Mercurial > hg > blitz_condensed
diff src/org/prevayler/implementation/DelegatingByteCountStream.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/prevayler/implementation/DelegatingByteCountStream.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,120 @@ +/* + The copyright of all source code included in this Prevayler distribution is + held by Klaus Wuestefeld, except the files that specifically state otherwise. + All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld. + + + BSD License: + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + - Redistributions of source code must retain the above copyright notice, this + list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + - Neither the name of Prevayler nor the names of its contributors may be used + to endorse or promote products derived from this software without specific + prior written permission. + + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. +*/ + +package org.prevayler.implementation; + +import java.io.*; + +/** + A FileOutputStream that counts the number of bytes written and forces all + buffers to synchronize with the underlying device when flushed. +*/ +final class DelegatingByteCountStream extends OutputStream { + private OutputStream theBuffer; + private FileOutputStream theFile; + + + DelegatingByteCountStream(File file, int aBufferSize) + throws IOException { + + // System.err.println("Buffer size: " + aBufferSize); + + System.err.println("Open: " + file); + + theFile = new FileOutputStream(file); + + if (aBufferSize > 0) + theBuffer = new BufferedOutputStream(theFile, aBufferSize); + else + theBuffer = null; + } + + public void close() throws IOException { + // System.err.println("Close"); + + flush(); + getTopStream().close(); + } + + public void flush() throws IOException { + // System.err.println("Flush"); + + /* + "The flush method of OutputStream does nothing." - JDK1.3 API + documentation. I'm calling it just in case it starts doing + something in a future version of FileOutputStream or + OutputStream. + */ + getTopStream().flush(); + + /* + As we're JDK 1.4, this saves a bit of time because we don't + bother flushing meta data (we only care about flushing content) + */ + theFile.getChannel().force(false); + + // Original + // getFD().sync(); //"Force all system buffers to synchronize with the underlying device." - JDK1.3 API documentation. + } + + private OutputStream getTopStream() { + if (theBuffer == null) + return theFile; + else + return theBuffer; + } + + public void write(byte[] b) throws IOException { + getTopStream().write(b); + bytesWritten += b.length; + } + + public void write(byte[] b, int off, int len) throws IOException { + getTopStream().write(b, off, len); + bytesWritten += len; + } + + public void write(int b) throws IOException { + getTopStream().write(b); + ++bytesWritten; + } + + public long bytesWritten() { + return bytesWritten; + } + + private long bytesWritten; +}