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: 777530 $ $Date: 2009-05-22 10:04:56 -0400 (Fri, 22 May 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 }