/*

 * 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.

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

import org.w3c.dom.DOMException;

import org.w3c.dom.DOMImplementation;

import org.w3c.dom.Document;

import org.w3c.dom.DocumentType;

/**

 * @xerces.internal

 *

 */

final class SchemaDOMImplementation implements DOMImplementation {

    private static final SchemaDOMImplementation singleton = new SchemaDOMImplementation();

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

    public static DOMImplementation getDOMImplementation() {

        return singleton;

    }

    private SchemaDOMImplementation() {}

    public Document createDocument(String namespaceURI, String qualifiedName, DocumentType doctype)

            throws DOMException {

        throw new DOMException(DOMException.NOT_SUPPORTED_ERR, "Method not supported");

    }

    public DocumentType createDocumentType(String qualifiedName, String publicId, String systemId)

            throws DOMException {

        throw new DOMException(DOMException.NOT_SUPPORTED_ERR, "Method not supported");

    }

    public Object getFeature(String feature, String version) {

        if (singleton.hasFeature(feature, version)) {

            return singleton;

        }

        return null;

    }

    public boolean hasFeature(String feature, String version) {

        final boolean anyVersion = version == null || version.length() == 0;

        return (feature.equalsIgnoreCase("Core") || feature.equalsIgnoreCase("XML")) &&

            (anyVersion || version.equals("1.0") || version.equals("2.0") || version.equals("3.0"));

    }

}