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/**
 * PETALS - PETALS Services Platform.
 * Copyright (c) 2007 EBM Websourcing, http://www.ebmwebsourcing.com/
 *
 * 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 Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * -------------------------------------------------------------------------
 * $Id$
 * -------------------------------------------------------------------------
 */

package org.ow2.petals.ws.topic;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.StringTokenizer;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMElement;
import org.ow2.petals.ws.fault.InvalidTopicExpressionFault;
import org.ow2.petals.ws.fault.WsnFault;

/**
 * @author chamerling - eBM WebSourcing
 * 
 */
public class WstHelper {

    private WstHelper() {
    }

    /**
     * Create a topic from an omElement
     * 
     * @param element
     *            the  element
     * @return
     */
    public static final Topic topicFromOM(OMElement element, TopicNamespace tns) throws WsnFault {
        if (element == null) {
            throw new NullPointerException("Topic element is null");
        }
        if (tns == null) {
            throw new NullPointerException("Topic NS is null");
        }

        // get the topic name
        String topicName = element.getAttributeValue(new QName("name"));
        if (topicName == null || topicName.length() == 0) {
            throw new InvalidTopicExpressionFault("No topic name");
        }

        Topic topic = new Topic(topicName, tns);

        // topic is final ?
        String finalValue = element.getAttributeValue(new QName(WstConstants.FINAL));
        if (finalValue != null && finalValue.length() > 0) {
            topic.setFinalTopic(Boolean.valueOf(finalValue).booleanValue());
        }

        // get the message types
        String messageTypesValue = element.getAttributeValue(new QName(WstConstants.MESSAGE_TYPES));
        Set messageTypeSet = new HashSet();
        if (messageTypesValue != null && messageTypesValue.length() > 0) {
            // the message types are separated by blanks like 'xyz:m1 tns:m2'
            StringTokenizer tokenizer = new StringTokenizer(messageTypesValue, " ");
            while (tokenizer.hasMoreTokens()) {
                String tmp = tokenizer.nextToken();
                // get a qname from the token
                // FIXME : do a QName resolution
                // QName qname = XmlUtils.parseQName(tmp, element);
                // messageTypeSet.add(qname);
            }
        }
        topic.setMessageTypes(messageTypeSet);

        // get the pattern
        OMElement patternElement = element.getFirstChildWithName(WstConstants.PATTERN_QNAME);
        if (patternElement != null) {
            topic.setMessagePattern(patternElement.getText());
        }

        Iterator iter = element.getChildrenWithName(WstConstants.TOPIC_QNAME);
        while (iter.hasNext()) {
            OMElement filterChildElement = (OMElement) iter.next();
            Topic childTopic = WstHelper.topicFromOM(filterChildElement, tns);
            topic.addTopic(topic);
        }
        return topic;
    }

    /**
     * Create a topic NS from an omElement
     * 
     * @param element
     * @return
     */
    public static final TopicNamespace topicNSFromOM(OMElement element) throws WsnFault {
        if (element == null) {
            throw new NullPointerException("Topic NS is null");
        }

        String targetNamespace = element.getAttributeValue(new QName("targetNamespace"));
        if (targetNamespace == null) {
            throw new InvalidTopicExpressionFault("No topic space NS");
        }

        TopicNamespace tns = new TopicNamespace(targetNamespace);
        tns.setName(element.getAttributeValue(new QName("name")));

        // get children (topics)
        Iterator iter = element.getChildrenWithName(WstConstants.TOPIC_QNAME);
        while (iter.hasNext()) {
            Topic topic = topicFromOM((OMElement) iter.next(), tns);
            tns.addTopic(topic);
        }
        return tns;
    }

    /**
     * Get the name of the root topic. The names are seperated by '/' and are
     * hierarchic; For example, for 'A/B/C', A is the root, B is its child. And
     * B is also the parent of C.
     * 
     * @param topicName
     * @return
     */
    public static final String getRootTopicName(QName topicName) {
        String name = topicName.getLocalPart();
        int slash = name.indexOf('/');
        int end = slash >= 0 ? slash : name.length();
        return name.substring(0, end);
    }

}