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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 *      http://www.apache.org/licenses/LICENSE-2.0
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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.

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./**
 * 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. /** Dom implementation singleton. */
    static final PSVIDOMImplementationImpl singleton = new PSVIDOMImplementationImpl();

    //
    // Public methods
    //

    
NON-DOM: Obtain and return the single shared object /** 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.
Params:
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.
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"
Returns:
   true iff this implementation is compatable with the specified
feature and version./**
     * 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