/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * 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 org.w3c.dom.DOMImplementation;

import org.w3c.dom.DocumentType;

/**

 * The DOMImplementation class is description of a particular

 * implementation of the Document Object Model. As such its data is

 * static, shared by all instances of this implementation.

 * <P>

 * The DOM API requires that it be a real object rather than static

 * methods. However, there's nothing that says it can't be a singleton,

 * so that's how I've implemented it.

 *

 * @xerces.internal

 *

 * @since  PR-DOM-Level-1-19980818.

 */

public class PSVIDOMImplementationImpl extends DOMImplementationImpl {

    //

    // Data

    //

    // static

    /** Dom implementation singleton. */

    static final PSVIDOMImplementationImpl singleton = new PSVIDOMImplementationImpl();

    //

    // Public methods

    //

    /** NON-DOM: Obtain and return the single shared object */

    public static DOMImplementation getDOMImplementation() {

        return singleton;

    }

    //

    // DOMImplementation methods

    //

    /**

     * Test if the DOM implementation supports a specific "feature" --

     * currently meaning language and level thereof.

     *

     * @param feature      The package name of the feature to test.

     * In Level 1, supported values are "HTML" and "XML" (case-insensitive).

     * At this writing, com.sun.org.apache.xerces.internal.dom supports only XML.

     *

     * @param version      The version number of the feature being tested.

     * This is interpreted as "Version of the DOM API supported for the

     * specified Feature", and in Level 1 should be "1.0"

     *

     * @return    true iff this implementation is compatable with the specified

     * feature and version.

     */

    public boolean hasFeature(String feature, String version) {

        return super.hasFeature(feature, version) ||

               feature.equalsIgnoreCase("psvi");

    } // hasFeature(String,String):boolean

    //

    // Protected methods

    //

    protected CoreDocumentImpl createDocument(DocumentType doctype) {

        return new PSVIDocumentImpl(doctype);

    }

} // class PSVIDOMImplementationImpl