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

import java.util.AbstractList;

import com.sun.org.apache.xerces.internal.xs.ShortList;
import com.sun.org.apache.xerces.internal.xs.XSException;

/**
 * Containts a list of Object's.
 *
 * @xerces.internal 
 *
 * @author Sandy Gao, IBM
 *
 * @version $Id: ShortListImpl.java,v 1.7 2010-11-01 04:40:06 joehw Exp $
 */
public final class ShortListImpl extends AbstractList implements ShortList {

    /**
     * An immutable empty list.
     */
    public static final ShortListImpl EMPTY_LIST = new ShortListImpl(new short[0], 0);

    // The array to hold all data
    private final short[] fArray;
    // Number of elements in this list
    private final int fLength;

    /**
     * Construct an XSObjectList implementation
     *
     * @param array     the data array
     * @param length    the number of elements
     */
    public ShortListImpl(short[] array, int length) {
        fArray = array;
        fLength = length;
    }

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

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

    public short item(int index) throws XSException {
        if (index < 0 || index >= fLength) {
            throw new XSException(XSException.INDEX_SIZE_ERR, null);
        }
        return fArray[index];
    }

    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof ShortList)) {
            return false;
        }
        ShortList rhs = (ShortList)obj;

        if (fLength != rhs.getLength()) {
            return false;
        }
        for (int i = 0;i < fLength; ++i) {
            if (fArray[i] != rhs.item(i)) {
                return false;
            }
        }
        return true;
    }

    /*
     * List methods
     */

    public Object get(int index) {
        if (index >= 0 && index < fLength) {
            return new Short(fArray[index]);
        }
        throw new IndexOutOfBoundsException("Index: " + index);
    }

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

} // class ShortListImpl