Source Code Cross Referenced for StringWriter.java in  » 6.0-JDK-Modules » j2me » java » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)StringWriter.java	1.25 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.io;
029:
030:        /**
031:         * A character stream that collects its output in a string buffer, which can
032:         * then be used to construct a string.
033:         * <p>
034:         * Closing a <tt>StringWriter</tt> has no effect. The methods in this class
035:         * can be called after the stream has been closed without generating an
036:         * <tt>IOException</tt>.
037:         *
038:         * @version 	1.18, 00/02/02
039:         * @author	Mark Reinhold
040:         * @since	JDK1.1
041:         */
042:
043:        public class StringWriter extends Writer {
044:
045:            private StringBuffer buf;
046:
047:            /**
048:             * Create a new string writer, using the default initial string-buffer
049:             * size.
050:             */
051:            public StringWriter() {
052:                buf = new StringBuffer();
053:                lock = buf;
054:            }
055:
056:            /**
057:             * Create a new string writer, using the specified initial string-buffer
058:             * size.
059:             *
060:             * @param initialSize  an int specifying the initial size of the buffer.
061:             */
062:            public StringWriter(int initialSize) {
063:                if (initialSize < 0) {
064:                    throw new IllegalArgumentException("Negative buffer size");
065:                }
066:                buf = new StringBuffer(initialSize);
067:                lock = buf;
068:            }
069:
070:            /**
071:             * Write a single character.
072:             */
073:            public void write(int c) {
074:                buf.append((char) c);
075:            }
076:
077:            /**
078:             * Write a portion of an array of characters.
079:             *
080:             * @param  cbuf  Array of characters
081:             * @param  off   Offset from which to start writing characters
082:             * @param  len   Number of characters to write
083:             */
084:            public void write(char cbuf[], int off, int len) {
085:                if ((off < 0) || (off > cbuf.length) || (len < 0)
086:                        || ((off + len) > cbuf.length) || ((off + len) < 0)) {
087:                    throw new IndexOutOfBoundsException();
088:                } else if (len == 0) {
089:                    return;
090:                }
091:                buf.append(cbuf, off, len);
092:            }
093:
094:            /**
095:             * Write a string.
096:             */
097:            public void write(String str) {
098:                buf.append(str);
099:            }
100:
101:            /**
102:             * Write a portion of a string.
103:             *
104:             * @param  str  String to be written
105:             * @param  off  Offset from which to start writing characters
106:             * @param  len  Number of characters to write
107:             */
108:            public void write(String str, int off, int len) {
109:                buf.append(str.substring(off, off + len));
110:            }
111:
112:            /**
113:             * Return the buffer's current value as a string.
114:             */
115:            public String toString() {
116:                return buf.toString();
117:            }
118:
119:            /**
120:             * Return the string buffer itself.
121:             *
122:             * @return StringBuffer holding the current buffer value.
123:             */
124:            public StringBuffer getBuffer() {
125:                return buf;
126:            }
127:
128:            /**
129:             * Flush the stream.
130:             */
131:            public void flush() {
132:            }
133:
134:            /**
135:             * Closing a <tt>StringWriter</tt> has no effect. The methods in this
136:             * class can be called after the stream has been closed without generating
137:             * an <tt>IOException</tt>.
138:             */
139:            public void close() throws IOException {
140:            }
141:
142:        }
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