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.head.filter; 018 019import org.apache.wicket.markup.head.HeaderItem; 020import org.apache.wicket.markup.head.filter.FilteringHeaderResponse.IHeaderResponseFilter; 021 022/** 023 * A filter that takes another filter and always returns the opposite of another filter. This is 024 * useful where you have two filters (i.e. one for header and one for footer) and want to ensure 025 * that nothing ever has false returned for both cases. 026 * 027 * @author Jeremy Thomerson 028 */ 029public class OppositeHeaderResponseFilter implements IHeaderResponseFilter 030{ 031 032 private final String name; 033 private final IHeaderResponseFilter other; 034 035 /** 036 * Construct. 037 * 038 * @param name 039 * the name used by this filter for its bucket o' stuff 040 * @param other 041 * the other filter to return the opposite of 042 */ 043 public OppositeHeaderResponseFilter(String name, IHeaderResponseFilter other) 044 { 045 this.name = name; 046 this.other = other; 047 } 048 049 @Override 050 public String getName() 051 { 052 return name; 053 } 054 055 @Override 056 public boolean accepts(HeaderItem item) 057 { 058 return !other.accepts(item); 059 } 060}