Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/DistanceInfoService.java @ 1077:3067e700fc13
Minor cosmetics and docs.
flys-artifacts/trunk@2574 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 25 Aug 2011 10:34:20 +0000 |
parents | b1ed0ec0236f |
children | 26e19cdaed5e |
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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.GlobalContext; 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 { private static enum DistanceFilter { NONE, LOCATIONS, DISTANCES } /** 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()"; public static final String FILTER_XPATH = "/art:river/art:filter/text()"; /** * The default constructor. */ public DistanceInfoService() { } @Override public Document process( Document data, GlobalContext globalContext, CallMeta callMeta ) { logger.debug("DistanceInfoService.process"); String river = XMLUtils.xpathString( data, RIVER_XPATH, ArtifactNamespaceContext.INSTANCE); String filter = XMLUtils.xpathString( data, FILTER_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, filter); } String key = getCacheKey(river, filter); net.sf.ehcache.Element element = cache.get(key); if (element != null) { logger.debug("distance info found in cache"); return (Document)element.getValue(); } Document result = getUncached(river, filter); element = new net.sf.ehcache.Element(key, result); logger.debug("store distance info found into cache"); cache.put(element); return result; } protected String getCacheKey(String river, String filtertype) { return filtertype != null && filtertype.length() > 0 ? river + "_" + filtertype : river; } protected Document getUncached(String river, String filtertype) { Document result = XMLUtils.newDocument(); Session session = SessionHolder.acquire(); try { Iterator<Annotation> iter = AnnotationsFactory.getAnnotationsIterator(river); Element all = result.createElement("distances"); DistanceFilter filter = getDistanceFilter(filtertype); while (iter.hasNext()) { Annotation a = iter.next(); Element distance = buildDistanceNode(result, a, filter); if (distance != null) { all.appendChild(distance); } } result.appendChild(all); } finally { session.close(); SessionHolder.release(); } return result; } protected static DistanceFilter getDistanceFilter(String type) { if (type.equals("locations")) { logger.debug("Found 'location' filter."); return DistanceFilter.LOCATIONS; } else if (type.equals("distances")) { logger.debug("Found 'distances' filter."); return DistanceFilter.DISTANCES; } logger.debug("Do not use any filter at all."); return DistanceFilter.NONE; } /** * Builds an Element for a distance info. * * @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, DistanceFilter filter ) { Position pos = anno.getPosition(); Range range = anno.getRange(); Attribute attr = anno.getAttribute(); Edge edge = anno.getEdge(); BigDecimal a = range.getA(); BigDecimal b = range.getB(); if (b == null && filter == DistanceFilter.DISTANCES) { return null; } if (b != null && filter == DistanceFilter.LOCATIONS) { return null; } 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 :