001: /*
002: * The Apache Software License, Version 1.1
003: *
004: *
005: * Copyright (c) 1999 The Apache Software Foundation. All rights
006: * reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: *
012: * 1. Redistributions of source code must retain the above copyright
013: * notice, this list of conditions and the following disclaimer.
014: *
015: * 2. Redistributions in binary form must reproduce the above copyright
016: * notice, this list of conditions and the following disclaimer in
017: * the documentation and/or other materials provided with the
018: * distribution.
019: *
020: * 3. The end-user documentation included with the redistribution,
021: * if any, must include the following acknowledgment:
022: * "This product includes software developed by the
023: * Apache Software Foundation (http://www.apache.org/)."
024: * Alternately, this acknowledgment may appear in the software itself,
025: * if and wherever such third-party acknowledgments normally appear.
026: *
027: * 4. The names "Xerces" and "Apache Software Foundation" must
028: * not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact apache@apache.org.
031: *
032: * 5. Products derived from this software may not be called "Apache",
033: * nor may "Apache" appear in their name, without prior written
034: * permission of the Apache Software Foundation.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: * ====================================================================
049: *
050: * This software consists of voluntary contributions made by many
051: * individuals on behalf of the Apache Software Foundation and was
052: * originally based on software copyright (c) 1999, International
053: * Business Machines, Inc., http://www.apache.org. For more
054: * information on the Apache Software Foundation, please see
055: * <http://www.apache.org/>.
056: */
057:
058: package org.apache.xerces.utils;
059:
060: import org.apache.xerces.readers.XMLEntityHandler;
061:
062: /**
063: *
064: * @version
065: */
066: public final class ChunkyCharArray implements
067: XMLEntityHandler.CharBuffer {
068:
069: /**
070: * Constructor
071: */
072: public ChunkyCharArray(StringPool stringPool) {
073: fStringPool = stringPool;
074: fCurrentChunk = CharDataChunk.createChunk(stringPool, null);
075: }
076:
077: /**
078: *
079: */
080: public int length() {
081: return fLength;
082: }
083:
084: /**
085: *
086: */
087: public void append(char ch) {
088: try {
089: fCurrentData[fCurrentIndex] = ch;
090: } catch (ArrayIndexOutOfBoundsException ex) {
091: if (fCurrentIndex == CharDataChunk.CHUNK_SIZE) {
092: fCurrentChunk = CharDataChunk.createChunk(fStringPool,
093: fCurrentChunk);
094: fCurrentData = new char[INITIAL_CHUNK_SIZE];
095: fCurrentIndex = 0;
096: } else {
097: char[] newData = new char[fCurrentIndex * 2];
098: System.arraycopy(fCurrentData, 0, newData, 0,
099: fCurrentIndex);
100: fCurrentData = newData;
101: }
102: fCurrentChunk.setCharArray(fCurrentData);
103: fCurrentData[fCurrentIndex] = ch;
104: } catch (NullPointerException ex) {
105: fCurrentData = new char[INITIAL_CHUNK_SIZE];
106: fCurrentChunk.setCharArray(fCurrentData);
107: fCurrentData[fCurrentIndex] = ch;
108: }
109: fCurrentIndex++;
110: fLength++;
111: }
112:
113: /**
114: * Append a <code>String</code> to this buffer
115: *
116: * @param s the string to append.
117: */
118: public void append(String s) {
119: int slen = s.length();
120: for (int i = 0; i < slen; i++)
121: append(s.charAt(i));
122: }
123:
124: /**
125: *
126: */
127: public void append(char[] ch, int offset, int length) {
128: while (length-- > 0)
129: append(ch[offset++]);
130: }
131:
132: /**
133: * Append a <code>ChunkyCharArray</code> to this buffer.
134: *
135: * @param charArray buffer to be appended.
136: * @param offset The offset within charArray of the first character.
137: * @param length The number of characters to append.
138: */
139: public void append(ChunkyCharArray charArray, int offset, int length) {
140: fCurrentChunk.append(charArray, offset, length);
141: }
142:
143: /**
144: *
145: */
146: public int addString(int offset, int length) {
147: if (length == 0)
148: return 0;
149: return fCurrentChunk.addString(offset, length);
150: }
151:
152: /**
153: * Add a region of this buffer to the <code>StringPool</code> as a symbol
154: *
155: * @param offset The offset within this buffer of the first character of the string
156: * @param length The number of characters in the symbol
157: */
158: public int addSymbol(int offset, int length) {
159: if (length == 0)
160: return 0;
161: return fCurrentChunk.addSymbol(offset, length, 0);
162: }
163:
164: //
165: // Chunk size constants
166: //
167: private static final int INITIAL_CHUNK_SHIFT = 7; // 2^7 = 128
168: private static final int INITIAL_CHUNK_SIZE = (1 << INITIAL_CHUNK_SHIFT);
169:
170: //
171: // Instance variables
172: //
173: private StringPool fStringPool = null;
174: private CharDataChunk fCurrentChunk = null;
175: private char[] fCurrentData = null;
176: private int fCurrentIndex = 0;
177: private int fLength = 0;
178: }
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