--- a/gnv-artifacts/ChangeLog	Mon Apr 26 09:09:20 2010 +0000
+++ b/gnv-artifacts/ChangeLog	Mon Apr 26 13:31:11 2010 +0000
@@ -1,3 +1,13 @@
+2010-04-26  Ingo Weinzierl <ingo.weinzierl@intevation.de>
+
+	  Issue251
+
+	* src/main/java/de/intevation/gnv/state/SingleInputState.java: Override feed
+	  method for input validation.
+
+	* src/main/java/de/intevation/gnv/utils/InputValidator.java: New case: an
+	  empty string is invalid.
+
 2010-04-26  Tim Englich  <tim.englich@intevation.de>
 
 	  ISSUE252

--- a/gnv-artifacts/src/main/java/de/intevation/gnv/state/SingleInputState.java	Mon Apr 26 09:09:20 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/state/SingleInputState.java	Mon Apr 26 13:31:11 2010 +0000
@@ -1,15 +1,23 @@
 package de.intevation.gnv.state;
 
+import de.intevation.artifacts.CallContext;
+
+import de.intevation.gnv.artifacts.ressource.RessourceFactory;
 import de.intevation.gnv.geobackend.base.Result;
-
 import de.intevation.gnv.state.describedata.DefaultSingleValueDescribeData;
+import de.intevation.gnv.state.exception.StateException;
+import de.intevation.gnv.utils.InputValidator;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Iterator;
 import java.util.List;
+import java.util.Locale;
 
 import org.apache.log4j.Logger;
 
+import org.w3c.dom.Document;
+
 /**
  * This state handles single user input. The user is allowed to select just one
  * value.
@@ -51,5 +59,63 @@
 
         return describeData;
     }
+
+    /**
+     * This feed method needs a collection of two InputData objects. These
+     * objects' values need to be a datetime string which is turned into a Date
+     * object. Afterwards, the given dates are validated. Min and max date need
+     * to be in range of the min and max date retrieved by
+     * {@link #getDescibeData(java.lang.String)}.
+     */
+    @Override
+    public Document feed(
+        CallContext           context,
+        Collection<InputData> inputData,
+        String                uuid)
+    throws StateException {
+        RessourceFactory resFactory = RessourceFactory.getInstance();
+        Locale[] serverLocales      = resFactory.getLocales();
+        Locale locale               = context.getMeta().getPreferredLocale(
+            serverLocales);
+
+        if (inputData == null) {
+            String msg = "No input data given.";
+            log.warn(msg);
+            return feedFailure(msg);
+        }
+
+        Iterator<InputData> it = inputData.iterator();
+        InputData tmpItem      = it.next();
+        InputValue inputValue  = inputValues.get(tmpItem.getName());
+
+        if (inputValue == null) {
+            String msg = resFactory.getRessource(
+                locale,
+                EXCEPTION_INVALID_INPUT,
+                EXCEPTION_INVALID_INPUT);
+            log.warn(msg);
+            return feedFailure(msg);
+        }
+
+        boolean valid = InputValidator.isInputValid(
+            tmpItem.getValue(), inputValue.getType());
+
+        if (valid) {
+            String[] desc = getDescriptionForInputData(tmpItem, uuid);
+            tmpItem.setDescription(desc);
+
+            this.inputData.put(tmpItem.getName(), tmpItem);
+            return feedSuccess();
+        }
+
+        else {
+            String msg = resFactory.getRessource(
+                locale,
+                EXCEPTION_INVALID_INPUT,
+                EXCEPTION_INVALID_INPUT);
+            log.warn(msg);
+            return feedFailure(msg);
+        }
+    }
 }
 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :

--- a/gnv-artifacts/src/main/java/de/intevation/gnv/utils/InputValidator.java	Mon Apr 26 09:09:20 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/utils/InputValidator.java	Mon Apr 26 13:31:11 2010 +0000
@@ -81,6 +81,10 @@
      * @return true if the input is valid, otherwise false.
      */
     public static boolean isInputValid(String input, String type) {
+        if (input.length() == 0 || input.equals("")) {
+            return false;
+        }
+
         log.debug("InputValidator.isInputValid " + input + " " + type);
 
         // Let's check polygons and linestrings first, because they might