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/*******************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 
 *    Kohsuke Kawaguchi
 *
 *
 *******************************************************************************/ 

package hudson.util;

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

/**
 * {@link ByteArrayOutputStream} re-implementation.
 *
 *  This version allows one to read while writing is in progress.
 *
 * @author Kohsuke Kawaguchi
 * @deprecated since 2008-05-28. Moved to stapler
 */
public class ByteBuffer extends OutputStream {

    private byte[] buf = new byte[8192];
    /**
     * Size of the data.
     */
    private int size = 0;

    public synchronized void write(byte b[], int off, int len) throws IOException {
        ensureCapacity(len);
        System.arraycopy(b, off, buf, size, len);
        size += len;
    }

    public synchronized void write(int b) throws IOException {
        ensureCapacity(1);
        buf[size++] = (byte) b;
    }

    public synchronized long length() {
        return size;
    }

    private void ensureCapacity(int len) {
        if (buf.length - size > len) {
            return;
        }

        byte[] n = new byte[Math.max(buf.length * 2, size + len)];
        System.arraycopy(buf, 0, n, 0, size);
        this.buf = n;
    }

    public synchronized String toString() {
        return new String(buf, 0, size);
    }

    /**
     * Writes the contents of this buffer to another OutputStream.
     */
    public synchronized void writeTo(OutputStream os) throws IOException {
        os.write(buf, 0, size);
    }

    /**
     * Creates an {@link InputStream} that reads from the underlying buffer.
     */
    public InputStream newInputStream() {
        return new InputStream() {
            private int pos = 0;

            public int read() throws IOException {
                synchronized (ByteBuffer.this) {
                    if (pos >= size) {
                        return -1;
                    }
                    return buf[pos++];
                }
            }

            public int read(byte b[], int off, int len) throws IOException {
                synchronized (ByteBuffer.this) {
                    if (size == pos) {
                        return -1;
                    }

                    int sz = Math.min(len, size - pos);
                    System.arraycopy(buf, pos, b, off, sz);
                    pos += sz;
                    return sz;
                }
            }

            public int available() throws IOException {
                synchronized (ByteBuffer.this) {
                    return size - pos;
                }
            }

            public long skip(long n) throws IOException {
                synchronized (ByteBuffer.this) {
                    int diff = (int) Math.min(n, size - pos);
                    pos += diff;
                    return diff;
                }
            }
        };
    }
}