Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/RiverInfoServiceImpl.java @ 4710:0ad7141c7dcc
Documentation.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 19 Dec 2012 11:41:51 +0100 |
parents | 9fca4d60fb7c |
children |
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package de.intevation.flys.client.server; import java.text.DateFormat; import java.text.ParseException; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Locale; import javax.xml.xpath.XPathConstants; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import de.intevation.artifacts.common.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.httpclient.exceptions.ConnectionException; import de.intevation.artifacts.httpclient.http.HttpClient; import de.intevation.artifacts.httpclient.http.HttpClientImpl; import de.intevation.flys.client.client.services.RiverInfoService; import de.intevation.flys.client.shared.exceptions.ServerException; import de.intevation.flys.client.shared.model.DefaultGaugeInfo; import de.intevation.flys.client.shared.model.DefaultMeasurementStation; import de.intevation.flys.client.shared.model.DefaultRiverInfo; import de.intevation.flys.client.shared.model.GaugeInfo; import de.intevation.flys.client.shared.model.MeasurementStation; import de.intevation.flys.client.shared.model.RiverInfo; /** * GWT Service to serve the gauge and measurement station info * * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a> */ public class RiverInfoServiceImpl extends RemoteServiceServlet implements RiverInfoService { private static final Logger logger = Logger.getLogger(RiverInfoServiceImpl.class); public static final String ERROR_NO_RIVER_INFO_FOUND = "error_no_riverinfo_found"; private static final String XPATH_RIVER = "/art:river-info/art:river"; private static final String XPATH_STATIONS = "/art:river-info/art:measurement-stations/art:measurement-station"; private static final String XPATH_GAUGES = "/art:river-info/art:gauges/art:gauge"; public static final DateFormat DATE_FORMAT = DateFormat.getDateInstance( DateFormat.SHORT, Locale.GERMANY); public RiverInfo getGauges(String river) throws ServerException { logger.info("RiverInfoServiceImpl.getRiverInfo"); String url = getServletContext().getInitParameter("server-url"); Document doc = XMLUtils.newDocument(); XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element riverele = ec.create("river"); riverele.setTextContent(river); doc.appendChild(riverele); HttpClient client = new HttpClientImpl(url); try { Document result = client.callService(url, "gaugeoverviewinfo", doc); DefaultRiverInfo riverinfo = getRiverInfo(result); List<GaugeInfo>gauges = createGauges(result, riverinfo.getName(), riverinfo.isKmUp(), riverinfo.getWstUnit()); riverinfo.setGauges(gauges); logger.debug("Finished RiverInfoService.getGauges."); return riverinfo; } catch (ConnectionException ce) { logger.error(ce, ce); } logger.warn("No gauge found"); throw new ServerException(ERROR_NO_RIVER_INFO_FOUND); } public RiverInfo getMeasurementStations(String river) throws ServerException { logger.info("RiverInfoServiceImpl.getMeasurementStations"); String url = getServletContext().getInitParameter("server-url"); Document doc = XMLUtils.newDocument(); XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element riverele = ec.create("river"); riverele.setTextContent(river); doc.appendChild(riverele); HttpClient client = new HttpClientImpl(url); try { Document result = client.callService(url, "measurementstationinfo", doc); DefaultRiverInfo riverinfo = getRiverInfo(result); List<MeasurementStation> mstations = createMeasurementStations( result, riverinfo.getName(), riverinfo.isKmUp()); riverinfo.setMeasurementStations(mstations); logger.debug("Finished MeasurementStationInfoService."); return riverinfo; } catch (ConnectionException ce) { logger.error(ce, ce); } logger.warn("No measurement station found"); throw new ServerException(ERROR_NO_RIVER_INFO_FOUND); } /** * Avoids NullPointerException when parsing double value */ private Double parseDouble(String value) { if (value == null || value.isEmpty()) { return null; } try { return Double.valueOf(value); } catch(NumberFormatException e) { logger.error(e, e); return null; } } private Long parseLong(String value) { if (value == null || value.isEmpty()) { return null; } try { return Long.valueOf(value); } catch(NumberFormatException e) { logger.error(e, e); return null; } } private Integer parseInteger(String value) { if (value == null || value.isEmpty()) { return null; } try { return Integer.valueOf(value); } catch(NumberFormatException e) { logger.error(e, e); return null; } } private Date parseDate(String value) { if (value == null || value.isEmpty()) { return null; } try { return DATE_FORMAT.parse(value); } catch(ParseException e) { logger.error(e, e); return null; } } private List<MeasurementStation> createMeasurementStations( Document result, String rivername, boolean kmup) { NodeList stationnodes = (NodeList) XMLUtils.xpath( result, XPATH_STATIONS, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); int num = stationnodes == null ? 0 : stationnodes.getLength(); ArrayList<MeasurementStation> mstations = new ArrayList<MeasurementStation>(num); if (num == 0) { logger.warn("No measurement station found."); } else { logger.debug("Found " + num + " measurement stations."); for (int i = 0; i < num; i++) { Element stationele = (Element)stationnodes.item(i); String mname = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "name"); String mstart = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "start"); String mend = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "end"); String mstation = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "station"); String mtype = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "type"); String riverside = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "riverside"); String mid = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "id"); String moperator = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "operator"); String mstarttime = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "starttime"); String mstoptime = stationele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "stoptime"); String gaugename = null; Element gaugeele = (Element)stationele.getFirstChild(); if (gaugeele != null) { gaugename = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "name"); } logger.debug("Found measurement station with name " + mname); MeasurementStation station = new DefaultMeasurementStation( rivername, mname, parseInteger(mid), parseDouble(mstation), parseDouble(mstart), parseDouble(mend), kmup, riverside, mtype, moperator, parseDate(mstarttime), parseDate(mstoptime), gaugename ); mstations.add(station); } } return mstations; } private List<GaugeInfo> createGauges( Document result, String rivername, Boolean kmup, String rwstunit) { NodeList gaugenodes = (NodeList) XMLUtils.xpath( result, XPATH_GAUGES, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); int num = gaugenodes == null ? 0 : gaugenodes.getLength(); ArrayList<GaugeInfo> gauges = new ArrayList<GaugeInfo>(num); if (num == 0) { logger.warn("No gauge info found."); } else { logger.debug("Found " + num + " gauges."); for (int i = 0; i < num; i++) { Element gaugeele = (Element)gaugenodes.item(i); String gname = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "name"); String gstart = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "start"); String gend = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "end"); String gdatum = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "datum"); String gaeo = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "aeo"); String gminq = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "minq"); String gminw = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "minw"); String gmaxq = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "maxq"); String gmaxw = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "maxw"); String gstation = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "station"); String gofficial = gaugeele.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "official"); logger.debug("Found gauge with name " + gname); GaugeInfo gaugeinfo = new DefaultGaugeInfo( rivername, gname, kmup, parseDouble(gstation), parseDouble(gstart), parseDouble(gend), parseDouble(gdatum), parseDouble(gaeo), parseDouble(gminq), parseDouble(gmaxq), parseDouble(gminw), parseDouble(gmaxw), rwstunit, parseLong(gofficial) ); gauges.add(gaugeinfo); } } return gauges; } private DefaultRiverInfo getRiverInfo(Document result) { Element riverresp = (Element) XMLUtils.xpath( result, XPATH_RIVER, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); String rname = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "name"); String rkmup = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "kmup"); String rstart = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "start"); String rend = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "end"); String rwstunit = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "wstunit"); String rminq = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "minq"); String rmaxq = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "maxq"); String rofficial = riverresp.getAttributeNS( ArtifactNamespaceContext.NAMESPACE_URI, "official"); logger.debug("River is " + rname); boolean kmup = rkmup.equalsIgnoreCase("true"); DefaultRiverInfo riverinfo = new DefaultRiverInfo( rname, kmup, parseDouble(rstart), parseDouble(rend), rwstunit, parseDouble(rminq), parseDouble(rmaxq), parseLong(rofficial) ); return riverinfo; } }