01: /*
02: * Copyright 2003-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: }
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