--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/org/dive4elements/river/client/server/MetaDataServiceImpl.java	Thu Apr 25 12:31:32 2013 +0200
@@ -0,0 +1,113 @@
+package de.intevation.flys.client.server;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.apache.log4j.Logger;
+
+import com.google.gwt.user.server.rpc.RemoteServiceServlet;
+
+import de.intevation.artifacts.common.ArtifactNamespaceContext;
+
+import de.intevation.artifacts.common.utils.XMLUtils;
+
+import de.intevation.flys.client.shared.exceptions.ServerException;
+
+import de.intevation.flys.client.client.services.MetaDataService;
+
+import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
+
+import de.intevation.artifacts.httpclient.http.HttpClient;
+import de.intevation.artifacts.httpclient.http.HttpClientImpl;
+
+import de.intevation.flys.client.shared.model.DataCageTree;
+
+import de.intevation.flys.client.server.meta.Converter;
+
+/**
+ * Service that returns certain meta-data from the backends data, polished to
+ * inclusion into current project.
+ */
+public class MetaDataServiceImpl
+extends      RemoteServiceServlet
+implements   MetaDataService
+{
+    /** Our very own logger. */
+    private static final Logger logger =
+        Logger.getLogger(MetaDataServiceImpl.class);
+
+    public static final String ERROR_NO_META_DATA_FOUND =
+        "error_no_meta_data_found";
+
+
+    /**
+     * @param locale needed for i18n.
+     * @param artifactId ID of masterartifact (can be null)
+     * @param userId can be null
+     * @param outs can be null
+     * @param parameters can be null or parameters like "load-system:true;key:value"
+     */
+    @Override
+    public DataCageTree getMetaData(
+        String locale,
+        String artifactId,
+        String userId,
+        String outs,
+        String parameters
+    ) throws ServerException
+    {
+        logger.info("MetaDataService.getMetaData");
+
+        // Create the query document.
+        String url = getServletContext().getInitParameter("server-url");
+
+        Document doc = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element meta = ec.create("meta");
+
+        if (artifactId != null) {
+            Element artifactEl = ec.create("artifact-id");
+            artifactEl.setAttribute("value", artifactId);
+            meta.appendChild(artifactEl);
+        }
+
+        if (userId != null) {
+            Element userEl = ec.create("user-id");
+            userEl.setAttribute("value", userId);
+            meta.appendChild(userEl);
+        }
+
+        if (outs != null) {
+            Element outsEl = ec.create("outs");
+            outsEl.setAttribute("value", outs);
+            meta.appendChild(outsEl);
+        }
+
+        if (parameters != null) {
+            Element paramsEl = ec.create("parameters");
+            paramsEl.setAttribute("value", parameters);
+            meta.appendChild(paramsEl);
+        }
+
+        doc.appendChild(meta);
+
+        // Fire.
+        HttpClient client = new HttpClientImpl(url, locale);
+
+        try {
+            Converter converter = new Converter();
+            return converter.convert(client.callService(url, "metadata", doc));
+        }
+        catch (ConnectionException ce) {
+            ce.printStackTrace();
+        }
+
+        throw new ServerException(ERROR_NO_META_DATA_FOUND);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :