Source Code Cross Referenced for Writer.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:         *   
003:         *
004:         * Copyright  1990-2007 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:        package java.io;
028:
029:        /**
030:         * Abstract class for writing to character streams.  The only methods that a
031:         * subclass must implement are write(char[], int, int), flush(), and close().
032:         * Most subclasses, however, will override some of the methods defined here in
033:         * order to provide higher efficiency, additional functionality, or both.
034:         *
035:         * @version 12/17/01 (CLDC 1.1)
036:         * @since   JDK1.1, CLDC 1.0
037:         * @see     java.io.OutputStreamWriter
038:         * @see     java.io.Reader
039:         */
040:
041:        public abstract class Writer {
042:
043:            /**
044:             * Temporary buffer used to hold writes of strings and single characters
045:             */
046:            private char[] writeBuffer;
047:
048:            /**
049:             * Size of writeBuffer, must be >= 1
050:             */
051:            private final int writeBufferSize = 1024;
052:
053:            /**
054:             * The object used to synchronize operations on this stream.  For
055:             * efficiency, a character-stream object may use an object other than
056:             * itself to protect critical sections.  A subclass should therefore use
057:             * the object in this field rather than <tt>this</tt> or a synchronized
058:             * method.
059:             */
060:            protected Object lock;
061:
062:            /**
063:             * Create a new character-stream writer whose critical sections will
064:             * synchronize on the writer itself.
065:             */
066:            protected Writer() {
067:                this .lock = this ;
068:            }
069:
070:            /**
071:             * Create a new character-stream writer whose critical sections will
072:             * synchronize on the given object.
073:             *
074:             * @param lock  Object to synchronize on.
075:             */
076:            protected Writer(Object lock) {
077:                if (lock == null) {
078:                    throw new NullPointerException();
079:                }
080:                this .lock = lock;
081:            }
082:
083:            /**
084:             * Write a single character.  The character to be written is contained in
085:             * the 16 low-order bits of the given integer value; the 16 high-order bits
086:             * are ignored.
087:             *
088:             * <p> Subclasses that intend to support efficient single-character output
089:             * should override this method.
090:             *
091:             * @param c  int specifying a character to be written.
092:             * @exception  IOException  If an I/O error occurs
093:             */
094:            public void write(int c) throws IOException {
095:                synchronized (lock) {
096:                    if (writeBuffer == null) {
097:                        writeBuffer = new char[writeBufferSize];
098:                    }
099:                    writeBuffer[0] = (char) c;
100:                    write(writeBuffer, 0, 1);
101:                }
102:            }
103:
104:            /**
105:             * Write an array of characters.
106:             *
107:             * @param  cbuf  Array of characters to be written
108:             * 
109:             * @exception  IOException  If an I/O error occurs
110:             */
111:            public void write(char cbuf[]) throws IOException {
112:                write(cbuf, 0, cbuf.length);
113:            }
114:
115:            /**
116:             * Write a portion of an array of characters.
117:             *
118:             * @param  cbuf  Array of characters
119:             * @param  off   Offset from which to start writing characters
120:             * @param  len   Number of characters to write
121:             *
122:             * @exception  IOException  If an I/O error occurs
123:             */
124:            abstract public void write(char cbuf[], int off, int len)
125:                    throws IOException;
126:
127:            /**
128:             * Write a string.
129:             *
130:             * @param  str  String to be written
131:             *
132:             * @exception  IOException  If an I/O error occurs
133:             */
134:            public void write(String str) throws IOException {
135:                write(str, 0, str.length());
136:            }
137:
138:            /**
139:             * Write a portion of a string.
140:             *
141:             * @param  str  A String
142:             * @param  off  Offset from which to start writing characters
143:             * @param  len  Number of characters to write
144:             *
145:             * @exception  IOException  If an I/O error occurs
146:             */
147:            public void write(String str, int off, int len) throws IOException {
148:                synchronized (lock) {
149:                    char cbuf[];
150:                    if (len <= writeBufferSize) {
151:                        if (writeBuffer == null) {
152:                            writeBuffer = new char[writeBufferSize];
153:                        }
154:                        cbuf = writeBuffer;
155:                    } else { // Don't permanently allocate very large buffers.
156:                        cbuf = new char[len];
157:                    }
158:                    str.getChars(off, (off + len), cbuf, 0);
159:                    write(cbuf, 0, len);
160:                }
161:            }
162:
163:            /**
164:             * Flush the stream.  If the stream has saved any characters from the
165:             * various write() methods in a buffer, write them immediately to their
166:             * intended destination.  Then, if that destination is another character or
167:             * byte stream, flush it.  Thus one flush() invocation will flush all the
168:             * buffers in a chain of Writers and OutputStreams.
169:             *
170:             * @exception  IOException  If an I/O error occurs
171:             */
172:            abstract public void flush() throws IOException;
173:
174:            /**
175:             * Close the stream, flushing it first.  Once a stream has been closed,
176:             * further write() or flush() invocations will cause an IOException to be
177:             * thrown.  Closing a previously-closed stream, however, has no effect.
178:             *
179:             * @exception  IOException  If an I/O error occurs
180:             */
181:            abstract public void close() throws IOException;
182:
183:        }
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