teichmann@5863: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5863:  * Software engineering by Intevation GmbH
teichmann@5863:  *
teichmann@5863:  * This file is Free Software under the GNU AGPL (>=v3) 
teichmann@5863:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5863:  * documentation coming with Dive4Elements River for details. 
teichmann@5863:  */
teichmann@5863: 
teichmann@5831: package org.dive4elements.river.artifacts.states;
ingo@942: 
ingo@1063: import java.util.HashMap;
ingo@942: import java.util.List;
ingo@1063: import java.util.Map;
ingo@1063: 
ingo@1063: import javax.xml.xpath.XPathConstants;
ingo@942: 
ingo@942: import org.apache.log4j.Logger;
ingo@1063: import org.w3c.dom.Document;
ingo@956: import org.w3c.dom.Node;
ingo@956: 
teichmann@5831: import org.dive4elements.artifactdatabase.state.Facet;
teichmann@5831: import org.dive4elements.artifacts.CallMeta;
teichmann@5831: import org.dive4elements.artifacts.common.utils.Config;
teichmann@5831: import org.dive4elements.artifacts.common.utils.XMLUtils;
teichmann@5831: import org.dive4elements.river.artifacts.FLYSArtifact;
teichmann@5831: import org.dive4elements.river.artifacts.model.map.WMSLayerFacet;
teichmann@5831: import org.dive4elements.river.artifacts.resources.Resources;
ingo@942: 
ingo@942: 
ingo@942: public class WMSBackgroundState extends OutputState {
ingo@942: 
ingo@954:     public static final String I18N_DESCRIPTION = "floodmap.wmsbackground";
ingo@954: 
ingo@1066:     public static final String XPATH_SRID =
ingo@1066:         "/artifact-database/floodmap/river[@name=$name]/srid/@value";
ingo@1066: 
ingo@956:     public static final String XPATH_WMS_URL =
ingo@1063:         "/artifact-database/floodmap/river[@name=$name]/background-wms/@url";
ingo@956: 
ingo@956:     public static final String XPATH_WMS_LAYER =
ingo@1063:         "/artifact-database/floodmap/river[@name=$name]/background-wms/@layers";
ingo@956: 
ingo@956: 
ingo@956:     protected String url;
ingo@956:     protected String layer;
ingo@1066:     protected String srid;
ingo@956: 
ingo@1926:     protected Document cfg;
ingo@1926: 
ingo@1926:     protected Map<String, String> variables;
ingo@1926: 
ingo@954: 
ingo@942:     private static final Logger logger = Logger.getLogger(WMSBackgroundState.class);
ingo@942: 
ingo@956: 
ingo@956:     @Override
ingo@956:     public void setup(Node config) {
ingo@956:         super.setup(config);
ingo@956: 
ingo@956:         logger.debug("WMSBackgroundState.setup()");
ingo@956:     }
ingo@956: 
ingo@956: 
ingo@942:     @Override
ingo@942:     public Object computeInit(
ingo@942:         FLYSArtifact artifact,
ingo@942:         String       hash,
ingo@958:         Object       context,
ingo@942:         CallMeta     meta,
ingo@942:         List<Facet>  facets
ingo@942:     ) {
ingo@942:         logger.debug("WMSBackgroundState.computeInit()");
ingo@942: 
ingo@1926:         initVariables(artifact);
ingo@1063: 
ingo@1926:         if (url == null || layer == null) {
ingo@1926:             // XXX I don't remember why 'srid', 'url' and 'layer' are member
ingo@1926:             // variables. I think the reason was buffering those values.
ingo@1926:             srid  = getSrid();
ingo@1926:             url   = getUrl();
ingo@1926:             layer = getLayer();
ingo@1063:         }
ingo@1063: 
ingo@1063:         if (url == null || layer == null) {
ingo@956:             logger.warn("No background layers currently configured:");
ingo@956:             logger.warn("... add config for WMS url: " + XPATH_WMS_URL);
ingo@956:             logger.warn("... add config for WMS layer: " + XPATH_WMS_LAYER);
ingo@956:             return null;
ingo@956:         }
ingo@956: 
ingo@942:         WMSLayerFacet facet = new WMSLayerFacet(
ingo@942:             0,
ingo@1926:             getFacetType(),
ingo@1926:             getTitle(meta),
ingo@942:             ComputeType.INIT,
ingo@942:             getID(), hash,
ingo@956:             url);
ingo@942: 
ingo@956:         facet.addLayer(layer);
ingo@1066:         facet.setSrid(srid);
ingo@942: 
ingo@942:         facets.add(facet);
ingo@942: 
ingo@942:         return null;
ingo@942:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected Document getConfig() {
ingo@1926:         if (cfg == null) {
ingo@1926:             cfg = Config.getConfig();
ingo@1926:         }
ingo@1926: 
ingo@1926:         return cfg;
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected void initVariables(FLYSArtifact artifact) {
ingo@1926:         String river = artifact.getDataAsString("river");
ingo@1926: 
ingo@1926:         variables = new HashMap<String, String>();
ingo@1926:         variables.put("name", river);
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected String getFacetType() {
ingo@1926:         return FLOODMAP_WMSBACKGROUND;
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected String getSrid() {
ingo@1926:         return (String) XMLUtils.xpath(
ingo@1926:             getConfig(),
ingo@1926:             XPATH_SRID,
ingo@1926:             XPathConstants.STRING,
ingo@1926:             null,
ingo@1926:             variables);
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected String getUrl() {
ingo@1926:         return (String) XMLUtils.xpath(
ingo@1926:             getConfig(),
ingo@1926:             XPATH_WMS_URL,
ingo@1926:             XPathConstants.STRING,
ingo@1926:             null,
ingo@1926:             variables);
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected String getLayer() {
ingo@1926:         return (String) XMLUtils.xpath(
ingo@1926:             getConfig(),
ingo@1926:             XPATH_WMS_LAYER,
ingo@1926:             XPathConstants.STRING,
ingo@1926:             null,
ingo@1926:             variables);
ingo@1926:     }
ingo@1926: 
ingo@1926: 
ingo@1926:     protected String getTitle(CallMeta meta) {
ingo@1926:         return Resources.getMsg(meta, I18N_DESCRIPTION, I18N_DESCRIPTION);
ingo@1926:     }
ingo@942: }
ingo@942: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :