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annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/FixAnalysisYearXPathFunction.java @ 9234:2d4750874c57

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Cleanup and more fail safe
author gernotbelger
date Fri, 06 Jul 2018 13:12:04 +0200
parents 5030c46d8cb4
children abf4d0b10270
rev   line source
9232
5030c46d8cb4 Implemented xpath function that selectes the 'mean year' of a fixation-artifact.
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1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by
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3 * Björnsen Beratende Ingenieure GmbH
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4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
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5 *
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6 * This file is Free Software under the GNU AGPL (>=v3)
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7 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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8 * documentation coming with Dive4Elements River for details.
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9 */
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10 package org.dive4elements.river.artifacts.datacage.templating;
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11
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12 import java.util.List;
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13 import java.util.UUID;
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14
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15 import javax.xml.xpath.XPathFunction;
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16 import javax.xml.xpath.XPathFunctionException;
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17
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18 import org.dive4elements.artifacts.CallContext;
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19 import org.dive4elements.river.artifacts.D4EArtifact;
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20 import org.dive4elements.river.artifacts.FixationArtifact;
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21 import org.dive4elements.river.artifacts.access.FixRealizingAccess;
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22 import org.dive4elements.river.artifacts.model.fixings.FixRealizingCalculationExtended;
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23 import org.dive4elements.river.utils.RiverUtils;
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24
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25 /**
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26 * Very specialized function the resolves the 'year' (als middle of all used events) from a fix-analysis-vollmer
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27 * artifact).
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28 *
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29 * @author Gernot Belger
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30 */
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31 public class FixAnalysisYearXPathFunction implements XPathFunction {
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32
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33 public static final String ID = "fix_analysis_year";
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34
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35 public static final int ARITY = 1;
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36
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37 private final CallContext context;
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38
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39 public FixAnalysisYearXPathFunction(final CallContext context) {
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40 this.context = context;
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41 }
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42
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43 @Override
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44 public Object evaluate(final List args) throws XPathFunctionException {
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45
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46 final UUID uuid = (UUID) args.get(0);
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47 if (uuid == null)
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48 return null;
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49
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50 final D4EArtifact artifact = RiverUtils.getArtifact(uuid.toString(), this.context);
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51 if (!(artifact instanceof FixationArtifact))
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52 return null;
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53
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54 final FixationArtifact fixation = (FixationArtifact) artifact;
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55
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56 // Get W/Q input per gauge for this case.
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57 final FixRealizingAccess fixAccess = new FixRealizingAccess(fixation);
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58
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59 /* ugly but necessary to keep this logic at least a bit inside the FixRealizing stuff */
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60 final FixRealizingCalculationExtended calculation = new FixRealizingCalculationExtended(fixAccess);
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61 return calculation.determineMeanYear();
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62 }
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63 }
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