--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/AreaFacet.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,145 @@
+package org.dive4elements.river.artifacts.model;
+
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.CallContext;
+
+import org.dive4elements.artifactdatabase.state.DefaultFacet;
+import org.dive4elements.artifactdatabase.state.Facet;
+
+import org.dive4elements.artifacts.DataProvider;
+
+import org.dive4elements.river.artifacts.AreaArtifact;
+
+
+/**
+ * Trival Facet for areas.
+ * Note that this Facet comes in two "types" (names):
+ *  <ul>
+ *    <li>CROSS_SECTION_AREA (cross_section.area) and</li>
+ *    <li>LONGITUDINAL_SECTION_AREA (longitudinal.area</li>
+ *  </ul>
+ * This is to support different diagram types without being painted in both
+ * at the same time. The name has to be given when constructing.
+ */
+public class AreaFacet
+extends      DefaultFacet
+{
+    private static Logger logger = Logger.getLogger(AreaFacet.class);
+
+    /**
+     * Constructor, set (maybe localized) description and name.
+     * @param idx Index given when querying artifact for data.
+     * @param name important to discern areas in different diagram types.
+     */
+    public AreaFacet(int idx, String name, String description) {
+        super(idx, name, description);
+    }
+
+
+    /**
+     * Gets Cross Section (profile).
+     * @param art artifact to get data from.
+     * @param context ignored
+     */
+    public Object getData(Artifact art, CallContext context) {
+        logger.debug("Get data for area.");
+
+        // Get information from artifact about which
+        // info to grab from blackboard.
+        //
+        // All compatible facets should provide their data
+        // under the key (Artifact-UUID + Facet-Index).
+        AreaArtifact artifact = (AreaArtifact) art;
+        Object lowerData      = null;
+        Object upperData      = null;
+        String stemFacetName  = null;
+
+        List<DataProvider> providers = context.
+            getDataProvider(artifact.getLowerDPKey());
+        if (providers.size() < 1) {
+            logger.warn("No 'lower' provider given for area [" +
+                artifact.getLowerDPKey() + "]");
+        }
+        else {
+            lowerData = providers.get(0).provideData(
+                artifact.getLowerDPKey(), null, context);
+            logger.debug("'Lower' data provider key for area [" +
+                artifact.getLowerDPKey() + "]");
+            stemFacetName = artifact.getLowerDPKey().split(":")[1];
+        }
+
+        providers = context.getDataProvider(artifact.getUpperDPKey());
+        if (providers.size() < 1) {
+            logger.warn("No 'upper' provider given for area [" +
+                artifact.getUpperDPKey() + "]");
+        }
+        else {
+            upperData = providers.get(0).provideData(
+                artifact.getUpperDPKey(), null, context);
+            logger.debug("'Upper' data provider key for area [" +
+                artifact.getUpperDPKey() + "]");
+            if (stemFacetName == null) {
+                stemFacetName = artifact.getUpperDPKey().split(":")[1];
+            }
+        }
+
+        if (upperData == null && lowerData == null) {
+            logger.warn("Not given 'upper' and 'lower' for area");
+        }
+
+        return new Data(stemFacetName, lowerData, upperData,
+            Boolean.valueOf(artifact.getPaintBetween()));
+    }
+
+
+    /** Do a deep copy. */
+    @Override
+    public Facet deepCopy() {
+        AreaFacet copy = new AreaFacet(this.index, this.name, this.description);
+        copy.set(this);
+        return copy;
+    }
+
+    /** Result data bundle. */
+    public class Data {
+        protected String  rootFacetName;
+        protected Object  upperData;
+        protected Object  lowerData;
+        protected boolean doPaintBetween;
+
+        /** Create a new result data bundle. */
+        public Data(String rootName, Object low, Object up, boolean between) {
+            this.rootFacetName  = rootName;
+            this.lowerData      = low;
+            this.upperData      = up;
+            this.doPaintBetween = between;
+        }
+
+        /** Get name of a facet that is involved in area generation
+         * to induce type (e.g. longitudinal_section.w -> "W over km"). */
+        public String getRootFacetName() {
+            return this.rootFacetName;
+        }
+
+        /** Get data for 'upper' curve of area. */
+        public Object getUpperData() {
+            return this.upperData;
+        }
+
+        /** Get data for 'lower' curve of area. */
+        public Object getLowerData() {
+            return this.lowerData;
+        }
+
+        /** Whether to fill whole area between (in contrast to 'under'
+         *  or 'over'). */
+        public boolean doPaintBetween() {
+            return this.doPaintBetween;
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :