Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MapInfoService.java @ 4655:cd44d28d0fbc
Move the access to artifact data to the Access object
Use BedHeightAccess class to receive the data from the artifact. This abstracts
the data access from the actual artifact.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Tue, 11 Dec 2012 09:44:04 +0100 |
parents | 8e66293c5369 |
children | 6aa1b8abe2d3 |
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package de.intevation.flys.artifacts.services; import org.apache.log4j.Logger; import java.util.Map; import java.util.HashMap; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.Element; import javax.xml.xpath.XPathConstants; import com.vividsolutions.jts.geom.Envelope; import de.intevation.artifacts.CallMeta; import de.intevation.artifacts.GlobalContext; import de.intevation.artifacts.common.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.Config; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; import de.intevation.artifactdatabase.XMLService; import de.intevation.flys.utils.GeometryUtils; /** * This service provides information about the supported rivers by this * application. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class MapInfoService extends XMLService { /** XPath that points to the river.*/ public static final String XPATH_RIVER = "/mapinfo/river/text()"; public static final String XPATH_RIVER_PROJECTION = "/artifact-database/floodmap/river[@name=$river]/srid/@value"; public static final String XPATH_RIVER_BACKGROUND = "/artifact-database/floodmap/river[@name=$river]/background-wms"; public static final String XPATH_RIVER_WMS = "/artifact-database/floodmap/river[@name=$river]/river-wms/@url"; /** The logger used in this service.*/ private static Logger logger = Logger.getLogger(MapInfoService.class); /** * The default constructor. */ public MapInfoService() { } protected static String getStringXPath( String query, Map<String, String> variables ) { return (String)XMLUtils.xpath( Config.getConfig(), query, XPathConstants.STRING, null, variables); } protected static Node getNodeXPath( String query, Map<String, String> variables ) { return (Node)XMLUtils.xpath( Config.getConfig(), query, XPathConstants.NODE, null, variables); } @Override public Document processXML( Document data, GlobalContext globalContext, CallMeta callMeta ) { logger.debug("MapInfoService.process"); Document result = XMLUtils.newDocument(); ElementCreator cr = new ElementCreator(result, null, null); Element mapinfo = cr.create("mapinfo"); result.appendChild(mapinfo); String river = extractRiver(data); if (river == null || river.length() == 0) { logger.warn("Cannot generate information: river is empty!"); return result; } Element root = cr.create("river"); cr.addAttr(root, "name", river); mapinfo.appendChild(root); Envelope env = GeometryUtils.getRiverBoundary(river); if (env != null) { String bounds = GeometryUtils.jtsBoundsToOLBounds(env); logger.debug("River '" + river + "' bounds: " + bounds); Element bbox = cr.create("bbox"); cr.addAttr(bbox, "value", bounds); root.appendChild(bbox); } Map<String, String> vars = new HashMap<String, String>(); vars.put("river", river); String sridStr = getStringXPath(XPATH_RIVER_PROJECTION, vars); if (sridStr != null && sridStr.length() > 0) { Element srid = cr.create("srid"); cr.addAttr(srid, "value", sridStr); root.appendChild(srid); } Element back = (Element)getNodeXPath(XPATH_RIVER_BACKGROUND, vars); if (back != null) { Element background = cr.create("background-wms"); cr.addAttr(background, "url", back.getAttribute("url")); cr.addAttr(background, "layers", back.getAttribute("layers")); root.appendChild(background); } String wmsStr = getStringXPath(XPATH_RIVER_WMS, vars); if (wmsStr != null && wmsStr.length() > 0) { Element wms = cr.create("river-wms"); cr.addAttr(wms, "url", wmsStr); root.appendChild(wms); } return result; } protected String extractRiver(Document data) { return XMLUtils.xpathString( data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :