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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 1999 The Apache Software Foundation. All rights
6  * reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Xerces" and "Apache Software Foundation" must
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
31  *
32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  * ====================================================================
49  *
50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 1999, International
53  * Business Machines, Inc., http://www.apache.org. For more
54  * information on the Apache Software Foundation, please see
55  * <http://www.apache.org/>.
56  */
57
58 package org.enhydra.apache.xerces.utils;
59
60 import org.enhydra.apache.xerces.readers.XMLEntityHandler;
61
62 /**
63  *
64  * @version
65  */
66 public final class ChunkyCharArray implements XMLEntityHandler.CharBuffer {
67
68     /**
69      * Constructor
70      */
71     public ChunkyCharArray(StringPool stringPool) {
72         fStringPool = stringPool;
73         fCurrentChunk = CharDataChunk.createChunk(stringPool, null);
74     }
75
76     /**
77      *
78      */
79     public int length() {
80         return fLength;
81     }
82
83     /**
84      *
85      */
86     public void append(char ch) {
87         try {
88             fCurrentData[fCurrentIndex] = ch;
89         } catch (ArrayIndexOutOfBoundsException JavaDoc ex) {
90             if (fCurrentIndex == CharDataChunk.CHUNK_SIZE) {
91                 fCurrentChunk = CharDataChunk.createChunk(fStringPool, fCurrentChunk);
92                 fCurrentData = new char[INITIAL_CHUNK_SIZE];
93                 fCurrentIndex = 0;
94             } else {
95                 char[] newData = new char[fCurrentIndex * 2];
96                 System.arraycopy(fCurrentData, 0, newData, 0, fCurrentIndex);
97                 fCurrentData = newData;
98             }
99             fCurrentChunk.setCharArray(fCurrentData);
100             fCurrentData[fCurrentIndex] = ch;
101         } catch (NullPointerException JavaDoc ex) {
102             fCurrentData = new char[INITIAL_CHUNK_SIZE];
103             fCurrentChunk.setCharArray(fCurrentData);
104             fCurrentData[fCurrentIndex] = ch;
105         }
106         fCurrentIndex++;
107         fLength++;
108     }
109
110     /**
111      * Append a <code>String</code> to this buffer
112      *
113      * @param s the string to append.
114      */
115     public void append(String JavaDoc s) {
116         int slen = s.length();
117         for (int i = 0; i < slen; i++)
118             append(s.charAt(i));
119     }
120
121     /**
122      *
123      */
124     public void append(char[] ch, int offset, int length) {
125         while (length-- > 0)
126             append(ch[offset++]);
127     }
128
129     /**
130      * Append a <code>ChunkyCharArray</code> to this buffer.
131      *
132      * @param charArray buffer to be appended.
133      * @param offset The offset within charArray of the first character.
134      * @param length The number of characters to append.
135      */
136     public void append(ChunkyCharArray charArray, int offset, int length) {
137         fCurrentChunk.append(charArray, offset, length);
138     }
139
140     /**
141      *
142      */
143     public int addString(int offset, int length) {
144         if (length == 0)
145             return 0;
146         return fCurrentChunk.addString(offset, length);
147     }
148
149     /**
150      * Add a region of this buffer to the <code>StringPool</code> as a symbol
151      *
152      * @param offset The offset within this buffer of the first character of the string
153      * @param length The number of characters in the symbol
154      */
155     public int addSymbol(int offset, int length) {
156         if (length == 0)
157             return 0;
158         return fCurrentChunk.addSymbol(offset, length, 0);
159     }
160
161     //
162 // Chunk size constants
163 //
164 private static final int INITIAL_CHUNK_SHIFT = 7; // 2^7 = 128
165 private static final int INITIAL_CHUNK_SIZE = (1 << INITIAL_CHUNK_SHIFT);
166
167     //
168 // Instance variables
169 //
170 private StringPool fStringPool = null;
171     private CharDataChunk fCurrentChunk = null;
172     private char[] fCurrentData = null;
173     private int fCurrentIndex = 0;
174     private int fLength = 0;
175 }
176
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