teichmann@5861: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5861:  * Software engineering by Intevation GmbH
teichmann@5861:  *
teichmann@5861:  * This file is Free Software under the GNU AGPL (>=v3) 
teichmann@5861:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5861:  * documentation coming with Dive4Elements River for details. 
teichmann@5861:  */
teichmann@5861: 
teichmann@5835: package org.dive4elements.river.client.server;
ingo@221: 
ingo@221: import org.w3c.dom.Document;
ingo@221: 
ingo@1367: import org.apache.log4j.Logger;
ingo@1367: 
ingo@221: import com.google.gwt.user.server.rpc.RemoteServiceServlet;
ingo@221: 
teichmann@5835: import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
teichmann@5835: import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
teichmann@5835: import org.dive4elements.artifacts.common.utils.XMLUtils;
ingo@221: 
teichmann@5835: import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
teichmann@5835: import org.dive4elements.artifacts.httpclient.http.HttpClient;
teichmann@5835: import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
teichmann@5835: import org.dive4elements.artifacts.httpclient.http.response.DocumentResponseHandler;
ingo@221: 
teichmann@5835: import org.dive4elements.river.client.shared.exceptions.ServerException;
teichmann@5835: import org.dive4elements.river.client.shared.model.Artifact;
teichmann@5835: import org.dive4elements.river.client.client.services.GetArtifactService;
ingo@221: 
ingo@221: 
ingo@221: /**
ingo@221:  * This service provides a method that returns an artifact based on its
ingo@221:  * identifier.
ingo@221:  *
ingo@221:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@221:  */
ingo@221: public class GetArtifactServiceImpl
ingo@221: extends      RemoteServiceServlet
ingo@221: implements   GetArtifactService
ingo@221: {
ingo@1367:     private static final Logger logger =
ingo@1367:         Logger.getLogger(GetArtifactServiceImpl.class);
ingo@1367: 
ingo@1367: 
ingo@221:     public static final String ERROR_DESCRIBE_ARTIFACT =
ingo@221:         "error_describe_artifact";
ingo@221: 
ingo@221:     public static final String XPATH_RESULT = "/art:result/text()";
ingo@221: 
ingo@221:     public static final String OPERATION_FAILURE = "FAILED";
ingo@221: 
ingo@221: 
ingo@229:     public Artifact getArtifact(
ingo@229:         String locale,
ingo@229:         String uuid,
ingo@229:         String hash)
ingo@221:     throws ServerException
ingo@221:     {
ingo@1367:         logger.info("GetArtifactServiceImpl.getArtifact");
ingo@229: 
raimund@1425:         String url  = getServletContext().getInitParameter("server-url");
raimund@1425: 
ingo@221:         Document describe = ClientProtocolUtils.newDescribeDocument(
ingo@221:             uuid, hash, true);
ingo@221: 
ingo@229:         HttpClient client = new HttpClientImpl(url, locale);
ingo@221: 
ingo@221:         try {
ingo@221:             Document description = (Document) client.describe(
teichmann@5835:                 new org.dive4elements.artifacts.httpclient.objects.Artifact(
ingo@221:                     uuid, hash),
ingo@221:                 describe,
ingo@221:                 new DocumentResponseHandler());
ingo@221: 
ingo@221:             if (description == null) {
ingo@221:                 throw new ServerException(ERROR_DESCRIBE_ARTIFACT);
ingo@221:             }
ingo@221: 
ingo@221:             String result = XMLUtils.xpathString(
ingo@221:                 description,
ingo@221:                 XPATH_RESULT,
ingo@221:                 ArtifactNamespaceContext.INSTANCE);
ingo@221: 
ingo@221:             if (result == null || !result.equals(OPERATION_FAILURE)) {
ingo@221:                 return (Artifact) new FLYSArtifactCreator().create(description);
ingo@221:             }
ingo@221:         }
ingo@221:         catch (ConnectionException ce) {
ingo@1367:             logger.error(ce, ce);
ingo@221:         }
ingo@221: 
ingo@221:         throw new ServerException(ERROR_DESCRIBE_ARTIFACT);
ingo@221:     }
ingo@221: }
ingo@221: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :