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; 018 019import java.util.Collections; 020import java.util.Objects; 021 022import org.apache.wicket.request.Response; 023import org.apache.wicket.util.lang.Args; 024 025/** 026 * Free form {@code HeaderItem}. No checks are performed on what is added to the header. 027 * 028 * @author papegaaij 029 */ 030public class StringHeaderItem extends HeaderItem 031{ 032 /** 033 * Creates a {@link StringHeaderItem} for the snippet. 034 * 035 * @param string 036 * string to be rendered to head 037 * 038 * @return A newly created {@link StringHeaderItem}. 039 */ 040 public static StringHeaderItem forString(CharSequence string) 041 { 042 return new StringHeaderItem(string); 043 } 044 045 private final CharSequence string; 046 047 /** 048 * Construct. 049 * 050 * @param string 051 */ 052 public StringHeaderItem(CharSequence string) 053 { 054 this.string = Args.notNull(string, "string"); 055 } 056 057 /** 058 * @return the string that gets added to the header. 059 */ 060 public CharSequence getString() 061 { 062 return string; 063 } 064 065 @Override 066 public void render(Response response) 067 { 068 response.write(getString()); 069 } 070 071 @Override 072 public Iterable<?> getRenderTokens() 073 { 074 return Collections.singletonList(getString()); 075 } 076 077 @Override 078 public String toString() 079 { 080 return "StringHeaderItem(" + getString() + ")"; 081 } 082 083 @Override 084 public boolean equals(Object o) 085 { 086 if (this == o) return true; 087 if (o == null || getClass() != o.getClass()) return false; 088 StringHeaderItem that = (StringHeaderItem) o; 089 return Objects.equals(string, that.string); 090 } 091 092 @Override 093 public int hashCode() 094 { 095 return Objects.hash(string); 096 } 097}