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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 1999-2002 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.
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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.
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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 com.sun.org.apache.xerces.internal.util;
59
60 import com.sun.org.apache.xerces.internal.xni.XMLString;
61
62 /**
63  * XMLString is a structure used to pass character arrays. However,
64  * XMLStringBuffer is a buffer in which characters can be appended
65  * and extends XMLString so that it can be passed to methods
66  * expecting an XMLString object. This is a safe operation because
67  * it is assumed that any callee will <strong>not</strong> modify
68  * the contents of the XMLString structure.
69  * <p>
70  * The contents of the string are managed by the string buffer. As
71  * characters are appended, the string buffer will grow as needed.
72  * <p>
73  * <strong>Note:</strong> Never set the <code>ch</code>,
74  * <code>offset</code>, and <code>length</code> fields directly.
75  * These fields are managed by the string buffer. In order to reset
76  * the buffer, call <code>clear()</code>.
77  *
78  * @author Andy Clark, IBM
79  * @author Eric Ye, IBM
80  *
81  * @version $Id: XMLStringBuffer.java,v 1.5 2003/07/28 23:27:36 elena Exp $
82  */
83 public class XMLStringBuffer
84     extends XMLString {
85
86     //
87 // Constants
88 //
89
90     /** Default buffer size (32). */
91     public static final int DEFAULT_SIZE = 32;
92
93     //
94 // Constructors
95 //
96
97     /**
98      *
99      */
100     public XMLStringBuffer() {
101         this(DEFAULT_SIZE);
102     } // <init>()
103
104     /**
105      *
106      *
107      * @param size
108      */
109     public XMLStringBuffer(int size) {
110         ch = new char[size];
111     } // <init>(int)
112
113     /** Constructs a string buffer from a char. */
114     public XMLStringBuffer(char c) {
115         this(1);
116         append(c);
117     } // <init>(char)
118
119     /** Constructs a string buffer from a String. */
120     public XMLStringBuffer(String JavaDoc s) {
121         this(s.length());
122         append(s);
123     } // <init>(String)
124
125     /** Constructs a string buffer from the specified character array. */
126     public XMLStringBuffer(char[] ch, int offset, int length) {
127         this(length);
128         append(ch, offset, length);
129     } // <init>(char[],int,int)
130
131     /** Constructs a string buffer from the specified XMLString. */
132     public XMLStringBuffer(XMLString s) {
133         this(s.length);
134         append(s);
135     } // <init>(XMLString)
136
137     //
138 // Public methods
139 //
140
141     /** Clears the string buffer. */
142     public void clear() {
143         offset = 0;
144         length = 0;
145     }
146
147     /**
148      * append
149      *
150      * @param c
151      */
152     public void append(char c) {
153         if (this.length + 1 > this.ch.length) {
154                     int newLength = this.ch.length*2;
155                     if (newLength < this.ch.length + DEFAULT_SIZE)
156                         newLength = this.ch.length + DEFAULT_SIZE;
157                     char[] newch = new char[newLength];
158                     System.arraycopy(this.ch, 0, newch, 0, this.length);
159                     this.ch = newch;
160         }
161         this.ch[this.length] = c;
162         this.length++;
163     } // append(char)
164
165     /**
166      * append
167      *
168      * @param s
169      */
170     public void append(String JavaDoc s) {
171         int length = s.length();
172         if (this.length + length > this.ch.length) {
173             int newLength = this.ch.length*2;
174             if (newLength < this.length + length + DEFAULT_SIZE)
175                 newLength = this.ch.length + length + DEFAULT_SIZE;
176             char[] newch = new char[newLength];
177             System.arraycopy(this.ch, 0, newch, 0, this.length);
178             this.ch = newch;
179         }
180         s.getChars(0, length, this.ch, this.length);
181         this.length += length;
182     } // append(String)
183
184     /**
185      * append
186      *
187      * @param ch
188      * @param offset
189      * @param length
190      */
191     public void append(char[] ch, int offset, int length) {
192         if (this.length + length > this.ch.length) {
193             char[] newch = new char[this.ch.length + length + DEFAULT_SIZE];
194             System.arraycopy(this.ch, 0, newch, 0, this.length);
195             this.ch = newch;
196         }
197         System.arraycopy(ch, offset, this.ch, this.length, length);
198         this.length += length;
199     } // append(char[],int,int)
200
201     /**
202      * append
203      *
204      * @param s
205      */
206     public void append(XMLString s) {
207         append(s.ch, s.offset, s.length);
208     } // append(XMLString)
209
210 } // class XMLStringBuffer
211
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