Immutable byte list : byte « Data Type « Java

Immutable byte list

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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
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 * @xerces.internal 
 * @author Ankit Pasricha, IBM
 * @version $Id: 446747 2006-09-15 21:46:20Z mrglavas $
public class ByteListImpl {

    // actually data stored in a byte array
    protected final byte[] data;
    // canonical representation of the data
    protected String canonical;
    public ByteListImpl(byte[] data) { = data;
     * The number of <code>byte</code>s in the list. The range of 
     * valid child object indices is 0 to <code>length-1</code> inclusive. 
    public int getLength() {
        return data.length;

     * Checks if the <code>byte</code> <code>item</code> is a 
     * member of this list. 
     * @param item  <code>byte</code> whose presence in this list 
     *   is to be tested. 
     * @return  True if this list contains the <code>byte</code> 
     *   <code>item</code>. 
    public boolean contains(byte item) {
        for (int i = 0; i < data.length; ++i) {
            if (data[i] == item) {
                return true;
        return false;

     * Returns the <code>index</code>th item in the collection. The index 
     * starts at 0. 
     * @param index  index into the collection. 
     * @return  The <code>byte</code> at the <code>index</code>th 
     *   position in the <code>ByteList</code>. 
     * @exception XSException
     *   INDEX_SIZE_ERR: if <code>index</code> is greater than or equal to the 
     *   number of objects in the list.
    public byte item(int index) 
        throws Exception {
        if(index < 0 || index > data.length - 1) {
            throw new RuntimeException("INDEX SIZE ERR");
        return data[index];


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