package de.intevation.artifactdatabase;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

import de.intevation.artifacts.ServiceFactory;
import de.intevation.artifacts.Service;

import org.apache.log4j.Logger;

/**
 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
 */
public class DefaultServiceFactory
implements   ServiceFactory
{
    private static Logger logger =
        Logger.getLogger(DefaultServiceFactory.class);

    public static final String XPATH_NAME        = "@name";
    public static final String XPATH_DESCRIPTION = "@description";
    public static final String XPATH_SERVICE     = "@service";

    public static final String DEFAULT_DESCRIPTION =
        "No description available";

    public static final String DEFAULT_SERVICE =
        "de.intevation.artifactdatabase.DefaultService";

    protected String name;

    protected String description;

    protected Class  serviceClass;

    public DefaultServiceFactory() {
    }

    public String getName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

    public Service createService(Object globalContext) {
        try {
            Service service = (Service)serviceClass.newInstance();

            service.setup(this, globalContext);

            return service;
        }
        catch (InstantiationException ie) {
            logger.error(ie.getLocalizedMessage(), ie);
        }
        catch (IllegalAccessException iae) {
            logger.error(iae.getLocalizedMessage(), iae);
        }
        catch (ClassCastException cce) {
            logger.error(cce.getLocalizedMessage(), cce);
        }

        return null;
    }

    public void setup(Document config, Node factoryNode) {

        description = Config.getStringXPath(
            factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);

        name = Config.getStringXPath(
            factoryNode, XPATH_NAME, toString());

        String service = Config.getStringXPath(
            factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);

        try {
            serviceClass = Class.forName(service);
        }
        catch (ClassNotFoundException cnfe) {
            logger.error(cnfe.getLocalizedMessage(), cnfe);
        }

        if (serviceClass == null) {
            serviceClass = DefaultService.class;
        }
    }
}
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