/*

 * 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.LSInputList;

import java.lang.reflect.Array;

import java.util.AbstractList;

import org.w3c.dom.ls.LSInput;

/**

 * Contains a list of LSInputs.

 *

 * @xerces.internal

 *

 * @author Michael Glavassevich, IBM

 *

 * @LastModified: Oct 2017

 */

@SuppressWarnings("unchecked") // method <T>toArray(T[])

public final class LSInputListImpl extends AbstractList<LSInput> implements LSInputList {

    /**

     * An immutable empty list.

     */

    public static final LSInputListImpl EMPTY_LIST = new LSInputListImpl(new LSInput[0], 0);

    // The array to hold all data

    private final LSInput[] fArray;

    // Number of elements in this list

    private final int fLength;

    /**

     * Construct an LSInputList implementation

     *

     * @param array     the data array

     * @param length    the number of elements

     */

    public LSInputListImpl(LSInput[] array, int length) {

        fArray = array;

        fLength = length;

    }

    /**

     * The number of <code>LSInput</code>s in the list. The range of valid

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

     */

    public int getLength() {

        return fLength;

    }

    /**

     * Returns the <code>index</code>th item in the collection or

     * <code>null</code> if <code>index</code> is greater than or equal to

     * the number of objects in the list. The index starts at 0.

     * @param index  index into the collection.

     * @return  The <code>LSInput</code> at the <code>index</code>th

     *   position in the <code>LSInputList</code>, or <code>null</code> if

     *   the index specified is not valid.

     */

    public LSInput item(int index) {

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

            return null;

        }

        return fArray[index];

    }

    /*

     * List methods

     */

    public LSInput get(int index) {

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

            return fArray[index];

        }

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

    }

    public int size() {

        return getLength();

    }

    public Object[] toArray() {

        Object[] a = new Object[fLength];

        toArray0(a);

        return a;

    }

    public Object[] toArray(Object[] a) {

        if (a.length < fLength) {

            Class<?> arrayClass = a.getClass();

            Class<?> componentType = arrayClass.getComponentType();

            a = (Object[]) Array.newInstance(componentType, fLength);

        }

        toArray0(a);

        if (a.length > fLength) {

            a[fLength] = null;

        }

        return a;

    }

    private void toArray0(Object[] a) {

        if (fLength > 0) {

            System.arraycopy(fArray, 0, a, 0, fLength);

        }

    }

} // LSInputListImpl