/*

 * 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.dom;

import java.util.ArrayList;

import java.util.List;

import org.w3c.dom.DOMImplementation;

import org.w3c.dom.DOMImplementationList;

/**

 * <p>This class implements the DOM Level 3 Core interface DOMImplementationList.</p>

 *

 * @xerces.internal

 *

 * @author Neil Delima, IBM

 * @since DOM Level 3 Core

 * @LastModified: Oct 2017

 */

public class DOMImplementationListImpl implements DOMImplementationList {

    //A collection of DOMImplementations

    private List<DOMImplementation> fImplementations;

    /**

     * Construct an empty list of DOMImplementations

     */

    public DOMImplementationListImpl() {

        fImplementations = new ArrayList<>();

    }

    /**

     * Construct an empty list of DOMImplementations

     */

    public DOMImplementationListImpl(List<DOMImplementation> params) {

        fImplementations = params;

    }

    /**

     * Returns the indexth item in the collection.

     *

     * @param index The index of the DOMImplemetation from the list to return.

     */

    public DOMImplementation item(int index) {

        try {

            return fImplementations.get(index);

        } catch (IndexOutOfBoundsException e) {

            return null;

        }

    }

    /**

     * Returns the number of DOMImplementations in the list.

     *

     * @return An integer indicating the number of DOMImplementations.

     */

    public int getLength() {

        return fImplementations.size();

    }

}