/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * 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

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

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

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

 *

 */

    /**

     * 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 <code>Objects</code> in the list. The range of valid

     * child node indices is 0 to <code>length-1</code> inclusive.

     */

    public int getLength() {

        return fLength;

    }

    /**

     *  Checks if the <code>unsigned short</code> <code>item</code> is a

     * member of this list.

     * @param item  <code>unsigned short</code> whose presence in this list

     *   is to be tested.

     * @return  True if this list contains the <code>unsigned short</code>

     *   <code>item</code>.

     */

    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

     */

        if (index >= 0 && index < fLength) {

            return fArray[index];

        }

        throw new IndexOutOfBoundsException("Index: " + index);

    }

    public int size() {

        return getLength();

    }

} // class ShortListImpl