Mercurial > hg > blitz_condensed
view src/com/go/trove/io/FileByteData.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
children |
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/* ==================================================================== * 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; } }