Mercurial > hg > truffle
view graal/com.oracle.max.base/src/com/sun/max/io/SeekableByteArrayOutputStream.java @ 4213:e4cfa571d8c4
Do not emit stack-to-stack moves.
author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Tue, 03 Jan 2012 18:47:27 -0800 |
parents | bc8527f3071c |
children |
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/* * 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 synchronized 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); } }