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package com.sun.org.apache.xerces.internal.impl.dv.util;

import java.util.AbstractList;

import com.sun.org.apache.xerces.internal.xs.XSException;
import com.sun.org.apache.xerces.internal.xs.datatypes.ByteList;

/**
 * Implementation of com.sun.org.apache.xerces.internal.xs.datatypes.ByteList.
 *
 * @xerces.internal 
 * 
 * @author Ankit Pasricha, IBM
 * 
 * @version $Id: ByteListImpl.java,v 1.7 2010-11-01 04:39:46 joehw Exp $
 */
public class ByteListImpl extends AbstractList implements ByteList {

    // actually data stored in a byte array
    protected final byte[] data;

    // canonical representation of the data
    protected String canonical;

    public ByteListImpl(byte[] data) {
        this.data = data;
    }

    /**
     * The number of bytes in the list. The range of
     * valid child object indices is 0 to length-1 inclusive.
     */
    public int getLength() {
        return data.length;
    }

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

    /**
     * Returns the indexth item in the collection. The index
     * starts at 0.
     * @param index  index into the collection.
     * @return  The byte at the indexth
     *   position in the ByteList.
     * @exception XSException
     *   INDEX_SIZE_ERR: if index is greater than or equal to the
     *   number of objects in the list.
     */
    public byte item(int index)
        throws XSException {

        if(index < 0 || index > data.length - 1) {
            throw new XSException(XSException.INDEX_SIZE_ERR, null);
        }
        return data[index];
    }

    /*
     * List methods
     */

    public Object get(int index) {
        if (index >= 0 && index < data.length) {
            return new Byte(data[index]);
        }
        throw new IndexOutOfBoundsException("Index: " + index);
    }

    public int size() {
        return getLength();
    }
}