1 files changed, 41 insertions, 0 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/ReverseComparator.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/ReverseComparator.java
new file mode 100644
index 0000000000..16ff4584d5
--- /dev/null
+++ b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/ReverseComparator.java
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2007 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.utility.internal;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+/**
+ * This comparator will reverse the order of the specified comparator.
+ * If the comparator is null, the natural ordering of the objects will be used.
+ */
+public class ReverseComparator<E extends Comparable<? super E>>
+	implements Comparator<E>, Serializable
+{
+	private final Comparator<E> comparator;
+
+	public ReverseComparator() {
+		this(null);
+	}
+
+	public ReverseComparator(Comparator<E> comparator) {
+		super();
+		this.comparator = comparator;
+	}
+
+	@SuppressWarnings("unchecked")
+	public int compare(E e1, E e2) {
+		return (this.comparator == null) ?
+			e2.compareTo(e1)
+		:
+			this.comparator.compare(e2, e1);
+	}
+
+}