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eXist-db NoSQL Database Core
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/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.util;

import java.nio.ByteBuffer;

public class FixedByteArray implements ByteArray {

	private byte[] data;
	private int start;
	private int len;
	
	public FixedByteArray(byte[] data, int start, int len) {
		this.data = data;
		this.start = start;
		this.len = len;
	}

    public FixedByteArray(byte[] data) {
        this(data, 0, data.length);
    }
    
	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#setLength(int)
	 */
	public void setLength(int len) {
		throw new RuntimeException("cannot modify fixed byte array");
	}

    public String toString() {
        return new String(data, start, len);
    }

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#copyTo(byte[], int)
	 */
	public void copyTo(byte[] b, int offset) {
		System.arraycopy(data, start, b, offset, len);
	}

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#copyTo(int, byte[], int, int)
	 */
	public void copyTo(int startOffset, byte[] newBuf, int offset, int count) {
		System.arraycopy(data, start + startOffset, newBuf, offset, count);
	}

	public void copyTo(ByteArray other) {
	    other.append(data, start, len);
	}
	
    public void copyTo(ByteBuffer buf) {
        buf.put(data, start, len);
    }
    
	public void copyTo(int startOffset, ByteBuffer buf, int count) {
		buf.put(data, start + startOffset, count);
	}
	
	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#append(byte)
	 */
	public void append(byte b) {
		throw new RuntimeException("cannot modify fixed byte array");
	}

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#append(byte[])
	 */
	public void append(byte[] b) {
		throw new RuntimeException("cannot modify fixed byte array");
	}

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#append(byte[], int, int)
	 */
	public void append(byte[] b, int offset, int length) {
		throw new RuntimeException("cannot modify fixed byte array");
	}

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#size()
	 */
	public int size() {
		return len;
	}

	/* (non-Javadoc)
	 * @see org.exist.util.ByteArray#release()
	 */
	public void release() {
	}

}