Mercurial > hg > blitz_condensed
diff src/com/go/trove/io/FileByteData.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/com/go/trove/io/FileByteData.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,167 @@ +/* ==================================================================== + * Trove - Copyright (c) 1999-2000 Walt Disney Internet Group + * ==================================================================== + * The Tea Software License, Version 1.1 + * + * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Walt Disney Internet Group (http://opensource.go.com/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact opensource@dig.com. + * + * 5. Products derived from this software may not be called "Tea", + * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", + * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior + * written permission of the Walt Disney Internet Group. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 WALT DISNEY INTERNET GROUP OR ITS + * 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. + * ==================================================================== + * + * For more information about Tea, please see http://opensource.go.com/. + */ + +package com.go.trove.io; + +import java.io.OutputStream; +import java.io.File; +import java.io.RandomAccessFile; +import java.io.IOException; + +/****************************************************************************** + * A ByteData implementation that reads the contents of a file. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/06 <!-- $--> + */ +public class FileByteData implements ByteData { + private static final Object NULL = new Object(); + + private File mFile; + + // Thread-local reference to a RandomAccessFile. + private ThreadLocal mRAF = new ThreadLocal(); + + public FileByteData(File file) { + mFile = file; + // Open here so that if file isn't found, error is logged earlier. + open(); + } + + public long getByteCount() throws IOException { + // Keep file open to ensure that length doesn't change between call to + // getByteCount and writeTo. + + RandomAccessFile raf = open(); + if (raf == null) { + return 0; + } + else { + return raf.length(); + } + } + + public void writeTo(OutputStream out) throws IOException { + RandomAccessFile raf = open(); + if (raf == null) { + return; + } + + try { + long length = raf.length(); + int bufSize; + if (length > 4000) { + bufSize = 4000; + } + else { + bufSize = (int)length; + } + + byte[] inputBuffer = new byte[bufSize]; + + raf.seek(0); + + int readAmount; + while ((readAmount = raf.read(inputBuffer, 0, bufSize)) > 0) { + out.write(inputBuffer, 0, readAmount); + } + } + finally { + try { + finalize(); + } + catch (IOException e) { + } + } + } + + public void reset() throws IOException { + Object obj = mRAF.get(); + try { + if (obj instanceof RandomAccessFile) { + ((RandomAccessFile)obj).close(); + } + } + finally { + mRAF.set(null); + } + } + + protected final void finalize() throws IOException { + reset(); + } + + private RandomAccessFile open() { + Object obj = mRAF.get(); + if (obj instanceof RandomAccessFile) { + return (RandomAccessFile)obj; + } + else if (obj == NULL) { + return null; + } + + RandomAccessFile raf = null; + + try { + raf = new RandomAccessFile(mFile, "r"); + mRAF.set(raf); + } + catch (IOException e) { + mRAF.set(NULL); + Thread t = Thread.currentThread(); + t.getThreadGroup().uncaughtException(t, e); + } + + return raf; + } +}