--- a/flys-artifacts/ChangeLog	Thu Sep 29 18:19:45 2011 +0000
+++ b/flys-artifacts/ChangeLog	Fri Sep 30 05:31:34 2011 +0000
@@ -1,3 +1,8 @@
+2011-09-30  Felix Wolfsteller <felix.wolfsteller@intevation.de>
+
+	* src/main/java/de/intevation/flys/artifacts/states/WaterlevelPairSelectState.java:
+	  (createStaticData, getLabels): Create proper labels for differences.
+
 2011-09-29	Sascha L. Teichmann	<sascha.teichmann@intevation.de>
 
 	flys/issue244 (WINFO: Export von AT-Dateien im ersten Teil unterschiedlich)

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelPairSelectState.java	Thu Sep 29 18:19:45 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelPairSelectState.java	Fri Sep 30 05:31:34 2011 +0000
@@ -4,13 +4,25 @@
 
 import org.apache.log4j.Logger;
 
+import org.w3c.dom.Element;
+
 import de.intevation.artifacts.CallContext;
 
+import de.intevation.artifactdatabase.data.DefaultStateData;
+import de.intevation.artifactdatabase.data.StateData;
 import de.intevation.artifactdatabase.state.Facet;
 
+import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
+
 import de.intevation.flys.artifacts.FLYSArtifact;
+import de.intevation.flys.artifacts.model.CalculationResult;
+import de.intevation.flys.artifacts.model.FacetTypes;
+import de.intevation.flys.artifacts.model.WQKms;
+import de.intevation.flys.artifacts.resources.Resources;
 
-import de.intevation.flys.artifacts.model.FacetTypes;
+import de.intevation.flys.utils.FLYSUtils;
+import de.intevation.flys.utils.StringUtil;
+
 
 
 public class WaterlevelPairSelectState
@@ -20,6 +32,12 @@
     /** The logger that is used in this state. */
     private static Logger logger = Logger.getLogger(WaterlevelPairSelectState.class);
 
+
+    // TODO fix (state.winfo.waterlevel)
+    // own id is state.winfo.waterlevel_pair_select
+    public static final String WINFO_WDIFFERENCES_STATE_ID
+        = "state.winfo.w_differences";
+
     public WaterlevelPairSelectState() {
     }
 
@@ -42,5 +60,99 @@
         //Get data and do stuff, do not calculate
         return "";
     }
+
+
+    /**
+     * Creats the data element used for the static part of DESCRIBE document.
+     */
+    @Override
+    protected Element createStaticData(
+        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;
+    }
+
+
+    // TODO merge implementations with WaterlevelSelectState
+    /**
+     * 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(";");
+            String[] subtrahendParts = StringUtil
+                .unbracket(recommendations[i+1])
+                .split(";");
+
+    
+            FLYSArtifact artifact1 = FLYSUtils.getArtifact(minuendParts[0], cc);
+    
+            CalculationResult rawData1 = (CalculationResult) artifact1.compute(
+                cc,
+                null,
+                "state.winfo.waterlevel",
+                ComputeType.ADVANCE,
+                false);
+            WQKms[] wqkms1 = (WQKms[]) rawData1.getData();
+    
+            int idx1 = -1;
+            try {
+                idx1 = Integer.parseInt(minuendParts[2]);
+            }
+            catch (NumberFormatException nfe) { /* do nothing */ }
+
+            FLYSArtifact artifact2 = FLYSUtils.getArtifact(subtrahendParts[0], cc);
+    
+            CalculationResult rawData2 = (CalculationResult) artifact2.compute(
+                cc,
+                null,
+                "state.winfo.waterlevel",
+                ComputeType.ADVANCE,
+                false);
+            WQKms[] wqkms2 = (WQKms[]) rawData2.getData();
+    
+            int idx2 = -1;
+            try {
+                idx2 = Integer.parseInt(subtrahendParts[2]);
+            }
+            catch (NumberFormatException nfe) { /* do nothing */ }
+
+            displayString += "(" + StringUtil.wWrap(wqkms1[idx1].getName()) 
+                + " - " + StringUtil.wWrap(wqkms2[idx2].getName()) + ")";
+        }
+
+        return new String[] { displayString };
+    }
+
 }
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