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/*
* Copyright 2002-2016 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 org.springframework.core.MethodParameter;
import org.springframework.util.PatternMatchUtils;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.SmartView;
import org.springframework.web.servlet.View;
/**
* Handles return values of type {@link ModelAndView} copying view and model
* information to the {@link ModelAndViewContainer}.
*
* <p>If the return value is {@code null}, the
* {@link ModelAndViewContainer#setRequestHandled(boolean)} flag is set to
* {@code true} to indicate the request was handled directly.
*
* <p>A {@link ModelAndView} return type has a set purpose. Therefore this
* handler should be configured ahead of handlers that support any return
* value type annotated with {@code @ModelAttribute} or {@code @ResponseBody}
* to ensure they don't take over.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class ModelAndViewMethodReturnValueHandler implements HandlerMethodReturnValueHandler {
private String[] redirectPatterns;
/**
* Configure one more simple patterns (as described in
* {@link org.springframework.util.PatternMatchUtils#simpleMatch}) to use in order to recognize
* custom redirect prefixes in addition to "redirect:".
* <p>Note that simply configuring this property will not make a custom
* redirect prefix work. There must be a custom View that recognizes the
* prefix as well.
* @since 4.1
*/
public void setRedirectPatterns(String... redirectPatterns) {
this.redirectPatterns = redirectPatterns;
}
/**
* The configured redirect patterns, if any.
*/
public String[] getRedirectPatterns() {
return this.redirectPatterns;
}
@Override
public boolean supportsReturnType(MethodParameter returnType) {
return ModelAndView.class.isAssignableFrom(returnType.getParameterType());
}
@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {
if (returnValue == null) {
mavContainer.setRequestHandled(true);
return;
}
ModelAndView mav = (ModelAndView) returnValue;
if (mav.isReference()) {
String viewName = mav.getViewName();
mavContainer.setViewName(viewName);
if (viewName != null && isRedirectViewName(viewName)) {
mavContainer.setRedirectModelScenario(true);
}
}
else {
View view = mav.getView();
mavContainer.setView(view);
if (view instanceof SmartView) {
if (((SmartView) view).isRedirectView()) {
mavContainer.setRedirectModelScenario(true);
}
}
}
mavContainer.setStatus(mav.getStatus());
mavContainer.addAllAttributes(mav.getModel());
}
/**
* Whether the given view name is a redirect view reference.
* The default implementation checks the configured redirect patterns and
* also if the view name starts with the "redirect:" prefix.
* @param viewName the view name to check, never {@code null}
* @return "true" if the given view name is recognized as a redirect view
* reference; "false" otherwise.
*/
protected boolean isRedirectViewName(String viewName) {
if (PatternMatchUtils.simpleMatch(this.redirectPatterns, viewName)) {
return true;
}
return viewName.startsWith("redirect:");
}
}
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