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 * 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;

import com.sun.org.apache.xerces.internal.dom.CoreDOMImplementationImpl;

import com.sun.org.apache.xerces.internal.dom.DOMMessageFormatter;

import com.sun.org.apache.xerces.internal.impl.xs.util.StringListImpl;

import com.sun.org.apache.xerces.internal.xs.StringList;

import com.sun.org.apache.xerces.internal.xs.XSException;

import com.sun.org.apache.xerces.internal.xs.XSImplementation;

import com.sun.org.apache.xerces.internal.xs.XSLoader;

import org.w3c.dom.DOMImplementation;

/**

 * Implements XSImplementation interface that allows one to retrieve an instance of <code>XSLoader</code>.

 * This interface should be implemented on the same object that implements

 * DOMImplementation.

 *

 * @xerces.internal

 *

 * @author Elena Litani, IBM

 */

public class XSImplementationImpl extends CoreDOMImplementationImpl

                                                                  implements XSImplementation {

    //

    // Data

    //

    // static

    /** Dom implementation singleton. */

    static XSImplementationImpl singleton = new XSImplementationImpl();

    //

    // 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 (feature.equalsIgnoreCase("XS-Loader") && (version == null || version.equals("1.0")) ||

                super.hasFeature(feature, version));

    } // hasFeature(String,String):boolean

    /* (non-Javadoc)

     * @see com.sun.org.apache.xerces.internal.xs.XSImplementation#createXSLoader(com.sun.org.apache.xerces.internal.xs.StringList)

     */

    public XSLoader createXSLoader(StringList versions) throws XSException {

        XSLoader loader = new XSLoaderImpl();

        if (versions == null){

                        return loader;

        }

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

                if (!versions.item(i).equals("1.0")){

                                String msg =

                                        DOMMessageFormatter.formatMessage(

                                                DOMMessageFormatter.DOM_DOMAIN,

                                                "FEATURE_NOT_SUPPORTED",

                                                new Object[] { versions.item(i) });

                                throw new XSException(XSException.NOT_SUPPORTED_ERR, msg);

                }

        }

        return loader;

    }

    /* (non-Javadoc)

     * @see com.sun.org.apache.xerces.internal.xs.XSImplementation#getRecognizedVersions()

     */

    public StringList getRecognizedVersions() {

        StringListImpl list = new StringListImpl(new String[]{"1.0"}, 1);

        return list;

    }

} // class XSImplementationImpl