1 files changed, 60 insertions, 0 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.ui/src/org/eclipse/jpt/ui/internal/jface/NullTreeContentProvider.java b/jpa/plugins/org.eclipse.jpt.ui/src/org/eclipse/jpt/ui/internal/jface/NullTreeContentProvider.java
new file mode 100644
index 0000000000..fdb7e0ad36
--- /dev/null
+++ b/jpa/plugins/org.eclipse.jpt.ui/src/org/eclipse/jpt/ui/internal/jface/NullTreeContentProvider.java
@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * Copyright (c) 2006, 2008 Oracle. 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:
+ *     Oracle - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.jpt.ui.internal.jface;
+
+import org.eclipse.jface.viewers.ITreeContentProvider;
+import org.eclipse.jface.viewers.Viewer;
+
+/**
+ * Null implementation of the ILabelProvider interface.
+ * Implemented as a singleton.
+ */
+public final class NullTreeContentProvider
+	implements ITreeContentProvider 
+{
+	private static final Object[] EMPTY_ARRAY = new Object[0];
+	public static final NullTreeContentProvider INSTANCE = new NullTreeContentProvider();
+
+	public static ITreeContentProvider instance() {
+		return INSTANCE;
+	}
+
+	/**
+	 * Ensure a single instance.
+	 */
+	private NullTreeContentProvider() {
+		super();
+	}
+
+	public Object[] getChildren(Object parentElement) {
+		return EMPTY_ARRAY;
+	}
+
+	public Object getParent(Object element) {
+		return null;
+	}
+
+	public boolean hasChildren(Object element) {
+		return false;
+	}
+
+	public Object[] getElements(Object inputElement) {
+		return EMPTY_ARRAY;
+	}
+
+	public void dispose() {
+		// do nothing
+	}
+
+	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+		// do nothing
+	}
+
+}