Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 692:22e4bffbe240 facets-slt
Generated facets for each output aspect.
flys-artifacts/branches/facets-slt@2132 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 16 Jun 2011 10:05:44 +0000 |
parents | 3dc61e00385e |
children | eab5e5089d77 |
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package de.intevation.flys.artifacts.services; import java.math.BigDecimal; import java.util.Iterator; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import de.intevation.artifacts.CallMeta; import de.intevation.artifacts.common.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifactdatabase.DefaultService; import de.intevation.flys.backend.SessionHolder; import de.intevation.flys.model.Annotation; import de.intevation.flys.model.Attribute; import de.intevation.flys.model.Position; import de.intevation.flys.model.Range; import de.intevation.flys.model.Edge; import de.intevation.flys.artifacts.model.AnnotationsFactory; import org.hibernate.Session; import de.intevation.flys.artifacts.cache.CacheFactory; import net.sf.ehcache.Cache; /** * This service provides information about distances of a specified river. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class DistanceInfoService extends DefaultService { /** The logger used in this service.*/ private static Logger logger = Logger.getLogger(DistanceInfoService.class); public static final String CACHE_NAME = "service-distanceinfo"; public static final String RIVER_XPATH = "/art:river/text()"; /** * The default constructor. */ public DistanceInfoService() { } public Document process( Document data, Object globalContext, CallMeta callMeta) { logger.debug("DistanceInfoService.process"); String river = XMLUtils.xpathString( data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE); if (river == null || (river = river.trim()).length() == 0) { logger.warn("No river specified. Cannot return distance info!"); return XMLUtils.newDocument(); } logger.debug("Search distances for river: " + river); Cache cache = CacheFactory.getCache(CACHE_NAME); if (cache == null) { logger.debug("no cache configured for distance info"); return getUncached(river); } net.sf.ehcache.Element element = cache.get(river); if (element != null) { logger.debug("distance info found in cache"); return (Document)element.getValue(); } Document result = getUncached(river); element = new net.sf.ehcache.Element(river, result); logger.debug("store distance info found into cache"); cache.put(element); return result; } protected Document getUncached(String river) { Document result = XMLUtils.newDocument(); Session session = SessionHolder.acquire(); try { Iterator<Annotation> iter = AnnotationsFactory.getAnnotationsIterator(river); Element all = result.createElement("distances"); while (iter.hasNext()) { Annotation a = iter.next(); Element distance = buildDistanceNode(result, a); all.appendChild(distance); } result.appendChild(all); } finally { session.close(); SessionHolder.release(); } return result; } /** * This method build an Element for a distance info. * * @param ec The ElementCreator. * @param anno The Annotation that provides information about the distance. * * @return an Element that contains information about a distance. */ protected static Element buildDistanceNode( Document document, Annotation anno ) { Position pos = anno.getPosition(); Range range = anno.getRange(); Attribute attr = anno.getAttribute(); Edge edge = anno.getEdge(); BigDecimal a = range.getA(); BigDecimal b = range.getB(); Element distance = document.createElement("distance"); distance.setAttribute("description", pos.getValue()); String riverSide = attr.getValue(); if (riverSide != null && riverSide.length() > 0) { distance.setAttribute("riverside", riverSide); } if (a != null) { distance.setAttribute("from", a.toString()); } if (b != null) { distance.setAttribute("to", b.toString()); } if (edge != null) { BigDecimal bottom = edge.getBottom(); BigDecimal top = edge.getTop(); if (bottom != null) { distance.setAttribute("bottom", bottom.toString()); } if (top != null) { distance.setAttribute("top", top.toString()); } } return distance; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :