--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/client/ui/AbstractSingleItemPanel.java	Tue May 22 17:44:05 2018 +0200
@@ -0,0 +1,185 @@
+/** 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.ui.FromToTableHelperPanel.IColumnClickHandler;
+import org.dive4elements.river.client.shared.model.Data;
+import org.dive4elements.river.client.shared.model.DataItem;
+import org.dive4elements.river.client.shared.model.DataList;
+import org.dive4elements.river.client.shared.model.DefaultData;
+import org.dive4elements.river.client.shared.model.DefaultDataItem;
+
+import com.smartgwt.client.widgets.Canvas;
+import com.smartgwt.client.widgets.Label;
+import com.smartgwt.client.widgets.form.DynamicForm;
+import com.smartgwt.client.widgets.form.fields.TextItem;
+import com.smartgwt.client.widgets.form.validator.IsIntegerValidator;
+import com.smartgwt.client.widgets.grid.ListGrid;
+import com.smartgwt.client.widgets.layout.HLayout;
+import com.smartgwt.client.widgets.layout.VLayout;
+
+/**
+ * @author Domenico Nardi Tironi
+ *
+ */
+public abstract class AbstractSingleItemPanel extends AbstractUIProvider {
+
+    protected static final String FORM_ID = "FORM_ID";
+
+    protected TextItem inputItem;
+
+    protected List<String> validInputs = new ArrayList<String>();
+
+    protected ListGrid table;
+
+    protected abstract String getDatakey();
+
+    protected abstract void appendValue(final String value);
+
+    protected abstract boolean getTitleVisible();
+
+    protected abstract String errorForItemMsg();
+
+    @Override
+    public Canvas create(final DataList data) {
+        final VLayout layout = new VLayout();
+        final IColumnClickHandler fromHandler = new IColumnClickHandler() { // add to external class
+
+            @Override
+            public void columnClicked(final String value) {
+                appendValue(value);
+            }
+        };
+
+        final FromToTableHelperPanel helper = new FromToTableHelperPanel(data, getDatakey(), this.MSG, fromHandler, null);
+        final Canvas table = helper.getTable();
+        this.validInputs = helper.getKeycolEntries();
+
+        this.helperContainer.addMember(table);
+
+        final Canvas submit = getNextButton();
+        final Canvas widget = createWidget(data);
+
+        layout.addMember(widget);
+        layout.addMember(submit);
+
+        return layout;
+    }
+
+    public Canvas createWidget(final DataList data) {
+        final VLayout layout = new VLayout();
+
+        final Label title = new Label(data.get(0).getDescription());
+        title.setHeight("25px");
+
+        final DynamicForm form = new DynamicForm();
+        form.setID(FORM_ID);
+        form.setNumCols(4);
+        this.inputItem = new TextItem(this.MSG.years());
+        this.inputItem.setShowTitle(getTitleVisible());
+        this.inputItem.setValidators(new IsIntegerValidator()); // TODO: validator to be overriden...
+        form.setFields(this.inputItem);
+
+        layout.addMember(title);
+        layout.addMember(form);
+
+        return layout;
+    }
+
+    @Override
+    public Canvas createOld(final DataList dataList) {
+        final List<Data> items = dataList.getAll();
+        final Data years = getData(items, getDatakey());
+        final DataItem[] yearsItems = years.getItems();
+
+        final String v1 = yearsItems[0].getStringValue().replace(" ", ", ");
+
+        final Label old = new Label(v1);
+        final HLayout layout = new HLayout();
+        layout.setWidth("400px");
+
+        final Label label = new Label(dataList.getLabel());
+        label.setWidth("200px");
+
+        final Canvas back = getBackButton(dataList.getState());
+
+        layout.addMember(label);
+        layout.addMember(old);
+        layout.addMember(back);
+
+        return layout;
+    }
+
+    @Override
+    public List<String> validate() {
+        final List<String> errors = new ArrayList<String>();
+
+        if (this.inputItem.getValueAsString() == null || this.inputItem.getValueAsString().trim().isEmpty()) {
+            errors.add(this.MSG.empty_filter());
+            return errors;
+        }
+        final String sValue = this.inputItem.getValueAsString();
+        String filtered = "";
+        int goodValues = 0;
+
+        int value = 0;
+        try {
+            value = Integer.parseInt(sValue);
+        }
+        catch (final NumberFormatException e) {
+            errors.add(this.MSG.wrongFormat() + ": " + sValue);
+
+        }
+        boolean isGood = false;
+        for (final String validYear : this.validInputs) {
+            /* No list contains for strings? */
+            if (sValue.equals(validYear)) {
+                isGood = true;
+                break;
+            }
+        }
+        if (!isGood) {
+            String tmp = errorForItemMsg();
+            tmp = tmp.replace("$1", sValue);
+            errors.add(tmp);
+            // continue;
+        }
+        goodValues++;
+        if (goodValues > 1) {
+            filtered += " " + Integer.toString(value);
+        } else {
+            filtered = Integer.toString(value);
+        }
+
+        return errors;
+    }
+
+    @Override
+    protected Data[] getData() {
+        final List<String> errors = this.validate();
+        if (errors.size() > 0) {
+            showErrors(errors); // TODO: do not allow advance state
+            // return null;
+        }
+        if (this.inputItem != null && !this.inputItem.getValueAsString().isEmpty()) {
+            final List<Data> data = new ArrayList<Data>();
+
+            final DataItem yearsdata = new DefaultDataItem(getDatakey(), getDatakey(), this.inputItem.getValueAsString().trim());
+            data.add(new DefaultData(getDatakey(), null, null, new DataItem[] { yearsdata }));
+
+            return data.toArray(new Data[data.size()]);
+        }
+        return new Data[0];
+    }
+
+}