/*
* 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.config.annotation;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.handler.AbstractHandlerMapping;
import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;
/**
* Assists with the registration of simple automated controllers pre-configured
* with status code and/or a view.
*
* @author Rossen Stoyanchev
* @author Keith Donald
* @since 3.1
*/
public class ViewControllerRegistry {
private final List<ViewControllerRegistration> registrations = new ArrayList<ViewControllerRegistration>(4);
private final List<RedirectViewControllerRegistration> redirectRegistrations =
new ArrayList<RedirectViewControllerRegistration>(10);
private int order = 1;
/**
* Map a view controller to the given URL path (or pattern) in order to render
* a response with a pre-configured status code and view.
*/
public ViewControllerRegistration addViewController(String urlPath) {
ViewControllerRegistration registration = new ViewControllerRegistration(urlPath);
this.registrations.add(registration);
return registration;
}
/**
* Map a view controller to the given URL path (or pattern) in order to redirect
* to another URL. By default the redirect URL is expected to be relative to
* the current ServletContext, i.e. as relative to the web application root.
* @since 4.1
*/
public RedirectViewControllerRegistration addRedirectViewController(String urlPath, String redirectUrl) {
RedirectViewControllerRegistration registration = new RedirectViewControllerRegistration(urlPath, redirectUrl);
this.redirectRegistrations.add(registration);
return registration;
}
/**
* Map a simple controller to the given URL path (or pattern) in order to
* set the response status to the given code without rendering a body.
* @since 4.1
*/
public void addStatusController(String urlPath, HttpStatus statusCode) {
ViewControllerRegistration registration = new ViewControllerRegistration(urlPath);
registration.setStatusCode(statusCode);
registration.getViewController().setStatusOnly(true);
this.registrations.add(registration);
}
/**
* Specify the order to use for the {@code HandlerMapping} used to map view
* controllers relative to other handler mappings configured in Spring MVC.
* <p>By default this is set to 1, i.e. right after annotated controllers,
* which are ordered at 0.
*/
public void setOrder(int order) {
this.order = order;
}
/**
* Return the {@code HandlerMapping} that contains the registered view
* controller mappings, or {@code null} for no registrations.
*/
protected AbstractHandlerMapping getHandlerMapping() {
if (this.registrations.isEmpty() && this.redirectRegistrations.isEmpty()) {
return null;
}
Map<String, Object> urlMap = new LinkedHashMap<String, Object>();
for (ViewControllerRegistration registration : this.registrations) {
urlMap.put(registration.getUrlPath(), registration.getViewController());
}
for (RedirectViewControllerRegistration registration : this.redirectRegistrations) {
urlMap.put(registration.getUrlPath(), registration.getViewController());
}
SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
handlerMapping.setOrder(this.order);
handlerMapping.setUrlMap(urlMap);
return handlerMapping;
}
}