--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/minfo/DifferenceSelect.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,135 @@
+package org.dive4elements.river.artifacts.states.minfo;
+
+import java.util.List;
+
+import org.w3c.dom.Element;
+
+import org.dive4elements.artifactdatabase.state.Facet;
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.CallContext;
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
+import org.dive4elements.river.artifacts.FLYSArtifact;
+import org.dive4elements.river.artifacts.access.BedHeightAccess;
+import org.dive4elements.river.artifacts.states.DefaultState;
+import org.dive4elements.river.utils.StringUtil;
+
+/**
+ * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
+ */
+public class DifferenceSelect extends DefaultState {
+
+    /**
+     * The default constructor that initializes an empty State object.
+     */
+    public DifferenceSelect() {
+    }
+    /**
+     *  Specify to display nothing (this is kind of a "final" state).
+     */
+    @Override
+    protected String getUIProvider() {
+        return "bedheights_twin_panel";
+    }
+
+    /**
+     * Overridden to do nothing.
+     */
+    @Override
+    public Object computeAdvance(
+        FLYSArtifact artifact,
+        String       hash,
+        CallContext  context,
+        List<Facet>  facets,
+        Object       old
+    ) {
+        //Get data and do stuff, do not calculate
+        return "";
+    }
+
+    @Override
+    protected Element[] createItems(
+        XMLUtils.ElementCreator ec,
+        Artifact                artifact,
+        String                  name,
+        CallContext             context)
+    {
+        Element[] elements = new Element[1];
+        BedHeightAccess bha = new BedHeightAccess((FLYSArtifact)artifact, context);
+        String time = bha.getYearEpoch();
+        elements[0] = createItem(
+            ec,
+            new String[] {"year-epoch", time});
+
+        return elements;
+    }
+
+    /**
+     * Creates the data element used for the static part of DESCRIBE document.
+     */
+    @Override
+    protected Element createStaticData(
+        FLYSArtifact   flys,
+        ElementCreator creator,
+        CallContext    cc,
+        String         name,
+        String         value,
+        String         type
+    ) {
+        Element dataElement = creator.create("data");
+        creator.addAttr(dataElement, "name", name, true);
+        creator.addAttr(dataElement, "type", type, true);
+
+        Element itemElement = creator.create("item");
+        creator.addAttr(itemElement, "value", value, true);
+
+        String[] labels = getLabels(cc, value);
+
+        creator.addAttr(
+            itemElement,
+            "label",
+            labels[0],
+            true);
+        dataElement.appendChild(itemElement);
+
+        return dataElement;
+    }
+
+
+    /**
+     * Get name to display for selected watelerlevels (for example "Q=123")
+     * from the CalculationResult.
+     */
+    public static String[] getLabels(CallContext cc, String value) {
+        String[] recommendations = value.split("#");
+        String displayString = "";
+
+        // Walk over all selected recommendations and create label
+        for (int i = 0; i < recommendations.length; i+=2) {
+            String[] minuendParts = StringUtil
+                .unbracket(recommendations[i+0])
+                .split(";");
+            if(minuendParts.length >= 4) {
+                displayString += "(" + minuendParts[3];
+            }
+            else {
+                displayString += "([error]";
+            }
+
+            displayString += " - ";
+
+            String[] subtrahendParts = StringUtil
+                .unbracket(recommendations[i+1])
+                .split(";");
+            if(subtrahendParts.length >= 4) {
+                displayString += subtrahendParts[3] + ") ";
+            }
+            else {
+                displayString += "[error])";
+            }
+        }
+
+        return new String[] { displayString };
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :