001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.util.text; 016 017 import java.util.HashMap; 018 import java.util.Map; 019 020 /** 021 * The default implementation of a character translator source. 022 * Returns a standard HTML translator that encodes everything that is non-safe 023 * or an HTML translator that encodes only non-safe ASCII symbols 024 * if the encoding is a unicode one. 025 * 026 * @author mb 027 * @since 4.0 028 */ 029 public class DefaultCharacterTranslatorSource implements ICharacterTranslatorSource 030 { 031 private static final ICharacterTranslator DEFAULT_TRANSLATOR = new MarkupCharacterTranslator(); 032 private static final ICharacterTranslator UNICODE_TRANSLATOR = new MarkupCharacterTranslator(false); 033 034 private final static Map _translators; 035 036 static { 037 _translators = new HashMap(); 038 _translators.put("UTF-8", UNICODE_TRANSLATOR); 039 _translators.put("UTF-7", UNICODE_TRANSLATOR); 040 _translators.put("UTF-16", UNICODE_TRANSLATOR); 041 _translators.put("UTF-16BE", UNICODE_TRANSLATOR); 042 _translators.put("UTF-16LE", UNICODE_TRANSLATOR); 043 } 044 045 /** 046 * Returns a translator that encodes all non-safe characters into their HTML equivalents. 047 * 048 * @see org.apache.tapestry.util.text.ICharacterTranslatorSource#getDefaultTranslator() 049 */ 050 public ICharacterTranslator getDefaultTranslator() { 051 return DEFAULT_TRANSLATOR; 052 } 053 054 /** 055 * If the encoding is a Unicode one, returns a translator that encodes only the 056 * non-safe ASCII characters and leaves the others untouched. 057 * Otherwise, returns the default translator. 058 * 059 * @see org.apache.tapestry.util.text.ICharacterTranslatorSource#getTranslator(java.lang.String) 060 */ 061 public ICharacterTranslator getTranslator(String encoding) { 062 ICharacterTranslator translator = (ICharacterTranslator) _translators.get(encoding.toUpperCase()); 063 if (translator != null) 064 return translator; 065 return getDefaultTranslator(); 066 } 067 068 }