--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WaterlevelFacet.java	Fri Sep 28 12:14:43 2012 +0200
@@ -0,0 +1,125 @@
+package de.intevation.flys.artifacts.model;
+
+import de.intevation.artifactdatabase.state.Facet;
+
+import de.intevation.artifacts.Artifact;
+import de.intevation.artifacts.CallContext;
+
+import de.intevation.flys.artifacts.FLYSArtifact;
+
+import de.intevation.flys.artifacts.states.DefaultState.ComputeType;
+import de.intevation.flys.artifacts.math.Linear;
+
+import org.apache.log4j.Logger;
+
+/**
+ * Facet of a Waterlevel (WQKms).
+ */
+public class WaterlevelFacet extends DataFacet {
+
+    private static Logger logger = Logger.getLogger(WaterlevelFacet.class);
+
+    public WaterlevelFacet(int index, String name, String description) {
+        super(index, name, description, ComputeType.ADVANCE, null, null);
+    }
+
+    public WaterlevelFacet(
+        int         index,
+        String      name,
+        String      description,
+        ComputeType type,
+        String      stateID,
+        String      hash
+    ) {
+        super(index, name, description, type, hash, stateID);
+    }
+
+    public WaterlevelFacet() {
+    }
+
+    protected WQKms [] getWQKms(CalculationResult res) {
+        return (WQKms [])res.getData();
+    }
+
+    /**
+     * Get waterlevel data.
+     * @return a WQKms at given index.
+     */
+    public Object getData(Artifact artifact, CallContext context) {
+
+        if (logger.isDebugEnabled()) {
+            logger.debug("Get data for waterlevels at index: " + index +
+                " /stateId: " + stateId);
+        }
+
+        FLYSArtifact winfo = (FLYSArtifact) artifact;
+
+        CalculationResult res = (CalculationResult)
+            winfo.compute(context, hash, stateId, type, false);
+
+        if (res == null) {
+            logger.error("WaterlevelFacet.getData: null result");
+            return null;
+        }
+
+        if (winfo == null) {
+            logger.error("WaterlevelFacet.getData: artifact is null");
+            return null;
+        }
+
+        WQKms [] wqkms = getWQKms(res);
+        Object KM = context.getContextValue("currentKm");
+        if (KM != null) {
+            logger.debug("interpolate at given km");
+            // TODO handle exact match.
+
+            WQKms wqkmsI = wqkms[index];
+            double km = (Double)KM;
+
+            // TODO employ DataUtils interface to TDoubleArraList
+            int size = wqkmsI.size();
+            boolean kmIncreasing = wqkmsI.getKm(0) < wqkmsI.getKm(size-1);
+            int mod = kmIncreasing ? +1 : -1;
+            int idx = 0;
+            if (!kmIncreasing) {
+                while (idx < size && wqkmsI.getKm(idx) < km) {
+                    idx++;
+                }
+            }
+            else {
+                idx = size-1;
+                while (idx > 0 && wqkmsI.getKm(idx) > km) {
+                    idx--;
+                }
+            }
+            WQKms resultWQKms = new WQKms();
+            if (idx != -1 && idx < size) {
+                double inW = Linear.linear(
+                    km,
+                    wqkmsI.getKm(idx), wqkmsI.getKm(idx-mod),
+                    wqkmsI.getW(idx), wqkmsI.getW(idx-mod));
+                double inQ = Linear.linear(
+                    km,
+                    wqkmsI.getKm(idx), wqkmsI.getKm(idx-mod),
+                    wqkmsI.getQ(idx), wqkmsI.getQ(idx-mod));
+                resultWQKms.add(inW, inQ, km);
+            }
+            return resultWQKms;
+        }
+
+        return wqkms != null ? wqkms[index] : null;
+    }
+
+
+    /** Copy deeply. */
+    @Override
+    public Facet deepCopy() {
+        WaterlevelFacet copy = new WaterlevelFacet();
+        copy.set(this);
+        copy.type    = type;
+        copy.hash    = hash;
+        copy.stateId = stateId;
+        return copy;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :