Mercurial > hg > truffle
diff graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.sun.max.io; + +import java.io.*; + +/** + * A {@link ByteArrayOutputStream} that can have its write position {@linkplain #seek(int) updated}. + */ +public class SeekableByteArrayOutputStream extends ByteArrayOutputStream { + + private int highestCount; + + /** + * @see ByteArrayOutputStream#ByteArrayOutputStream() + */ + public SeekableByteArrayOutputStream() { + } + + /** + * @see ByteArrayOutputStream#ByteArrayOutputStream(int) + */ + public SeekableByteArrayOutputStream(int size) { + super(size); + } + + /** + * Updates the write position of this stream. The stream can only be repositioned between 0 and the + * {@linkplain #endOfStream() end of the stream}. + * + * @param index + * the index to which the write position of this stream will be set + * @throws IllegalArgumentException + * if {@code index > highestSeekIndex()} + */ + public void seek(int index) throws IllegalArgumentException { + if (endOfStream() < index) { + throw new IllegalArgumentException(); + } + count = index; + } + + /** + * Gets the index one past the highest index that has been written to in this stream. + */ + public int endOfStream() { + if (highestCount < count) { + highestCount = count; + } + return highestCount; + } + + @Override + public void reset() { + super.reset(); + highestCount = 0; + } + + /** + * Copies the {@code length} bytes of this byte array output stream starting at {@code offset} to {@code buf} + * starting at {@code bufOffset}. + */ + public void copyTo(int offset, byte[] toBuffer, int toOffset, int length) { + System.arraycopy(this.buf, offset, toBuffer, toOffset, length); + } +}