001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.xml.readers;
030:
031: import com.caucho.util.CharBuffer;
032: import com.caucho.vfs.ReadStream;
033: import com.caucho.xml.XmlParser;
034:
035: import java.io.IOException;
036:
037: /**
038: * A fast reader to convert bytes to characters for parsing XML.
039: */
040: public class MacroReader extends XmlReader {
041: char[] _buffer = new char[256];
042: int _offset;
043: int _length;
044:
045: /**
046: * Create a new reader.
047: */
048: public MacroReader() {
049: }
050:
051: public void init(XmlParser parser, XmlReader next) {
052: _parser = parser;
053: _next = next;
054: _offset = 0;
055: _length = 0;
056: }
057:
058: public ReadStream getReadStream() {
059: return _next.getReadStream();
060: }
061:
062: public String getSystemId() {
063: if (_next != null)
064: return _next.getSystemId();
065: else
066: return super .getSystemId();
067: }
068:
069: public String getPublicId() {
070: if (_next != null)
071: return _next.getPublicId();
072: else
073: return super .getPublicId();
074: }
075:
076: public String getFilename() {
077: if (_next != null)
078: return _next.getFilename();
079: else
080: return super .getFilename();
081: }
082:
083: public int getLine() {
084: if (_next != null)
085: return _next.getLine();
086: else
087: return super .getLine();
088: }
089:
090: /**
091: * Adds a string to the macro.
092: */
093: public void add(String s) {
094: int len = s.length();
095:
096: for (int i = 0; i < len; i++)
097: add(s.charAt(i));
098: }
099:
100: /**
101: * Adds a char buffer to the macro.
102: */
103: public void add(CharBuffer cb) {
104: int len = cb.length();
105:
106: for (int i = 0; i < len; i++)
107: add(cb.charAt(i));
108: }
109:
110: /**
111: * Adds a new character to the buffer.
112: */
113: public void add(char ch) {
114: if (_offset == _length) {
115: _offset = 0;
116: _length = 0;
117: }
118:
119: if (_buffer.length == _length) {
120: char[] newBuffer = new char[2 * _buffer.length];
121: System.arraycopy(_buffer, 0, newBuffer, 0, _length);
122: _buffer = newBuffer;
123: }
124:
125: _buffer[_length++] = ch;
126: }
127:
128: public void prepend(char ch) {
129: if (_offset == _length) {
130: _offset = 0;
131: _length = 0;
132: }
133:
134: if (_buffer.length == _length) {
135: char[] newBuffer = new char[2 * _buffer.length];
136: System.arraycopy(_buffer, 0, newBuffer, 0, _length);
137: _buffer = newBuffer;
138: }
139:
140: for (int i = _length; i >= 0; i--)
141: _buffer[i + 1] = _buffer[i];
142:
143: _length++;
144: _buffer[0] = ch;
145: }
146:
147: /**
148: * Read the next character, returning -1 on end of file..
149: */
150: public int read() throws IOException {
151: if (_offset < _length)
152: return _buffer[_offset++];
153: else
154: return _next.read();
155: }
156: }
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