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 java.io.Serializable; 20 21 import org.apache.commons.math.MathException; 22 23 /** 24 * Subclasses implementing this interface can transform Objects to doubles. 25 * @version $Revision: 611497 $ $Date: 2008-01-12 15:07:09 -0700 (Sat, 12 Jan 2008) $ 26 */ 27 public interface NumberTransformer extends Serializable { 28 29 /** 30 * Implementing this interface provides a facility to transform 31 * from Object to Double. 32 * 33 * @param o the Object to be transformed. 34 * @return the double value of the Object. 35 * @throws MathException if the Object can not be transformed into a Double. 36 */ 37 double transform(Object o) throws MathException; 38 }