package com.trilead.ssh2.channel;

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

/**
 * ChannelOutputStream.
 *
 * @author Christian Plattner, plattner@trilead.com
 * @version $Id: ChannelOutputStream.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $
 */
public final class ChannelOutputStream extends OutputStream {
    Channel c;

    private byte[] writeBuffer;

    boolean isClosed = false;

    ChannelOutputStream(Channel c) {
        this.c = c;
        writeBuffer = new byte[1];
    }

    public void write(int b) throws IOException {
        writeBuffer[0] = (byte) b;
        write(writeBuffer, 0, 1);
    }

    public void close() throws IOException {
        if (isClosed == false) {
            isClosed = true;
            c.cm.sendEOF(c);
        }
    }

    public void flush() throws IOException {
        if (isClosed)
            throw new IOException("This OutputStream is closed.");

        /* This is a no-op, since this stream is unbuffered */
    }

    public void write(byte[] b, int off, int len) throws IOException {
        if (isClosed)
            throw new IOException("This OutputStream is closed.");

        if (b == null)
            throw new NullPointerException();

        if ((off < 0) || (len < 0) || ((off + len) > b.length) || ((off + len) < 0) || (off > b.length))
            throw new IndexOutOfBoundsException();

        if (len == 0)
            return;

        c.cm.sendData(c, b, off, len);
    }

    public void write(byte[] b) throws IOException {
        write(b, 0, b.length);
    }
}