XmlStreamUtils.java

//$HeadURL$
/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2014 by:
 - Department of Geography, University of Bonn -
 and
 - lat/lon GmbH -

 This library is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free
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 any later version.
 This library is distributed in the hope that it will be useful, but WITHOUT
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 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 details.
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 along with this library; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 Contact information:

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 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/

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package org.deegree.securityproxy.xml;

import java.io.InputStream;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

/**
 * Contains some useful methods to process xml streams.
 * 
 * @author <a href="mailto:goltz@lat-lon.de">Lyn Goltz</a>
 * @author last edited by: $Author: lyn $
 * 
 * @version $Revision: $, $Date: $
 */
public final class XmlStreamUtils {

    private XmlStreamUtils() {
    }

    /**
     * Creates {@link javax.xml.stream.XMLStreamReader} of a {@link InputStream}. The start document is already skipped.
     * 
     * @param inputStream
     *            never <code>null</code>
     * @return reader the {@link XMLStreamReader} from the passed {@link InputStream}, never <code>null</code>
     * @throws XMLStreamException
     *             - input stream could not be parsed as xml
     */
    public static XMLStreamReader createReader( InputStream inputStream )
                    throws XMLStreamException {
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader reader = factory.createXMLStreamReader( inputStream );
        skipStartDocument( reader );
        return reader;
    }

    private static void skipStartDocument( XMLStreamReader parser )
                    throws XMLStreamException {
        while ( !parser.isStartElement() ) {
            parser.nextTag();
        }
    }

}