/*

 * 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 com.sun.org.apache.xerces.internal.impl.xs.XSImplementationImpl;

import java.util.ArrayList;

import java.util.List;

import org.w3c.dom.DOMImplementation;

import org.w3c.dom.DOMImplementationList;

/**

 * Allows to retrieve <code>XSImplementation</code>, DOM Level 3 Core and LS implementations

 * and PSVI implementation.

 * <p>See also the

 * <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#DOMImplementationSource'>

 * Document Object Model (DOM) Level 3 Core Specification</a>.

 *

 * @xerces.internal

 *

 * @author Elena Litani, IBM

 * @LastModified: Oct 2017

 */

public class DOMXSImplementationSourceImpl

    extends DOMImplementationSourceImpl {

    /**

     * A method to request a DOM implementation.

     * @param features A string that specifies which features are required.

     *   This is a space separated list in which each feature is specified

     *   by its name optionally followed by a space and a version number.

     *   This is something like: "XML 1.0 Traversal Events 2.0"

     * @return An implementation that has the desired features, or

     *   <code>null</code> if this source has none.

     */

    public DOMImplementation getDOMImplementation(String features) {

        DOMImplementation impl = super.getDOMImplementation(features);

        if (impl != null){

            return impl;

        }

        // if not try the PSVIDOMImplementation

        impl = PSVIDOMImplementationImpl.getDOMImplementation();

        if (testImpl(impl, features)) {

            return impl;

        }

        // if not try the XSImplementation

        impl = XSImplementationImpl.getDOMImplementation();

        if (testImpl(impl, features)) {

            return impl;

        }

        return null;

    }

    /**

     * A method to request a list of DOM implementations that support the

     * specified features and versions, as specified in .

     * @param features A string that specifies which features and versions

     *   are required. This is a space separated list in which each feature

     *   is specified by its name optionally followed by a space and a

     *   version number. This is something like: "XML 3.0 Traversal +Events

     *   2.0"

     * @return A list of DOM implementations that support the desired

     *   features.

     */

    public DOMImplementationList getDOMImplementationList(String features) {

        final List<DOMImplementation> implementations = new ArrayList<>();

        // first check whether the CoreDOMImplementation would do

        DOMImplementationList list = super.getDOMImplementationList(features);

        //Add core DOMImplementations

        for (int i=0; i < list.getLength(); i++ ) {

            implementations.add(list.item(i));

        }

        DOMImplementation impl = PSVIDOMImplementationImpl.getDOMImplementation();

        if (testImpl(impl, features)) {

            implementations.add(impl);

        }

        impl = XSImplementationImpl.getDOMImplementation();

        if (testImpl(impl, features)) {

            implementations.add(impl);

        }

        return new DOMImplementationListImpl(implementations);

    }

}