--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/WMSBackgroundState.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,156 @@
+package org.dive4elements.river.artifacts.states;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.xpath.XPathConstants;
+
+import org.apache.log4j.Logger;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+
+import org.dive4elements.artifactdatabase.state.Facet;
+import org.dive4elements.artifacts.CallMeta;
+import org.dive4elements.artifacts.common.utils.Config;
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+import org.dive4elements.river.artifacts.FLYSArtifact;
+import org.dive4elements.river.artifacts.model.map.WMSLayerFacet;
+import org.dive4elements.river.artifacts.resources.Resources;
+
+
+public class WMSBackgroundState extends OutputState {
+
+    public static final String I18N_DESCRIPTION = "floodmap.wmsbackground";
+
+    public static final String XPATH_SRID =
+        "/artifact-database/floodmap/river[@name=$name]/srid/@value";
+
+    public static final String XPATH_WMS_URL =
+        "/artifact-database/floodmap/river[@name=$name]/background-wms/@url";
+
+    public static final String XPATH_WMS_LAYER =
+        "/artifact-database/floodmap/river[@name=$name]/background-wms/@layers";
+
+
+    protected String url;
+    protected String layer;
+    protected String srid;
+
+    protected Document cfg;
+
+    protected Map<String, String> variables;
+
+
+    private static final Logger logger = Logger.getLogger(WMSBackgroundState.class);
+
+
+    @Override
+    public void setup(Node config) {
+        super.setup(config);
+
+        logger.debug("WMSBackgroundState.setup()");
+    }
+
+
+    @Override
+    public Object computeInit(
+        FLYSArtifact artifact,
+        String       hash,
+        Object       context,
+        CallMeta     meta,
+        List<Facet>  facets
+    ) {
+        logger.debug("WMSBackgroundState.computeInit()");
+
+        initVariables(artifact);
+
+        if (url == null || layer == null) {
+            // XXX I don't remember why 'srid', 'url' and 'layer' are member
+            // variables. I think the reason was buffering those values.
+            srid  = getSrid();
+            url   = getUrl();
+            layer = getLayer();
+        }
+
+        if (url == null || layer == null) {
+            logger.warn("No background layers currently configured:");
+            logger.warn("... add config for WMS url: " + XPATH_WMS_URL);
+            logger.warn("... add config for WMS layer: " + XPATH_WMS_LAYER);
+            return null;
+        }
+
+        WMSLayerFacet facet = new WMSLayerFacet(
+            0,
+            getFacetType(),
+            getTitle(meta),
+            ComputeType.INIT,
+            getID(), hash,
+            url);
+
+        facet.addLayer(layer);
+        facet.setSrid(srid);
+
+        facets.add(facet);
+
+        return null;
+    }
+
+
+    protected Document getConfig() {
+        if (cfg == null) {
+            cfg = Config.getConfig();
+        }
+
+        return cfg;
+    }
+
+
+    protected void initVariables(FLYSArtifact artifact) {
+        String river = artifact.getDataAsString("river");
+
+        variables = new HashMap<String, String>();
+        variables.put("name", river);
+    }
+
+
+    protected String getFacetType() {
+        return FLOODMAP_WMSBACKGROUND;
+    }
+
+
+    protected String getSrid() {
+        return (String) XMLUtils.xpath(
+            getConfig(),
+            XPATH_SRID,
+            XPathConstants.STRING,
+            null,
+            variables);
+    }
+
+
+    protected String getUrl() {
+        return (String) XMLUtils.xpath(
+            getConfig(),
+            XPATH_WMS_URL,
+            XPathConstants.STRING,
+            null,
+            variables);
+    }
+
+
+    protected String getLayer() {
+        return (String) XMLUtils.xpath(
+            getConfig(),
+            XPATH_WMS_LAYER,
+            XPathConstants.STRING,
+            null,
+            variables);
+    }
+
+
+    protected String getTitle(CallMeta meta) {
+        return Resources.getMsg(meta, I18N_DESCRIPTION, I18N_DESCRIPTION);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :