001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.math.util;
018
019 import org.apache.commons.math.MathException;
020
021 /**
022 * Subclasses implementing this interface can transform Objects to doubles.
023 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
024 *
025 * No longer extends Serializable since 2.0
026 *
027 */
028 public interface NumberTransformer {
029
030 /**
031 * Implementing this interface provides a facility to transform
032 * from Object to Double.
033 *
034 * @param o the Object to be transformed.
035 * @return the double value of the Object.
036 * @throws MathException if the Object can not be transformed into a Double.
037 */
038 double transform(Object o) throws MathException;
039 }