/*
    * Copyright 2002-2014 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.mvc.method.annotation;
  
  import java.util.Map;
  
  import org.springframework.core.MethodParameter;
  import org.springframework.ui.Model;
  import org.springframework.ui.ModelMap;
  import org.springframework.validation.DataBinder;
  import org.springframework.web.bind.support.WebDataBinderFactory;
  import org.springframework.web.context.request.NativeWebRequest;
  import org.springframework.web.method.support.HandlerMethodArgumentResolver;
  import org.springframework.web.method.support.ModelAndViewContainer;
  import org.springframework.web.servlet.mvc.support.RedirectAttributes;
  import org.springframework.web.servlet.mvc.support.RedirectAttributesModelMap;
  
  /**
   * Resolves method arguments of type {@link RedirectAttributes}.
   *
   * <p>This resolver must be listed ahead of
   * {@link org.springframework.web.method.annotation.ModelMethodProcessor} and
   * {@link org.springframework.web.method.annotation.MapMethodProcessor},
   * which support {@link Map} and {@link Model} arguments both of which are
   * "super" types of {@code RedirectAttributes} and would also attempt to
   * resolve a {@code RedirectAttributes} argument.
   *
   * @author Rossen Stoyanchev
   * @since 3.1
   */
  public class RedirectAttributesMethodArgumentResolver implements HandlerMethodArgumentResolver {
  
  	@Override
  	public boolean supportsParameter(MethodParameter parameter) {
  		return RedirectAttributes.class.isAssignableFrom(parameter.getParameterType());
  	}
  
  	@Override
  	public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
  			NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
  
  		DataBinder dataBinder = binderFactory.createBinder(webRequest, null, null);
  		ModelMap redirectAttributes  = new RedirectAttributesModelMap(dataBinder);
  		mavContainer.setRedirectModel(redirectAttributes);
  		return redirectAttributes;
  	}
  
  }