/*************************GO-LICENSE-START*********************************
 * Copyright 2014 ThoughtWorks, Inc.
 *
 * 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.
 *************************GO-LICENSE-END***********************************/

package com.thoughtworks.go.server.web;

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

import static org.apache.commons.lang.StringUtils.isNotEmpty;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class FlashMessageInterceptor implements HandlerInterceptor {
    public FlashMessageInterceptor() {
    }

    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                             Object object) throws Exception {
        return true;
    }

    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                           Object object, ModelAndView modelAndView) throws Exception {
        if (modelAndView == null) { return; }
        
        if (isNotEmpty(httpServletRequest.getParameter("flash_message"))) {
            modelAndView.addObject("flash_message", httpServletRequest.getParameter("flash_message"));
        }
    }

    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                Object object, Exception exception) throws Exception {
    }

}