Add HasHierarchicalDataProvider#setTreeData

Additionally removes TreeData constructors from Tree and TreeGrid.

server/src/main/java/com/vaadin/data/HasHierarchicalDataProvider.java

@@ -37,6 +37,16 @@ import com.vaadin.data.provider.TreeDataProvider;
  */
 public interface HasHierarchicalDataProvider<T> extends HasDataProvider<T> {
 
+    /**
+     * Sets a new {@link TreeDataProvider} wrapping the given {@link TreeData}.
+     *
+     * @param treeData
+     *            the tree data to set
+     */
+    public default void setTreeData(TreeData<T> treeData) {
+        setDataProvider(new TreeDataProvider<>(treeData));
+    }
+
     /**
      * Gets the backing {@link TreeData} instance of the data provider, if the
      * data provider is a {@link TreeDataProvider}.
@@ -51,7 +61,8 @@ public interface HasHierarchicalDataProvider<T> extends HasDataProvider<T> {
         if (getDataProvider() instanceof TreeDataProvider) {
             return ((TreeDataProvider<T>) getDataProvider()).getTreeData();
         } else {
-            throw new IllegalStateException("");
+            throw new IllegalStateException(
+                    "Data provider is not an instance of TreeDataProvider");
         }
     }
 

server/src/main/java/com/vaadin/ui/Tree.java

@@ -260,16 +260,6 @@ public class Tree<T> extends Composite
         treeGrid.setDataProvider(dataProvider);
     }
 
-    /**
-     * Constructs a new Tree Component with given {@code TreeData}.
-     *
-     * @param treeData
-     *            the tree data for component
-     */
-    public Tree(TreeData<T> treeData) {
-        this(null, new TreeDataProvider<>(treeData));
-    }
-
     /**
      * Constructs a new Tree Component with given
      * {@code HierarchicalDataProvider}.

server/src/main/java/com/vaadin/ui/TreeGrid.java

@@ -106,23 +106,6 @@ public class TreeGrid<T> extends Grid<T>
         setDataProvider(dataProvider);
     }
 
-    /**
-     * Creates a {@code TreeGrid} using the given in-memory data, without
-     * support for creating columns based on property names. Use an alternative
-     * constructor, such as {@link TreeGrid#TreeGrid(Class)}, to create a
-     * {@code TreeGrid} that automatically sets up columns based on the type of
-     * presented data.
-     *
-     * @see TreeData
-     *
-     * @param data
-     *            the data to use, not {@code null}
-     */
-    public TreeGrid(TreeData<T> data) {
-        this();
-        setDataProvider(new TreeDataProvider<>(data));
-    }
-
     /**
      * Creates a {@code TreeGrid} using a custom {@link PropertySet}
      * implementation and custom data communicator.
@@ -551,7 +534,7 @@ public class TreeGrid<T> extends Grid<T>
 
     /**
      * Gets the item collapse allowed provider.
-     * 
+     *
      * @return the item collapse allowed provider
      */
     public ItemCollapseAllowedProvider<T> getItemCollapseAllowedProvider() {