001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: StringValueHandler.java 468652 2006-10-28 07:05:17Z minchau $
020 */
021
022 package org.apache.xalan.xsltc.runtime;
023
024 import org.xml.sax.SAXException;
025
026 import org.apache.xml.serializer.EmptySerializer;
027
028 /**
029 * @author Jacek Ambroziak
030 * @author Santiago Pericas-Geertsen
031 * @author Morten Jorgensen
032 */
033 public final class StringValueHandler extends EmptySerializer {
034
035 private StringBuffer _buffer = new StringBuffer();
036 private String _str = null;
037 private static final String EMPTY_STR = "";
038 private boolean m_escaping = false;
039 private int _nestedLevel = 0;
040
041 public void characters(char[] ch, int off, int len)
042 throws SAXException
043 {
044 if (_nestedLevel > 0)
045 return;
046
047 if (_str != null) {
048 _buffer.append(_str);
049 _str = null;
050 }
051 _buffer.append(ch, off, len);
052 }
053
054 public String getValue() {
055 if (_buffer.length() != 0) {
056 String result = _buffer.toString();
057 _buffer.setLength(0);
058 return result;
059 }
060 else {
061 String result = _str;
062 _str = null;
063 return (result != null) ? result : EMPTY_STR;
064 }
065 }
066
067 public void characters(String characters) throws SAXException {
068 if (_nestedLevel > 0)
069 return;
070
071 if (_str == null && _buffer.length() == 0) {
072 _str = characters;
073 }
074 else {
075 if (_str != null) {
076 _buffer.append(_str);
077 _str = null;
078 }
079
080 _buffer.append(characters);
081 }
082 }
083
084 public void startElement(String qname) throws SAXException {
085 _nestedLevel++;
086 }
087
088 public void endElement(String qname) throws SAXException {
089 _nestedLevel--;
090 }
091
092 // Override the setEscaping method just to indicate that this class is
093 // aware that that method might be called.
094 public boolean setEscaping(boolean bool) {
095 boolean oldEscaping = m_escaping;
096 m_escaping = bool;
097
098 return bool;
099 }
100
101 /**
102 * The value of a PI must not contain the substring "?>". Should
103 * that substring be present, replace it by "? >".
104 */
105 public String getValueOfPI() {
106 final String value = getValue();
107
108 if (value.indexOf("?>") > 0) {
109 final int n = value.length();
110 final StringBuffer valueOfPI = new StringBuffer();
111
112 for (int i = 0; i < n;) {
113 final char ch = value.charAt(i++);
114 if (ch == '?' && value.charAt(i) == '>') {
115 valueOfPI.append("? >"); i++;
116 }
117 else {
118 valueOfPI.append(ch);
119 }
120 }
121 return valueOfPI.toString();
122 }
123 return value;
124 }
125 }