ingo@1022: /*
ingo@1022:  * Copyright (c) 2010 by Intevation GmbH
ingo@1022:  *
ingo@1022:  * This program is free software under the LGPL (>=v2.1)
ingo@1022:  * Read the file LGPL.txt coming with the software for details
ingo@1022:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@1022:  */
ingo@1022: 
ingo@394: package de.intevation.gnv.action;
ingo@394: 
ingo@394: import javax.servlet.http.HttpServletRequest;
ingo@394: import javax.servlet.http.HttpServletResponse;
ingo@394: 
ingo@394: import org.apache.log4j.Logger;
ingo@394: import org.apache.struts.action.ActionForm;
ingo@394: import org.apache.struts.action.ActionForward;
ingo@394: import org.apache.struts.action.ActionMapping;
ingo@394: 
tim@963: import de.intevation.gnv.action.sessionmodel.SessionModel;
tim@963: import de.intevation.gnv.action.sessionmodel.SessionModelFactory;
tim@963: import de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient;
tim@963: import de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClientFactory;
tim@963: import de.intevation.gnv.artifactdatabase.objects.ArtifactDescription;
tim@963: import de.intevation.gnv.artifactdatabase.objects.ArtifactObject;
tim@963: 
ingo@394: /**
ingo@690:  * This controller is used to step back to a previous state of the current
ingo@690:  * artifact. After calling the advance operation of the artifact server have
ingo@690:  * been called successfully, the describe document of the current artifact is
ingo@690:  * fetched and a new gui is rendered.
sascha@699:  *
sascha@684:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@394:  */
ingo@409: public class PreviousArtifactStepAction extends DescribeUIAction {
ingo@394: 
ingo@394: 
ingo@394:     public static final String URL_STATE_KEY = "target";
ingo@394: 
tim@963:     /**
tim@963:      * the logger, used to log exceptions and additonaly information
tim@963:      */
ingo@394:     private static Logger logger =
ingo@394:         Logger.getLogger(PreviousArtifactStepAction.class);
ingo@394: 
ingo@394: 
tim@963:     /**
tim@963:      * Constructor
tim@963:      */
ingo@394:     public PreviousArtifactStepAction() {
ingo@394:         super();
ingo@394:     }
ingo@394: 
ingo@394: 
ingo@394:     @Override
ingo@394:     public ActionForward execute(
ingo@394:         ActionMapping       mapping,
ingo@394:         ActionForm          form,
ingo@394:         HttpServletRequest  request,
ingo@394:         HttpServletResponse response
ingo@394:     ) throws Exception {
ingo@394: 
ingo@409:         SessionModel session = SessionModelFactory.getInstance().getSessionModel(
ingo@409:             request);
ingo@394: 
ingo@580:         ArtifactDescription ad = session.getArtifactDescription();
ingo@580:         if (ad == null) {
ingo@580:             logger.warn("Session timed out.");
ingo@580:             request.setAttribute(
ingo@991:                 CommunicationKeys.REQUEST_EXCEPTION_SESSION_ID,
ingo@580:                 "SessionTimeout has occured");
ingo@991:             return new FetchArtifactFactoriesAction().execute(
ingo@580:                 mapping, form, request, response);
ingo@580:         }
ingo@580: 
ingo@409:         // TODO check if target is reachable
ingo@394: 
ingo@409:         ArtifactDatabaseClientFactory f =
ingo@409:             ArtifactDatabaseClientFactory.getInstance();
ingo@409:         ArtifactDatabaseClient client   =
ingo@409:             f.getArtifactDatabaseClient(getLocale(request));
ingo@394: 
ingo@409:         ArtifactObject artifactFactory = session.getSelectedArtifactFactory();
ingo@409:         ArtifactObject currentArtifact = session.getCurrentArtifact();
ingo@394: 
ingo@409:         String target = (String) request.getParameter(URL_STATE_KEY);
ingo@409:         logger.debug("Step back to previous state: " + target);
ingo@409: 
ingo@580:         try {
ingo@580:             client.doAdvance(
ingo@580:                 artifactFactory,
ingo@580:                 currentArtifact,
ingo@580:                 target
ingo@580:             );
ingo@580:         }
ingo@580:         catch (Exception e) {
ingo@580:             logger.error(e, e);
ingo@580:             request.setAttribute(
ingo@580:                 CommunicationKeys.REQUEST_EXCEPTION_MESSAGE_ID,
ingo@580:                 e.getMessage());
ingo@580:         }
ingo@394: 
ingo@394:         return super.execute(mapping, form, request, response);
ingo@394:     }
ingo@394: }
ingo@409: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :