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diff --git a/src/main/java/org/apache/commons/math/util/NumberTransformer.java b/src/main/java/org/apache/commons/math/util/NumberTransformer.java
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+++ b/src/main/java/org/apache/commons/math/util/NumberTransformer.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.commons.math.util;
+
+import org.apache.commons.math.MathException;
+
+/**
+ * Subclasses implementing this interface can transform Objects to doubles.
+ * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
+ *
+ * No longer extends Serializable since 2.0
+ *
+ */
+public interface NumberTransformer {
+
+    /**
+     * Implementing this interface provides a facility to transform
+     * from Object to Double.
+     *
+     * @param o the Object to be transformed.
+     * @return the double value of the Object.
+     * @throws MathException if the Object can not be transformed into a Double.
+     */
+    double transform(Object o) throws MathException;
+}