001/* 002 * Copyright 2002-2017 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.handler; 018 019import javax.servlet.http.HttpServletRequest; 020import javax.servlet.http.HttpServletResponse; 021 022import org.springframework.lang.Nullable; 023import org.springframework.web.servlet.AsyncHandlerInterceptor; 024import org.springframework.web.servlet.ModelAndView; 025 026/** 027 * Abstract adapter class for the {@link AsyncHandlerInterceptor} interface, 028 * for simplified implementation of pre-only/post-only interceptors. 029 * 030 * @author Juergen Hoeller 031 * @since 05.12.2003 032 */ 033public abstract class HandlerInterceptorAdapter implements AsyncHandlerInterceptor { 034 035 /** 036 * This implementation always returns {@code true}. 037 */ 038 @Override 039 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) 040 throws Exception { 041 042 return true; 043 } 044 045 /** 046 * This implementation is empty. 047 */ 048 @Override 049 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, 050 @Nullable ModelAndView modelAndView) throws Exception { 051 } 052 053 /** 054 * This implementation is empty. 055 */ 056 @Override 057 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, 058 @Nullable Exception ex) throws Exception { 059 } 060 061 /** 062 * This implementation is empty. 063 */ 064 @Override 065 public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, 066 Object handler) throws Exception { 067 } 068 069}