christian@6457: package org.dive4elements.river.artifacts.services;
christian@6457: 
christian@6457: import javax.xml.xpath.XPathConstants;
christian@6457: 
christian@6457: import org.apache.log4j.Logger;
christian@6457: import org.dive4elements.artifacts.CallMeta;
christian@6457: import org.dive4elements.artifacts.GlobalContext;
christian@6457: import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
christian@6457: import org.dive4elements.artifacts.common.utils.Config;
christian@6457: import org.dive4elements.artifacts.common.utils.XMLUtils;
christian@6457: import org.w3c.dom.Document;
christian@6457: import org.w3c.dom.Element;
christian@6457: 
christian@6457: /**
christian@6457:  * Through this service the client can retrieve basic information about or
christian@6457:  * configuration of the artifact server.
christian@6457:  * Currently it only returns the help-url (wiki) to the client.
christian@6457:  *
christian@6457:  * @author <a href="mailto:christian.lins@intevation.de">Christian Lins</a>
christian@6457:  */
christian@6457: public class ServerInfoService extends D4EService {
christian@6457: 
christian@6457:     /** The logger used in this service.*/
christian@6457:     private static Logger logger = Logger.getLogger(ServerInfoService.class);
christian@6457: 
christian@6457:     private static final String XPATH_HELP_URL = "/artifact-database/help-url/text()";
christian@6457: 
christian@6457:     @Override
christian@6457:     protected Document doProcess(Document data, GlobalContext globalContext,
christian@6457:             CallMeta callMeta) {
christian@6457:         logger.debug("ServerInfoService.process");
christian@6457: 
christian@6457:         Document result = XMLUtils.newDocument();
christian@6457: 
christian@6457:         XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
christian@6457:             result,
christian@6457:             ArtifactNamespaceContext.NAMESPACE_URI,
christian@6457:             ArtifactNamespaceContext.NAMESPACE_PREFIX);
christian@6457: 
christian@6457:         Element serverInfo = ec.create("server");
christian@6457: 
christian@6457:         String helpUrl = (String) XMLUtils.xpath(
christian@6457:                 Config.getConfig(),
christian@6457:                 XPATH_HELP_URL,
christian@6457:                 XPathConstants.STRING);
christian@6457: 
christian@6457:         Element info = ec.create("info");
christian@6457:         ec.addAttr(info, "key", "help-url", true);
christian@6457:         ec.addAttr(info, "value", helpUrl, true);
christian@6457: 
christian@6457:         result.appendChild(serverInfo);
christian@6457: 
christian@6457:         return result;
christian@6457:     }
christian@6457: 
christian@6457: }