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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 XSLoader. 
 * This interface should be implemented on the same object that implements 
 * DOMImplementation.
 *
 * @xerces.internal 
 *
 * @author Elena Litani, IBM
 * @version $Id: XSImplementationImpl.java,v 1.6 2010-11-01 04:39:55 joehw Exp $
 */
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