--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/CrossSectionArtifact.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,346 @@
+package org.dive4elements.river.artifacts;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.NavigableMap;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Document;
+
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.ArtifactFactory;
+import org.dive4elements.artifacts.CallMeta;
+
+import org.dive4elements.river.artifacts.access.RangeAccess;
+import org.dive4elements.river.artifacts.model.CrossSectionFacet;
+import org.dive4elements.river.artifacts.model.FastCrossSectionLineFactory;
+
+import org.dive4elements.river.model.FastCrossSectionLine;
+
+import org.dive4elements.river.model.CrossSection;
+import org.dive4elements.river.model.CrossSectionLine;
+import org.dive4elements.river.artifacts.model.CrossSectionFactory;
+
+import org.dive4elements.river.artifacts.states.StaticState;
+
+import org.dive4elements.artifactdatabase.state.Facet;
+import org.dive4elements.artifactdatabase.state.FacetActivity;
+import org.dive4elements.artifactdatabase.state.State;
+
+import org.dive4elements.river.artifacts.services.CrossSectionKMService;
+
+
+/**
+ * Artifact describing a cross-section.
+ */
+public class CrossSectionArtifact extends StaticFLYSArtifact {
+
+    /** Name of Artifact. */
+    public static final String CS_ARTIFACT_NAME = "cross_section";
+
+    /** Name of state. */
+    public static final String STATIC_STATE_NAME = "state.cross_section";
+
+    /** Name of data item keeping the position. */
+    public static final String DATA_KM = "cross_section.km";
+
+    /** Name of data item keeping the database id of this c.s.. */
+    public static final String DATA_DBID = "cross_section.dbid";
+
+    /** Name of data item flagging whether we think that we are master. */
+    public static final String DATA_IS_MASTER = "cross_section.master?";
+
+    /** Name of data item flagging whether we are the newest. */
+    public static final String DATA_IS_NEWEST = "cross_section.newest?";
+
+    /** Name of data item storing the previous possible km. */
+    public static final String DATA_PREV_KM = "cross_section.km.previous";
+
+    /** Name of data item storing the next possible km. */
+    public static final String DATA_NEXT_KM = "cross_section.km.next";
+
+    /** Own logger. */
+    private static final Logger logger =
+        Logger.getLogger(CrossSectionArtifact.class);
+
+    static {
+        // TODO: Move to configuration.
+        FacetActivity.Registry.getInstance().register(
+            CS_ARTIFACT_NAME,
+            new FacetActivity() {
+                @Override
+                public Boolean isInitialActive(
+                    Artifact artifact,
+                    Facet    facet,
+                    String   outputName
+                ) {
+                    if (artifact instanceof FLYSArtifact) {
+                        FLYSArtifact flys = (FLYSArtifact)artifact;
+                        String data = flys.getDataAsString(DATA_IS_NEWEST);
+                        return data != null && data.equals("1");
+                    }
+                    return null;
+                }
+            });
+    }
+
+    /** Return given name. */
+    @Override
+    public String getName() {
+        return CS_ARTIFACT_NAME;
+    }
+
+
+    /** Store ids, create a CrossSectionFacet. */
+    @Override
+    public void setup(
+        String          identifier,
+        ArtifactFactory factory,
+        Object          context,
+        CallMeta        callMeta,
+        Document        data)
+    {
+        logger.info("CrossSectionArtifact.setup");
+
+        super.setup(identifier, factory, context, callMeta, data);
+
+        String ids = getDatacageIDValue(data);
+
+        if (ids != null && ids.length() > 0) {
+            addStringData(DATA_DBID, ids);
+            logger.debug("CrossSectionArtifacts db-id: " + ids);
+        }
+        else {
+            throw new IllegalArgumentException("No attribute 'ids' found!");
+        }
+
+        List<Facet> fs = new ArrayList<Facet>();
+        CrossSection cs = CrossSectionFactory.getCrossSection(
+            Integer.parseInt(ids));
+
+        List<CrossSectionLine> csls = cs.getLines();
+        if (!csls.isEmpty()) {
+            CrossSectionLine csl = csls.get(0);
+            // Find min-km of cross sections,
+            // then set DATA_KM to min(DATA_KM, minCross).
+            double dataKm = Double.valueOf(getDataAsString(DATA_KM));
+            if (dataKm < csl.getKm().doubleValue()) {
+                addStringData(DATA_KM, csl.getKm().toString());
+            }
+        }
+        fs.add(new CrossSectionFacet(0, cs.getDescription()));
+
+        // Find out if we are newest and become master if so.
+        boolean isNewest = CrossSectionFactory.isNewest(cs);
+        String newString = (isNewest) ? "1" : "0";
+        addStringData(DATA_IS_NEWEST, newString);
+        addStringData(DATA_IS_MASTER, newString);
+
+        StaticState state = (StaticState) getCurrentState(context);
+
+        if (!fs.isEmpty()) {
+            addFacets(getCurrentStateId(), fs);
+        }
+    }
+
+
+    /** Copy km where master-artifact "starts". */
+    @Override
+    protected void initialize(
+        Artifact artifact,
+        Object   context,
+        CallMeta callMeta)
+    {
+        FLYSArtifact flys = (FLYSArtifact) artifact;
+
+        RangeAccess rangeAccess = new RangeAccess(flys, null);
+        double[] range = rangeAccess.getKmRange();
+        double min = 0.0f;
+        if (range != null && range.length > 0) {
+            min = range[0];
+        }
+        this.addStringData(DATA_KM, Double.toString(min));
+    }
+
+
+    /** Returns next possible km for a cross-section. */
+    public Double getNextKm() {
+        return getDataAsDouble(DATA_NEXT_KM);
+    }
+
+
+    /** Returns previous possible km for a cross-section. */
+    public Double getPrevKm() {
+        return getDataAsDouble(DATA_PREV_KM);
+    }
+
+
+    /**
+     * Create and return a new StaticState with charting output.
+     */
+    @Override
+    public State getCurrentState(Object cc) {
+        final List<Facet> fs = getFacets(getCurrentStateId());
+
+        StaticState state = new StaticState(STATIC_STATE_NAME) {
+            @Override
+            public Object staticCompute(List<Facet> facets) {
+                if (facets != null) {
+                    facets.addAll(fs);
+                }
+                return null;
+            }
+        };
+
+        state.addDefaultChartOutput("cross_section", fs);
+
+        return state;
+    }
+
+
+    /**
+     * Get a list containing the one and only State.
+     * @param  context ignored.
+     * @return list with one and only state.
+     */
+    @Override
+    protected List<State> getStates(Object context) {
+        ArrayList<State> states = new ArrayList<State>();
+        states.add(getCurrentState(context));
+
+        return states;
+    }
+
+    // TODO all data access needs proper caching.
+
+    /**
+     * Get a DataItem casted to int (0 if fails).
+     */
+    public int getDataAsIntNull(String dataName) {
+        String val = getDataAsString(dataName);
+        try {
+            return Integer.parseInt(val);
+        }
+        catch (NumberFormatException e) {
+            logger.warn("Could not get data " + dataName + " as int", e);
+            return 0;
+        }
+    }
+
+
+    /** Returns database-id of cross-section (from data). */
+    protected int getDBID() {
+        return getDataAsIntNull(DATA_DBID);
+    }
+
+
+    /**
+     * Return position (km) from data, 0 if not found.
+     */
+    protected double getKm() {
+        String val = getDataAsString(DATA_KM);
+        try {
+            return Double.valueOf(val);
+        }
+        catch (NumberFormatException e) {
+            logger.warn("Could not get data " + DATA_KM + " as double", e);
+            return 0;
+        }
+    }
+
+
+    /** Returns true if artifact is set to be a "master" (other facets will
+     * refer to this). */
+    public boolean isMaster() {
+        return !getDataAsString(DATA_IS_MASTER).equals("0");
+    }
+
+
+    /**
+     * Get points of Profile of cross section at given kilometer.
+     *
+     * @return an array holding coordinates of points of profile (
+     *         in the form {{x1, x2} {y1, y2}} ).
+     */
+    public double [][] getCrossSectionData() {
+        logger.info("getCrossSectionData() for cross_section.km "
+            + getDataAsString(DATA_KM));
+        FastCrossSectionLine line = searchCrossSectionLine();
+
+        return line != null
+               ? line.fetchCrossSectionProfile()
+               : null;
+    }
+
+
+    /**
+     * Get CrossSectionLine spatially closest to what is specified in the data
+     * "cross_section.km", null if considered too far.
+     *
+     * It also adds DataItems to store the next and previous (numerically)
+     * values at which cross-section data was recorded.
+     *
+     * @return CrossSectionLine closest to "cross_section.km", might be null
+     *         if considered too far.
+     */
+    public FastCrossSectionLine searchCrossSectionLine() {
+        double TOO_FAR = 1d;
+        CrossSection crossSection = CrossSectionFactory
+            .getCrossSection(getDBID());
+
+        if (logger.isDebugEnabled()) {
+            logger.debug("dbid " + getDBID() + " : " + crossSection);
+        }
+
+        NavigableMap<Double, Integer> kms = CrossSectionKMService
+            .getKms(crossSection.getId());
+
+        Double wishKM = getKm();
+
+        Double floor = kms.floorKey(wishKM);
+        Double ceil  = kms.ceilingKey(wishKM);
+
+        Double nextKm;
+        Double prevKm;
+
+        double floorD = floor != null
+            ? Math.abs(floor - wishKM)
+            : Double.MAX_VALUE;
+
+        double ceilD = ceil != null
+            ? Math.abs(ceil - wishKM)
+            : Double.MAX_VALUE;
+
+        double km;
+        if (floorD < ceilD) {
+            km = floor;
+        }
+        else {
+            km = ceil;
+        }
+
+        // If we are too far from the wished km, return null.
+        if (Math.abs(km - wishKM) > TOO_FAR) {
+            return null;
+        }
+
+        // Store next and previous km.
+        nextKm = kms.higherKey(km);
+        prevKm = kms.lowerKey(km);
+
+        if (prevKm == null) {
+            prevKm = -1d;
+        }
+        if (nextKm == null) {
+            nextKm = -1d;
+        }
+
+        addStringData(DATA_PREV_KM, prevKm.toString());
+        addStringData(DATA_NEXT_KM, nextKm.toString());
+
+        return FastCrossSectionLineFactory
+            .getCrossSectionLine(crossSection, km);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :