--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/states/WaterlevelPairSelectState.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,162 @@
+package org.dive4elements.river.artifacts.states;
+
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Element;
+
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.CallContext;
+
+import org.dive4elements.artifactdatabase.ProtocolUtils;
+import org.dive4elements.artifactdatabase.state.Facet;
+
+import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
+
+import org.dive4elements.river.artifacts.FLYSArtifact;
+import org.dive4elements.river.artifacts.model.FacetTypes;
+import org.dive4elements.river.artifacts.resources.Resources;
+
+import org.dive4elements.river.utils.StringUtil;
+
+/**
+ * State in which the user selects 1 to n pairs of Waterlevels and alikes.
+ */
+public class WaterlevelPairSelectState
+extends      DefaultState
+implements   FacetTypes
+{
+    /** The logger that is used in this state. */
+    private static Logger logger = Logger.getLogger(
+         WaterlevelPairSelectState.class);
+
+
+    /** Trivial constructor. */
+    public WaterlevelPairSelectState() {
+    }
+
+
+    /** Specify to display a datacage_twin_panel. */
+    @Override
+    protected String getUIProvider() {
+        return "datacage_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 "";
+    }
+
+
+    /**
+     * Create elements for document (prepopulated with data, if any).
+     * @param artifact FLYSArtifact to get data from.
+     * @param name DataName, expceted to be "diffids".
+     */
+    @Override
+    protected Element[] createItems(
+        ElementCreator cr,
+        Artifact    artifact,
+        String      name,
+        CallContext context)
+    {
+        logger.debug("createItems: " + name);
+        if (name.equals("diffids")) {
+            Element item  = ProtocolUtils.createArtNode(cr, "item", null, null);
+            Element label = ProtocolUtils.createArtNode(cr, "label", null, null);
+            Element value = ProtocolUtils.createArtNode(cr, "value", null, null);
+            FLYSArtifact flys = (FLYSArtifact) artifact;
+            String s = flys.getDataAsString("diffids");
+            value.setTextContent(s);
+            item.appendChild(label);
+            item.appendChild(value);
+            return new Element[] { item };
+        }
+        return new Element[] {};
+    }
+
+
+    /**
+     * Creats 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);
+        Object[] obj    = new Object[] { labels[0] };
+
+        // TODO own i18n
+        String attrValue = Resources.getMsg(
+            cc.getMeta(), "wsp.selected.string", "wsp.selected.string", obj);
+        //I18N_STATIC_KEY, I18N_STATIC_KEY, obj);
+
+        creator.addAttr(itemElement, "label", attrValue, 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
+        // like "W (Q=1) - W (Q=2)".
+        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 :