Source Code Cross Referenced for PipedOutputStream.java in  » Science » Cougaar12_4 » org » cougaar » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * <copyright>
003:         *  
004:         *  Copyright 1997-2004 BBNT Solutions, LLC
005:         *  under sponsorship of the Defense Advanced Research Projects
006:         *  Agency (DARPA).
007:         * 
008:         *  You can redistribute this software and/or modify it under the
009:         *  terms of the Cougaar Open Source License as published on the
010:         *  Cougaar Open Source Website (www.cougaar.org).
011:         * 
012:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
013:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
014:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
015:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
016:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
018:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
019:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
020:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
021:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
022:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
023:         *  
024:         * </copyright>
025:         */
026:
027:        package org.cougaar.util;
028:
029:        import java.io.IOException;
030:
031:        /**
032:         * An efficient implementation of PipedOutputStream
033:         **/
034:        public class PipedOutputStream extends java.io.OutputStream {
035:            /**
036:             * The PipedInputStream this is connected to.
037:             **/
038:            private PipedInputStream pis;
039:            /**
040:             * Set if this stream has been closed
041:             **/
042:            private boolean closed = false;
043:
044:            /**
045:             * Create an unconnected PipedOutputStream. To be used this must be
046:             * passed to a new PipedInputStream or a new PipedInputStream must
047:             * be connected to this.
048:             **/
049:            public PipedOutputStream() {
050:            }
051:
052:            /**
053:             * Create an PipedOutputStream connected to the given
054:             * PipedInputStream. The pair of streams is immediately ready to be
055:             * used if this constructor is used.
056:             * @param pis the PipedInputStream to connect to this.
057:             **/
058:            public PipedOutputStream(PipedInputStream pis) {
059:                this .pis = pis;
060:            }
061:
062:            /**
063:             * Connect an PipedInputStream to this. This must be unconnected.
064:             * @param pis the PipedInputStream to connect.
065:             **/
066:            public synchronized void connect(PipedInputStream pis) {
067:                if (this .pis != null && this .pis != pis) {
068:                    throw new IllegalArgumentException("Already connected");
069:                }
070:                this .pis = pis;
071:            }
072:
073:            /**
074:             * Write a byte to the pipe. The byte is put into the connected
075:             * PipedInputStream.
076:             * @param b the byte to put.
077:             * @exception IOException if this stream is closed or not connected
078:             * or connected to a closed PipedInputStream.
079:             **/
080:            public synchronized void write(int b) throws IOException {
081:                if (closed)
082:                    throw new IOException("Closed");
083:                if (pis == null)
084:                    throw new IOException("Not Connected");
085:                pis.put(b);
086:            }
087:
088:            /**
089:             * Write an array of bytes to the pipe. All the bytes in the array
090:             * are put into the connected PipedInputStream.
091:             * @param b the byte to put.
092:             * @exception IOException if this stream is closed or not connected
093:             * or connected to a closed PipedInputStream.
094:             **/
095:            public synchronized void write(byte[] b, int off, int len)
096:                    throws IOException {
097:                if (closed)
098:                    throw new IOException("Closed");
099:                if (pis == null)
100:                    throw new IOException("Not Connected");
101:                pis.put(b, off, len);
102:            }
103:
104:            /**
105:             * Write part of an array of bytes to the pipe. Some of the bytes in
106:             * the array are put into the connected PipedInputStream.
107:             * @param b the byte to put.
108:             * @exception IOException if this stream is closed or not connected
109:             * or connected to a closed PipedInputStream.
110:             **/
111:            public synchronized void write(byte[] b) throws IOException {
112:                if (closed)
113:                    throw new IOException("Closed");
114:                if (pis == null)
115:                    throw new IOException("Not Connected");
116:                pis.put(b, 0, b.length);
117:            }
118:
119:            /**
120:             * Insure that all bytes that have been written are accessible to
121:             * the reader of the connected PipedInputStream.
122:             * @exception IOException if this stream is closed or not connected.
123:             **/
124:            public synchronized void flush() throws IOException {
125:                if (closed)
126:                    throw new IOException("Closed");
127:                if (pis == null)
128:                    throw new IOException("Not Connected");
129:                pis.flush();
130:            }
131:
132:            /**
133:             * Close this stream. The connection PipedInputStream will signal
134:             * EOF when all the bytes have been read.
135:             * @exception IOException if this stream is already closed
136:             **/
137:            public synchronized void close() throws IOException {
138:                if (closed)
139:                    throw new IOException("Closed");
140:                if (pis != null) {
141:                    pis.setEOF();
142:                }
143:                closed = true;
144:            }
145:        }
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