NullChannel.java

/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2008 Charles O Nutter <headius@headius.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
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 ***** END LICENSE BLOCK *****/
package org.jruby.util.io;

import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

/**
 *
 * @author headius
 */
public class NullChannel implements WritableByteChannel, ReadableByteChannel {
    private boolean isOpen = true;

    public int write(ByteBuffer buffer) throws IOException {
        if (!isOpen) {
            throw new EOFException();
        }
        int length = buffer.remaining();
        buffer.position(buffer.position() + length);
        return length;
    }

    public boolean isOpen() {
        return isOpen;
    }

    public void close() throws IOException {
        isOpen = false;
    }

    public int read(ByteBuffer dst) throws IOException {
        if (!isOpen) {
            throw new EOFException();
        }
        return -1;
    }
}