/*
 * Copyright (c) 2007 BUSINESS OBJECTS SOFTWARE LIMITED
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *  
 *     * 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.
 *  
 *     * Neither the name of Business Objects nor the names of its contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *  
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
 */


/*
 * NakedByteArrayOutputStream.java
 * Creation date: Nov 25, 2005.
 * By: Edward Lam
 */
package org.openquark.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;


/**
 * A ByteArrayOutputStream where the members are accessible via public methods and the modify methods are unsynchronized.
 * @author Edward Lam
 */
public final class NakedByteArrayOutputStream extends ByteArrayOutputStream {
    
    /**
     * Constructor for a NakedByteArrayOutputStream.
     */
    public NakedByteArrayOutputStream() {
        super();
    }
    /**
     * Constructor for a NakedByteArrayOutputStream.
     * @param size initial buffer capacity, in bytes.
     */
    public NakedByteArrayOutputStream(int size) {
        super(size);
    }
    
    /**
     * @return the backing byte array buffer.
     */
    public byte[] getByteArray() {
        return buf;
    }
    
    /**
     * @return The number of valid bytes in the buffer.
     */
    public int getCount() {
        return count;
    }
    
    /**
     * {@inheritDoc}
     */
    @Override
    public void write(int b) {
        int newcount = count + 1;
        if (newcount > buf.length) {
            byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
            System.arraycopy(buf, 0, newbuf, 0, count);
            buf = newbuf;
        }
        buf[count] = (byte)b;
        count = newcount;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void write(byte b[], int off, int len) {
        if ((off < 0) || (off > b.length) || (len < 0) ||
            ((off + len) > b.length) || ((off + len) < 0)) {
            throw new IndexOutOfBoundsException();
        } else if (len == 0) {
            return;
        }
        int newcount = count + len;
        if (newcount > buf.length) {
            byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
            System.arraycopy(buf, 0, newbuf, 0, count);
            buf = newbuf;
        }
        System.arraycopy(b, off, buf, count, len);
        count = newcount;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void writeTo(OutputStream out) throws IOException {
        out.write(buf, 0, count);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void reset() {
        count = 0;
    }
}