//	---------------------------------------------------------------------------
//	jWebSocket - Copyright (c) 2010 jwebsocket.org
//	---------------------------------------------------------------------------
//	This program 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 3 of the License, or (at your
//	option) any later version.
//	This program 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 program; if not, see <http://www.gnu.org/licenses/lgpl.html>.
//	---------------------------------------------------------------------------
package org.jwebsocket.config.xml;

import org.jwebsocket.config.Config;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.util.List;
import javolution.util.FastList;
import org.jwebsocket.config.ConfigHandler;

/**
 * Handles the engine configuration
 *
 * @author puran
 * @version $Id: EngineConfigHandler.java 624 2010-07-06 12:28:44Z fivefeetfurther $
 */
public class EngineConfigHandler implements ConfigHandler {
    private static final String ELEMENT_ENGINE = "engine";
    private static final String ID = "id";
    private static final String NAME = "name";
    private static final String JAR = "jar";
    private static final String PORT = "port";
    private static final String TIMEOUT = "timeout";
    private static final String MAXFRAMESIZE = "maxframesize";
    private static final String DOMAINS = "domains";
    private static final String DOMAIN = "domain";

    /**
     * {@inheritDoc}
     */
    @Override
    public Config processConfig(XMLStreamReader streamReader)
            throws XMLStreamException {
        String id = "", name = "", jar = "";
        int port = 0, timeout = 0, framesize = 0;
        List<String> domains = null;
        while (streamReader.hasNext()) {
            streamReader.next();
            if (streamReader.isStartElement()) {
                String elementName = streamReader.getLocalName();
                if (elementName.equals(ID)) {
                    streamReader.next();
                    id = streamReader.getText();
                } else if (elementName.equals(NAME)) {
                    streamReader.next();
                    name = streamReader.getText();
                } else if (elementName.equals(JAR)) {
                    streamReader.next();
                    jar = streamReader.getText();
                } else if (elementName.equals(PORT)) {
                    streamReader.next();
                    port = Integer.parseInt(streamReader.getText());
                } else if (elementName.equals(TIMEOUT)) {
                    streamReader.next();
                    timeout = Integer.parseInt(streamReader.getText());
                } else if (elementName.equals(DOMAINS)) {
                    domains = getDomains(streamReader);
                } else if (elementName.equals(MAXFRAMESIZE)) {
                    streamReader.next();
                    framesize = Integer.parseInt(streamReader.getText());
                } else {
                    //ignore
                }
            }
            if (streamReader.isEndElement()) {
                String elementName = streamReader.getLocalName();
                if (elementName.equals(ELEMENT_ENGINE)) {
                    break;
                }
            }
        }
        return new EngineConfig(id, name, jar, port, timeout, framesize, domains);
    }

    /**
     * Read the list of domains
     *
     * @param streamReader the stream reader object
     * @return the list of domains for the engine
     * @throws XMLStreamException in case of stream exception
     */
    private List<String> getDomains(XMLStreamReader streamReader) throws XMLStreamException {
        List<String> domains = new FastList<String>();
        while (streamReader.hasNext()) {
            streamReader.next();
            if (streamReader.isStartElement()) {
                String elementName = streamReader.getLocalName();
                if (elementName.equals(DOMAIN)) {
                    streamReader.next();
                    domains.add(streamReader.getText());
                }
            }
            if (streamReader.isEndElement()) {
                String elementName = streamReader.getLocalName();
                if (elementName.equals(DOMAINS)) {
                    break;
                }
            }
        }
        return domains;
    }

}