    protected HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
        HandlerExecutionChain mappedHandler = super.getHandler(request);
        //
        if (mappedHandler != null && mappedHandler.getHandler() != null) {
            prepareFlashMapForWidget(request, mappedHandler.getHandler());
        }
        //
        return mappedHandler;
    }

    @Override
    protected void render(ModelAndView mv, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        //
        exportContextPath(request, mv);
        //
        exportWidgetConfig(request, mv);
        //
        exportWidgetModel(request, mv);
        //
        if (mv != null && mv.hasView()) {
            //
            super.render(mv, request, response);
        }
    }

    private void exportContextPath(HttpServletRequest request, ModelAndView mv) {
        mv.addObject(Keys.REQUEST_KEY_BASE, request.getContextPath());
        request.setAttribute(Keys.REQUEST_KEY_BASE, request.getContextPath());
    }

    private void exportWidgetConfig(HttpServletRequest request, ModelAndView mv) {
        if (request instanceof HttpWidgetRequest) {
            WidgetConfig widgetConfig = WidgetConfigUtils.getWidgetConfig(request);
            mv.addObject(Keys.REQUEST_KEY_WIDGET_CONFIG, widgetConfig);
        }
    }

    private void exportWidgetModel(HttpServletRequest request, ModelAndView mv) {
        if (request instanceof HttpWidgetRequest) {
            ModelMap widgetModel = (ModelMap) mv.getModelMap();
            ((HttpWidgetRequest) request).bindWidgetModel(widgetModel);
        }
    }

    private void prepareFlashMapForWidget(HttpServletRequest request, Object handler) {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            //
            Widget widget = AnnotationUtils.getAnnotation(handlerMethod.getBeanType(), Widget.class);
            if (widget != null) {
                //
                String widgetName = widget.value();
                if (!StringUtils.hasText(widgetName)) {
                    String targetWidget = handlerMethod.getBeanType().getSimpleName();
                    widgetName = StringUtils.uncapitalize(targetWidget);
                }
                //
                FlashMap flashMap = RequestContextUtils.getOutputFlashMap(request);
                flashMap.setTargetRequestPath(widgetName);
                FlashMapManager flashMapManager = RequestContextUtils.getFlashMapManager(request);
                flashMapManager.saveOutputFlashMap(flashMap, request, null);
            }
        }
    }

}