--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/client/ui/ValidationHelper.java	Tue Jul 17 10:59:27 2018 +0200
@@ -0,0 +1,33 @@
+/** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
+ * Software engineering by
+ *  Björnsen Beratende Ingenieure GmbH
+ *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
+ *
+ * This file is Free Software under the GNU AGPL (>=v3)
+ * and comes with ABSOLUTELY NO WARRANTY! Check out the
+ * documentation coming with Dive4Elements River for details.
+ */
+package org.dive4elements.river.client.client.ui;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.dive4elements.river.client.client.FLYSConstants;
+
+import com.smartgwt.client.widgets.form.fields.TextItem;
+
+/**
+ * @author Domenico Nardi Tironi
+ *
+ */
+public class ValidationHelper {
+    public static final List<String> checkForEmpty(final TextItem inputItem, final FLYSConstants MSG) {
+        final List<String> errors = new ArrayList<String>();
+
+        if (inputItem.getValueAsString() == null || inputItem.getValueAsString().trim().isEmpty()) {
+            errors.add(MSG.empty_filter());
+            return errors;
+        }
+        return errors;
+    }
+}