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1   /*
2    * Copyright 2003-2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.math.util;
17  
18  import org.apache.commons.math.MathException;
19  
20  /**
21   * Subclasses implementing this interface can transform Objects to doubles.
22   * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
23   */
24  public interface NumberTransformer {
25      
26      /**
27       * Implementing this interface provides a facility to transform
28       * from Object to Double.
29       * 
30       * @param o the Object to be transformed.
31       * @return the double value of the Object.
32       * @throws MathException if the Object can not be transformed into a Double. 
33       */
34      double transform(Object o) throws MathException;
35  }