001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.markup.html.image; 018 019import org.apache.wicket.model.IModel; 020import org.apache.wicket.request.mapper.parameter.PageParameters; 021import org.apache.wicket.request.resource.IResource; 022import org.apache.wicket.request.resource.ResourceReference; 023 024/** 025 * A subclass of {@link Image} that always adds random noise to the url every request to prevent the 026 * browser from caching the image. 027 * 028 * @see Image#shouldAddAntiCacheParameter() 029 * 030 * @author Igor Vaynberg (ivaynberg) 031 */ 032public class NonCachingImage extends Image 033{ 034 private static final long serialVersionUID = 1L; 035 036 /** 037 * Construct. 038 * 039 * @see Image#Image(String, IModel) 040 * 041 * @param id 042 * @param model 043 */ 044 public NonCachingImage(String id, IModel<?> model) 045 { 046 super(id, model); 047 } 048 049 /** 050 * Construct. 051 * 052 * @see Image#Image(String, IResource, IResource...) 053 * 054 * @param id 055 * @param imageResource 056 */ 057 public NonCachingImage(String id, IResource imageResource) 058 { 059 super(id, imageResource); 060 } 061 062 /** 063 * Construct. 064 * 065 * @see Image#Image(String, ResourceReference, PageParameters, ResourceReference...) 066 * 067 * @param id 068 * @param resourceReference 069 * @param resourceParameters 070 */ 071 public NonCachingImage(String id, ResourceReference resourceReference, 072 PageParameters resourceParameters) 073 { 074 super(id, resourceReference, resourceParameters); 075 } 076 077 /** 078 * Construct. 079 * 080 * @see Image#Image(String, ResourceReference, ResourceReference...) 081 * 082 * @param id 083 * @param resourceReference 084 */ 085 public NonCachingImage(String id, ResourceReference resourceReference) 086 { 087 super(id, resourceReference); 088 } 089 090 /** 091 * Construct. 092 * 093 * @see Image#Image(String, String) 094 * 095 * 096 * @param id 097 * @param string 098 */ 099 public NonCachingImage(String id, String string) 100 { 101 super(id, string); 102 } 103 104 /** 105 * Construct. 106 * 107 * @see Image#Image(String) 108 * 109 * @param id 110 */ 111 public NonCachingImage(String id) 112 { 113 super(id); 114 } 115 116 /** 117 * Overridden to prevent caching. 118 * 119 * @return always {@code true} 120 */ 121 @Override 122 protected boolean shouldAddAntiCacheParameter() 123 { 124 return true; 125 } 126}