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 17 package org.apache.commons.math.util; 18 19 import java.io.Serializable; 20 21 import org.apache.commons.math.MathException; 22 23 /** 24 * A Default NumberTransformer for java.lang.Numbers and Numeric Strings. This 25 * provides some simple conversion capabilities to turn any java/lang.Number 26 * into a primitive double or to turn a String representation of a Number into 27 * a double. 28 * 29 * @version $Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $ 30 */ 31 public class DefaultTransformer implements NumberTransformer, Serializable { 32 33 /** Serializable version identifier */ 34 private static final long serialVersionUID = 4019938025047800455L; 35 36 /** 37 * @param o the object that gets transformed. 38 * @return a double primitive representation of the Object o. 39 * @throws org.apache.commons.math.MathException If it cannot successfully 40 * be transformed or is null. 41 * @see org.apache.commons.collections.Transformer#transform(java.lang.Object) 42 */ 43 public double transform(Object o) throws MathException{ 44 45 if (o == null) { 46 throw new MathException("Conversion Exception in Transformation, Object is null"); 47 } 48 49 if (o instanceof Number) { 50 return ((Number)o).doubleValue(); 51 } 52 53 try { 54 return new Double(o.toString()).doubleValue(); 55 } catch (Exception e) { 56 throw new MathException("Conversion Exception in Transformation: " + e.getMessage(), e); 57 } 58 } 59 }