--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface/src/org/eclipse/jface/viewers/ITreeContentProvider.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,66 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.jface.viewers.ITreeContentProvider;
+
+import java.lang.all;
+
+import org.eclipse.jface.viewers.IStructuredContentProvider;
+
+/**
+ * An interface to content providers for tree-structure-oriented
+ * viewers.
+ *
+ * @see AbstractTreeViewer
+ */
+public interface ITreeContentProvider : IStructuredContentProvider {
+    /**
+     * Returns the child elements of the given parent element.
+     * <p>
+     * The difference between this method and <code>IStructuredContentProvider.getElements</code>
+     * is that <code>getElements</code> is called to obtain the
+     * tree viewer's root elements, whereas <code>getChildren</code> is used
+     * to obtain the children of a given parent element in the tree (including a root).
+     * </p>
+     * The result is not modified by the viewer.
+     *
+     * @param parentElement the parent element
+     * @return an array of child elements
+     */
+    public Object[] getChildren(Object parentElement);
+
+    /**
+     * Returns the parent for the given element, or <code>null</code>
+     * indicating that the parent can't be computed.
+     * In this case the tree-structured viewer can't expand
+     * a given node correctly if requested.
+     *
+     * @param element the element
+     * @return the parent element, or <code>null</code> if it
+     *   has none or if the parent cannot be computed
+     */
+    public Object getParent(Object element);
+
+    /**
+     * Returns whether the given element has children.
+     * <p>
+     * Intended as an optimization for when the viewer does not
+     * need the actual children.  Clients may be able to implement
+     * this more efficiently than <code>getChildren</code>.
+     * </p>
+     *
+     * @param element the element
+     * @return <code>true</code> if the given element has children,
+     *  and <code>false</code> if it has no children
+     */
+    public bool hasChildren(Object element);
+}