/*
    * Copyright 2002-2012 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.springframework.web.servlet.handler;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.springframework.util.Assert;
  import org.springframework.web.context.request.AsyncWebRequestInterceptor;
  import org.springframework.web.context.request.WebRequestInterceptor;
  import org.springframework.web.servlet.AsyncHandlerInterceptor;
  import org.springframework.web.servlet.ModelAndView;
  
  /**
   * Adapter that implements the Servlet HandlerInterceptor interface
   * and wraps an underlying WebRequestInterceptor.
   *
   * @author Juergen Hoeller
   * @since 2.0
   * @see org.springframework.web.context.request.WebRequestInterceptor
   * @see org.springframework.web.servlet.HandlerInterceptor
   */
  public class WebRequestHandlerInterceptorAdapter implements AsyncHandlerInterceptor {
  
  	private final WebRequestInterceptor requestInterceptor;
  
  
  	/**
  	 * Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor.
  	 * @param requestInterceptor the WebRequestInterceptor to wrap
  	 */
  	public WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor) {
  		Assert.notNull(requestInterceptor, "WebRequestInterceptor must not be null");
  		this.requestInterceptor = requestInterceptor;
  	}
  
  
  	@Override
  	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
  			throws Exception {
  
  		this.requestInterceptor.preHandle(new DispatcherServletWebRequest(request, response));
  		return true;
  	}
  
  	@Override
  	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
  			throws Exception {
  
  		this.requestInterceptor.postHandle(new DispatcherServletWebRequest(request, response),
  				(modelAndView != null && !modelAndView.wasCleared() ? modelAndView.getModelMap() : null));
  	}
  
  	@Override
  	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
  			throws Exception {
  
  		this.requestInterceptor.afterCompletion(new DispatcherServletWebRequest(request, response), ex);
  	}
  
  	@Override
  	public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) {
  		if (this.requestInterceptor instanceof AsyncWebRequestInterceptor) {
  			AsyncWebRequestInterceptor asyncInterceptor = (AsyncWebRequestInterceptor) this.requestInterceptor;
  			DispatcherServletWebRequest webRequest = new DispatcherServletWebRequest(request, response);
  			asyncInterceptor.afterConcurrentHandlingStarted(webRequest);
  		}
  	}
  
  }