--- /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;
+    }
+}