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import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.AttributesImpl;

 * Sniffs the root element name and its attributes from SAX events.
 * @author Kohsuke Kawaguchi
public final class RootElementSniffer extends DefaultHandler {
    private String nsUri = "##error";
    private String localName = "##error";
    private Attributes atts;

    private final boolean parseAttributes;

    public RootElementSniffer(boolean parseAttributes) {
        this.parseAttributes = parseAttributes;

    public RootElementSniffer() {

    public void startElement(String uri, String localName, String qName, Attributes a) throws SAXException {
        this.nsUri = uri;
        this.localName = localName;
        if(parseAttributes) {
            if(a.getLength()==0)    // often there's no attribute
                this.atts = EMPTY_ATTRIBUTES;
                this.atts = new AttributesImpl(a);

        // no need to parse any further.
        throw aSAXException;

    public String getNsUri() {
        return nsUri;

    public String getLocalName() {
        return localName;

    public Attributes getAttributes() {
        return atts;

    private static final SAXException aSAXException = new SAXException();
    private static final Attributes EMPTY_ATTRIBUTES = new AttributesImpl();
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