Source Code Cross Referenced for BufferedOutputStream.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.util;
018:
019:        import java.io.FilterOutputStream;
020:        import java.io.IOException;
021:        import java.io.OutputStream;
022:
023:        /**
024:         * This class is like the {@link java.io.BufferedOutputStream} but it
025:         * extends it with a logic to count the number of bytes written to
026:         * the output stream.
027:         * 
028:         * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
029:         * @version CVS $Id: BufferedOutputStream.java 433543 2006-08-22 06:22:54Z crossley $
030:         * @since   2.1
031:         */
032:        public final class BufferedOutputStream extends FilterOutputStream {
033:
034:            protected byte buf[];
035:
036:            protected int count;
037:
038:            /**
039:             * Creates a new buffered output stream to write data to the 
040:             * specified underlying output stream with a default 8192-byte
041:             * buffer size.
042:             *
043:             * @param   out   the underlying output stream.
044:             */
045:            public BufferedOutputStream(OutputStream out) {
046:                this (out, 8192);
047:            }
048:
049:            /**
050:             * Creates a new buffered output stream to write data to the 
051:             * specified underlying output stream with the specified buffer 
052:             * size. 
053:             *
054:             * @param   out    the underlying output stream.
055:             * @param   size   the buffer size.
056:             * @exception IllegalArgumentException if size <= 0.
057:             */
058:            public BufferedOutputStream(OutputStream out, int size) {
059:                super (out);
060:                if (size <= 0) {
061:                    throw new IllegalArgumentException("Buffer size <= 0");
062:                }
063:                this .buf = new byte[size];
064:            }
065:
066:            /**
067:             * Writes the specified byte to this buffered output stream. 
068:             *
069:             * @param      b   the byte to be written.
070:             * @exception  IOException  if an I/O error occurs.
071:             */
072:            public void write(int b) throws IOException {
073:                if (this .count >= this .buf.length) {
074:                    this .incBuffer();
075:                }
076:                this .buf[count++] = (byte) b;
077:            }
078:
079:            /**
080:             * Writes <code>len</code> bytes from the specified byte array 
081:             * starting at offset <code>off</code> to this buffered output stream.
082:             *
083:             * <p> Ordinarily this method stores bytes from the given array into this
084:             * stream's buffer, flushing the buffer to the underlying output stream as
085:             * needed.  If the requested length is at least as large as this stream's
086:             * buffer, however, then this method will flush the buffer and write the
087:             * bytes directly to the underlying output stream.  Thus redundant
088:             * <code>BufferedOutputStream</code>s will not copy data unnecessarily.
089:             *
090:             * @param      b     the data.
091:             * @param      off   the start offset in the data.
092:             * @param      len   the number of bytes to write.
093:             * @exception  IOException  if an I/O error occurs.
094:             */
095:            public void write(byte b[], int off, int len) throws IOException {
096:                while (len > buf.length - count) {
097:                    this .incBuffer();
098:                }
099:                System.arraycopy(b, off, buf, count, len);
100:                count += len;
101:            }
102:
103:            /**
104:             * Flushes this buffered output stream. 
105:             * We don't flush here, flushing is done during closing.
106:             *
107:             * @exception  IOException  if an I/O error occurs.
108:             */
109:            public void flush() throws IOException {
110:                // nothing
111:            }
112:
113:            /**
114:             * Closes this buffered output stream.
115:             * Flush before closing.
116:             *
117:             * @exception  IOException  if an I/O error occurs.
118:             */
119:            public void close() throws IOException {
120:                realFlush();
121:                super .close();
122:            }
123:
124:            /**
125:             * Flushes this buffered output stream. 
126:             */
127:            public void realFlush() throws IOException {
128:                this .writeBuffer();
129:                this .out.flush();
130:            }
131:
132:            /**
133:             * Write the buffer
134:             */
135:            private void writeBuffer() throws IOException {
136:                if (this .count > 0) {
137:                    this .out.write(this .buf, 0, this .count);
138:                    this .clearBuffer();
139:                }
140:            }
141:
142:            /**
143:             * Increment the buffer
144:             */
145:            private void incBuffer() {
146:                // currently we double the buffer size
147:                // this is not so fast but is a very simple logic
148:                byte[] newBuf = new byte[this .buf.length * 2];
149:                System.arraycopy(this .buf, 0, newBuf, 0, this .buf.length);
150:                this .buf = newBuf;
151:            }
152:
153:            /**
154:             * Clear/reset the buffer
155:             */
156:            public void clearBuffer() {
157:                this .count = 0;
158:            }
159:
160:            /**
161:             * Return the size of the current buffer
162:             */
163:            public int getCount() {
164:                return this.count;
165:            }
166:        }
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