Source Code Cross Referenced for XMLStringBuffer.java in  » 6.0-JDK-Modules » sjsxp » com » sun » xml » stream » xerces » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » sjsxp » com.sun.xml.stream.xerces.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Apache Software License, Version 1.1
003:         *
004:         *
005:         * Copyright (c) 1999-2002 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 com.sun.xml.stream.xerces.util;
059:
060:        import com.sun.xml.stream.xerces.xni.XMLString;
061:
062:        /**
063:         * XMLString is a structure used to pass character arrays. However,
064:         * XMLStringBuffer is a buffer in which characters can be appended
065:         * and extends XMLString so that it can be passed to methods
066:         * expecting an XMLString object. This is a safe operation because
067:         * it is assumed that any callee will <strong>not</strong> modify
068:         * the contents of the XMLString structure.
069:         * <p>
070:         * The contents of the string are managed by the string buffer. As
071:         * characters are appended, the string buffer will grow as needed.
072:         * <p>
073:         * <strong>Note:</strong> Never set the <code>ch</code>,
074:         * <code>offset</code>, and <code>length</code> fields directly.
075:         * These fields are managed by the string buffer. In order to reset
076:         * the buffer, call <code>clear()</code>.
077:         *
078:         * @author Andy Clark, IBM
079:         * @author Eric Ye, IBM
080:         *
081:         * @version $Id: XMLStringBuffer.java,v 1.2 2006/04/01 06:01:40 jeffsuttor Exp $
082:         */
083:        public class XMLStringBuffer extends XMLString {
084:
085:            //
086:            // Constants
087:            //
088:
089:            /** Default buffer size (32). */
090:            public static final int DEFAULT_SIZE = 32;
091:
092:            //
093:            // Data
094:            //
095:
096:            //
097:            // Constructors
098:            //
099:
100:            /**
101:             *
102:             */
103:            public XMLStringBuffer() {
104:                this (DEFAULT_SIZE);
105:            } // <init>()
106:
107:            /**
108:             *
109:             *
110:             * @param size
111:             */
112:            public XMLStringBuffer(int size) {
113:                ch = new char[size];
114:            } // <init>(int)
115:
116:            /** Constructs a string buffer from a char. */
117:            public XMLStringBuffer(char c) {
118:                this (1);
119:                append(c);
120:            } // <init>(char)
121:
122:            /** Constructs a string buffer from a String. */
123:            public XMLStringBuffer(String s) {
124:                this (s.length());
125:                append(s);
126:            } // <init>(String)
127:
128:            /** Constructs a string buffer from the specified character array. */
129:            public XMLStringBuffer(char[] ch, int offset, int length) {
130:                this (length);
131:                append(ch, offset, length);
132:            } // <init>(char[],int,int)
133:
134:            /** Constructs a string buffer from the specified XMLString. */
135:            public XMLStringBuffer(XMLString s) {
136:                this (s.length);
137:                append(s);
138:            } // <init>(XMLString)
139:
140:            //
141:            // Public methods
142:            //
143:
144:            /** Clears the string buffer. */
145:            public void clear() {
146:                offset = 0;
147:                length = 0;
148:            }
149:
150:            /**
151:             * append
152:             *
153:             * @param c
154:             */
155:            public void append(char c) {
156:                if (this .length + 1 > this .ch.length) {
157:                    int newLength = this .ch.length * 2;
158:                    if (newLength < this .ch.length + DEFAULT_SIZE) {
159:                        newLength = this .ch.length + DEFAULT_SIZE;
160:                    }
161:                    char[] tmp = new char[newLength];
162:                    System.arraycopy(this .ch, 0, tmp, 0, this .length);
163:                    this .ch = tmp;
164:                }
165:                this .ch[this .length] = c;
166:                this .length++;
167:            } // append(char)
168:
169:            /**
170:             * append
171:             *
172:             * @param s
173:             */
174:            public void append(String s) {
175:                int length = s.length();
176:                if (this .length + length > this .ch.length) {
177:                    int newLength = this .ch.length * 2;
178:                    if (newLength < this .ch.length + length + DEFAULT_SIZE) {
179:                        newLength = this .ch.length + length + DEFAULT_SIZE;
180:                    }
181:
182:                    char[] newch = new char[newLength];
183:                    System.arraycopy(this .ch, 0, newch, 0, this .length);
184:                    this .ch = newch;
185:                }
186:                s.getChars(0, length, this .ch, this .length);
187:                this .length += length;
188:            } // append(String)
189:
190:            /**
191:             * append
192:             *
193:             * @param ch
194:             * @param offset
195:             * @param length
196:             */
197:            public void append(char[] ch, int offset, int length) {
198:                if (this .length + length > this .ch.length) {
199:                    int newLength = this .ch.length * 2;
200:                    if (newLength < this .ch.length + length + DEFAULT_SIZE) {
201:                        newLength = this .ch.length + length + DEFAULT_SIZE;
202:                    }
203:                    char[] newch = new char[newLength];
204:                    System.arraycopy(this .ch, 0, newch, 0, this .length);
205:                    this .ch = newch;
206:                }
207:                //making the code more robust as it would handle null or 0 length data,
208:                //add the data only when it contains some thing
209:                if (ch != null && length > 0) {
210:                    System.arraycopy(ch, offset, this .ch, this .length, length);
211:                    this .length += length;
212:                }
213:            } // append(char[],int,int)
214:
215:            /**
216:             * append
217:             *
218:             * @param s
219:             */
220:            public void append(XMLString s) {
221:                append(s.ch, s.offset, s.length);
222:            } // append(XMLString)
223:
224:        } // class XMLStringBuffer
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