diff flys-client/src/main/java/de/intevation/flys/client/server/MapInfoServiceImpl.java @ 828:910b03de6857

Added a service to get some basic spatial information used for map creation. flys-client/trunk@2529 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 23 Aug 2011 09:43:12 +0000
parents
children ab8eb2f544f2
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/server/MapInfoServiceImpl.java	Tue Aug 23 09:43:12 2011 +0000
@@ -0,0 +1,124 @@
+package de.intevation.flys.client.server;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import com.google.gwt.user.server.rpc.RemoteServiceServlet;
+
+import de.intevation.artifacts.common.utils.XMLUtils;
+import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
+
+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.exceptions.ServerException;
+import de.intevation.flys.client.shared.model.BBox;
+import de.intevation.flys.client.shared.model.MapInfo;
+
+import de.intevation.flys.client.client.services.MapInfoService;
+
+
+/**
+ * This service fetches a document that contains meta information for a specific
+ * chart.
+ *
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class MapInfoServiceImpl
+extends      RemoteServiceServlet
+implements   MapInfoService
+{
+    public static final String XPATH_RIVER =
+        "/mapinfo/river/@name";
+
+    public static final String XPATH_SRID =
+        "/mapinfo/river/srid/@value";
+
+    public static final String XPATH_BBOX  =
+        "/mapinfo/river/bbox/@value";
+
+    public static final String XPATH_RIVER_WMS =
+        "/mapinfo/river/river-wms/@url";
+
+    public static final String XPATH_WMS_URL =
+        "/mapinfo/river/background-wms/@url";
+
+    public static final String XPATH_WMS_LAYERS =
+        "/mapinfo/river/background-wms/@layers";
+
+    public static final String ERROR_NO_MAPINFO_FOUND =
+        "mapinfo_service_no_result";
+
+
+    public MapInfo getMapInfo(String url, String locale, String river)
+    throws ServerException
+    {
+        System.out.println("MapInfoServiceImpl.getMapInfo");
+
+        Document request = getRequestDocument(river);;
+
+        HttpClient client = new HttpClientImpl(url, locale);
+
+        try {
+            System.out.println("MapInfoServiceImpl.callService");
+            Document result = client.callService(url, "mapinfo", request);
+
+            if (result == null) {
+                System.err.println("MapInfo service returned no result.");
+                throw new ServerException(ERROR_NO_MAPINFO_FOUND);
+            }
+
+            return getMapInfo(result);
+        }
+        catch (ConnectionException ce) {
+            System.err.println(ce.getLocalizedMessage());
+        }
+
+        throw new ServerException(ERROR_NO_MAPINFO_FOUND);
+    }
+
+
+    public static Document getRequestDocument(String rivername) {
+        System.out.println("MapInfoServiceImpl.getRequestDocument");
+
+        Document  request = XMLUtils.newDocument();
+        ElementCreator cr = new ElementCreator(request, null, null);
+
+        Element root  = cr.create("mapinfo");
+        Element river = cr.create("river");
+
+        river.setTextContent(rivername);
+
+        request.appendChild(root);
+        root.appendChild(river);
+
+        return request;
+    }
+
+
+    public static MapInfo getMapInfo(Document result) {
+        System.out.println("MapInfoServiceImpl.getMapInfo");
+
+        String river   = XMLUtils.xpathString(result, XPATH_RIVER, null);
+        String sridStr = XMLUtils.xpathString(result, XPATH_SRID, null);
+        String bboxS   = XMLUtils.xpathString(result, XPATH_BBOX,  null);
+        BBox   bbox    = BBox.getBBoxFromString(bboxS);
+
+        String riverWMS  = XMLUtils.xpathString(result, XPATH_RIVER_WMS, null);
+        String wmsURL    = XMLUtils.xpathString(result, XPATH_WMS_URL, null);
+        String wmsLayers = XMLUtils.xpathString(result, XPATH_WMS_LAYERS, null);
+
+        int srid = 4326;
+
+        try {
+            srid = Integer.parseInt(sridStr);
+        }
+        catch (NumberFormatException nfe) {
+            // do nothing
+        }
+
+        return new MapInfo(river, srid, bbox, riverWMS, wmsURL, wmsLayers);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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