--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelSelectState.java	Thu Sep 15 15:10:04 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelSelectState.java	Thu Sep 15 15:36:05 2011 +0000
@@ -1,13 +1,122 @@
 package de.intevation.flys.artifacts.states;
 
+import org.apache.log4j.Logger;
+
+import de.intevation.artifacts.Artifact;
+import de.intevation.artifacts.CallContext;
+
+import de.intevation.artifactdatabase.data.DefaultStateData;
+import de.intevation.artifactdatabase.data.StateData;
+
+import de.intevation.flys.artifacts.FLYSArtifact;
+import de.intevation.flys.utils.FLYSUtils;
+
+
 /**
  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
  */
 public class WaterlevelSelectState extends DefaultState {
 
+    private static final Logger logger =
+        Logger.getLogger(WaterlevelSelectState.class);
+
+    public static final String SPLIT_CHAR = ";";
+
+
     @Override
     protected String getUIProvider() {
         return "wsp_datacage_panel";
     }
+
+
+    @Override
+    public StateData transform(
+        FLYSArtifact flys,
+        CallContext  cc,
+        String       name,
+        String       val
+    ) {
+        if (!isValueValid(val)) {
+            logger.error("The given input string is not valid: '" + val + "'");
+            return null;
+        }
+
+        return new DefaultStateData(name, null, null, strip(val));
+    }
+
+
+    @Override
+    public boolean validate(Artifact artifact)
+    throws IllegalArgumentException
+    {
+        FLYSArtifact flys = (FLYSArtifact) artifact;
+
+        StateData data = flys.getData("wsp");
+
+        if (data == null) {
+            throw new IllegalArgumentException("WSP is empty");
+        }
+
+        return true;
+    }
+
+
+    public static String strip(String value) {
+        int start = value.indexOf("[");
+        int end   = value.indexOf("]");
+
+        if (start < 0 || end < 0) {
+            return value;
+        }
+
+        value = value.substring(start+1, end);
+
+        return value;
+    }
+
+
+    /**
+     * Validates the given String. A valid string for this state requires the
+     * format: "UUID;FACETNAME;FACETINDEX".
+     *
+     * @param value The string value requires validation.
+     *
+     * @return true, if the string applies the specified format, otherwise
+     * false.
+     */
+    public static boolean isValueValid(String value) {
+        logger.debug("Validate string: '" + value + "'");
+
+        value = strip(value);
+
+        logger.debug("Validate substring: '" + value + "'");
+
+        if (value == null || value.length() == 0) {
+            return false;
+        }
+
+        String[] parts = value.split(SPLIT_CHAR);
+
+        if (parts == null || parts.length < 3) {
+            return false;
+        }
+
+        if (parts[0] == null || parts[0].length() == 0) {
+            return false;
+        }
+
+        if (parts[1] == null || parts[1].length() == 0) {
+            return false;
+        }
+
+        try {
+            Integer.parseInt(parts[2]);
+        }
+        catch (NumberFormatException nfe) {
+            logger.error("Index is not a valid integer!", nfe);
+        }
+
+        return true;
+    }
 }
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