WSPolicyParser.java

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 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
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package org.picketlink.identity.federation.core.parsers.wsp;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

import org.picketlink.identity.federation.core.ErrorCodes;
import org.picketlink.identity.federation.core.exceptions.ParsingException;
import org.picketlink.identity.federation.core.parsers.AbstractParser;
import org.picketlink.identity.federation.core.parsers.ParserController;
import org.picketlink.identity.federation.core.parsers.ParserNamespaceSupport;
import org.picketlink.identity.federation.core.parsers.util.StaxParserUtil;
import org.picketlink.identity.federation.core.wspolicy.WSPolicyConstants;
import org.picketlink.identity.federation.core.wstrust.WSTrustConstants;
import org.picketlink.identity.federation.ws.policy.AppliesTo;

/**
 * <p>
 * Parses the WS-Policy elements that can be part of the WS-T RST
 * </p>
 *
 * @author Anil.Saldhana@redhat.com
 * @since Oct 14, 2010
 */
public class WSPolicyParser extends AbstractParser {
    /**
     * @see {@link ParserNamespaceSupport#parse(XMLEventReader)}
     */
    public Object parse(XMLEventReader xmlEventReader) throws ParsingException {
        while (xmlEventReader.hasNext()) {
            XMLEvent xmlEvent = StaxParserUtil.peek(xmlEventReader);

            if (xmlEvent instanceof StartElement) {
                StartElement startElement = (StartElement) xmlEvent;

                String elementName = StaxParserUtil.getStartElementName(startElement);
                if (elementName.equalsIgnoreCase(WSPolicyConstants.APPLIES_TO)) {
                    // Get the AppliesTo element
                    startElement = StaxParserUtil.getNextStartElement(xmlEventReader);

                    AppliesTo appliesTo = new AppliesTo();

                    // Now we do not do anything to the applies to element. We go further
                    startElement = StaxParserUtil.peekNextStartElement(xmlEventReader);

                    QName qname = startElement.getName();
                    ParserNamespaceSupport parser = ParserController.get(qname);
                    if (parser == null)
                        throw new RuntimeException(ErrorCodes.UNKNOWN_TAG + qname);

                    Object parsedObject = parser.parse(xmlEventReader);
                    appliesTo.addAny(parsedObject);

                    EndElement endElement = StaxParserUtil.getNextEndElement(xmlEventReader);
                    StaxParserUtil.validate(endElement, WSPolicyConstants.APPLIES_TO);
                    return appliesTo;
                }
            } else {
                StaxParserUtil.getNextEvent(xmlEventReader);
            }
        }
        throw logger.parserFailed(WSTrustConstants.WSP_NS);
    }

    /**
     * @see {@link ParserNamespaceSupport#supports(QName)}
     */
    public boolean supports(QName qname) {
        String nsURI = qname.getNamespaceURI();

        return WSTrustConstants.WSP_NS.equals(nsURI) || WSTrustConstants.WSP_15_NS.equals(nsURI);
    }
}