001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.servlet.mvc;
018
019import javax.servlet.http.HttpServletRequest;
020import javax.servlet.http.HttpServletResponse;
021
022import org.springframework.lang.Nullable;
023import org.springframework.web.HttpRequestHandler;
024import org.springframework.web.servlet.HandlerAdapter;
025import org.springframework.web.servlet.ModelAndView;
026
027/**
028 * Adapter to use the plain {@link org.springframework.web.HttpRequestHandler}
029 * interface with the generic {@link org.springframework.web.servlet.DispatcherServlet}.
030 * Supports handlers that implement the {@link LastModified} interface.
031 *
032 * <p>This is an SPI class, not used directly by application code.
033 *
034 * @author Juergen Hoeller
035 * @since 2.0
036 * @see org.springframework.web.servlet.DispatcherServlet
037 * @see org.springframework.web.HttpRequestHandler
038 * @see LastModified
039 * @see SimpleControllerHandlerAdapter
040 */
041public class HttpRequestHandlerAdapter implements HandlerAdapter {
042
043        @Override
044        public boolean supports(Object handler) {
045                return (handler instanceof HttpRequestHandler);
046        }
047
048        @Override
049        @Nullable
050        public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
051                        throws Exception {
052
053                ((HttpRequestHandler) handler).handleRequest(request, response);
054                return null;
055        }
056
057        @Override
058        public long getLastModified(HttpServletRequest request, Object handler) {
059                if (handler instanceof LastModified) {
060                        return ((LastModified) handler).getLastModified(request);
061                }
062                return -1L;
063        }
064
065}