Hierarchical data (#8842)

* Initial HierarchicalDataProvider for TreeGrid
* Initial in-memory hierarchical data implementation
* TreeGrid declarative support

Fixes #8611, Fixes #8620 

3 files changed, 57 insertions, 3 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/data/DataCommunicatorClientRpc.java b/shared/src/main/java/com/vaadin/shared/data/DataCommunicatorClientRpc.java
index 501b803cd2..d268c887c4 100644
--- a/shared/src/main/java/com/vaadin/shared/data/DataCommunicatorClientRpc.java
+++ b/shared/src/main/java/com/vaadin/shared/data/DataCommunicatorClientRpc.java
@@ -56,5 +56,24 @@ public interface DataCommunicatorClientRpc extends ClientRpc {
      */
     void updateData(JsonArray data);
 
-    // TODO: Notify add / remove
+    /**
+     * Informs that new data has been inserted from the server.
+     *
+     * @param firstRowIndex
+     *            the destination index of the new row data
+     * @param count
+     *            the number of rows inserted
+     */
+    void insertRows(int firstRowIndex, int count);
+
+    /**
+     * Informs that the server has removed data.
+     *
+     * @param firstRowIndex
+     *            the index of the first removed row
+     * @param count
+     *            the number of removed rows, starting from
+     *            <code>firstRowIndex</code>
+     */
+    void removeRows(int firstRowIndex, int count);
 }
diff --git a/shared/src/main/java/com/vaadin/shared/extension/datacommunicator/HierarchicalDataCommunicatorState.java b/shared/src/main/java/com/vaadin/shared/extension/datacommunicator/HierarchicalDataCommunicatorState.java
new file mode 100644
index 0000000000..e56dbfe8a2
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/extension/datacommunicator/HierarchicalDataCommunicatorState.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * 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 com.vaadin.shared.extension.datacommunicator;
+
+/**
+ * Shared state for HierarchicalDataCommunicator.
+ *
+ * @since
+ */
+public class HierarchicalDataCommunicatorState extends DataCommunicatorState {
+
+}
diff --git a/shared/src/main/java/com/vaadin/shared/ui/treegrid/NodeCollapseRpc.java b/shared/src/main/java/com/vaadin/shared/ui/treegrid/NodeCollapseRpc.java
index 719e5ba183..1b16203648 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/treegrid/NodeCollapseRpc.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/treegrid/NodeCollapseRpc.java
@@ -20,12 +20,22 @@ import com.vaadin.shared.communication.ServerRpc;
 /**
  * RPC to handle client originated collapse and expand actions on hierarchical
  * rows in TreeGrid.
- * 
+ *
  * @author Vaadin Ltd
  * @since 8.1
  */
 @FunctionalInterface
 public interface NodeCollapseRpc extends ServerRpc {
 
-    void toggleCollapse(String rowKey);
+    /**
+     * Sets the collapse state of a hierarchical row in TreeGrid.
+     *
+     * @param rowKey
+     *            the row's key
+     * @param rowIndex
+     *            index where the row is in grid (all rows)
+     * @param collapse
+     *            {@code true} to collapse, {@code false} to expand
+     */
+    void setNodeCollapsed(String rowKey, int rowIndex, boolean collapse);
 }