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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.math.util;
18  
19  import org.apache.commons.math.MathException;
20  
21  /**
22   * Subclasses implementing this interface can transform Objects to doubles.
23   * @version $Revision: 777530 $ $Date: 2009-05-22 10:04:56 -0400 (Fri, 22 May 2009) $
24   * 
25   * No longer extends Serializable since 2.0
26   * 
27   */
28  public interface NumberTransformer {
29      
30      /**
31       * Implementing this interface provides a facility to transform
32       * from Object to Double.
33       * 
34       * @param o the Object to be transformed.
35       * @return the double value of the Object.
36       * @throws MathException if the Object can not be transformed into a Double. 
37       */
38      double transform(Object o) throws MathException;
39  }