JFX: Content Provider for Lists/Streams of no-child elements

Issue-Ref: 3541
Issue-Url: https://af3-developer.fortiss.org/issues/3541


Signed-off-by: Alexander Diewald <diewald@fortiss.org>

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings

@@ -9,5 +9,6 @@ DynamicTreeTableViewer.java 129fdcd259e5b7f2528dfeb407676528dcc694be YELLOW
 DynamicTreeUIProviderBase.java e9b68607683de279d0cb8712a28dc131c5c33ece GREEN
 DynamicTreeViewer.java 8c20c0941bd299afce1cf237c8e29e21821c2631 YELLOW
 DynamicTreeViewerBase.java a2013538b62d86f6a09efdf2cd78babac2072484 GREEN
+EmptyChildrenContentProvider.java 51b4468f9df8423abeea5ac6aa2f6cf99c2eb512 YELLOW
 IDoubleClickHandler.java 447f7769dead9a106b3ea3139ef0da51eb0b9a89 GREEN
 IDynamicItem.java 083d02459e7ec33542d9910c04abe2581e0b5422 YELLOW

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/EmptyChildrenContentProvider.java

+/*-------------------------------------------------------------------------+
+| Copyright 2019 fortiss GmbH                                              |
+|                                                                          |
+| Licensed under the Apache License, Version 2.0 (the "License");          |
+| you may not use this file except in compliance with the License.         |
+| You may obtain a copy of the License at                                  |
+|                                                                          |
+|    http://www.apache.org/licenses/LICENSE-2.0                            |
+|                                                                          |
+| Unless required by applicable law or agreed to in writing, software      |
+| distributed under the License is distributed on an "AS IS" BASIS,        |
+| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
+| See the License for the specific language governing permissions and      |
+| limitations under the License.                                           |
++--------------------------------------------------------------------------*/
+package org.fortiss.tooling.common.ui.javafx.control.treetableview;
+
+import static java.util.Collections.emptyList;
+
+import java.util.Collection;
+
+/**
+ * Dummy {@link DynamicListContentProvider} for collections whose elements do not provide further
+ * children.
+ * 
+ * @author diewald
+ */
+public class EmptyChildrenContentProvider<T> extends DynamicListContentProvider<T> {
+
+	/** {@inheritDoc} */
+	@Override
+	protected Collection<T> getChildren(T parent) {
+		return emptyList();
+	}
+}