| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.math.util; |
| |
| import java.io.Serializable; |
| |
| import org.apache.commons.math.MathException; |
| import org.apache.commons.math.exception.util.LocalizedFormats; |
| |
| /** |
| * A Default NumberTransformer for java.lang.Numbers and Numeric Strings. This |
| * provides some simple conversion capabilities to turn any java.lang.Number |
| * into a primitive double or to turn a String representation of a Number into |
| * a double. |
| * |
| * @version $Revision: 1073658 $ $Date: 2011-02-23 10:45:42 +0100 (mer. 23 févr. 2011) $ |
| */ |
| public class DefaultTransformer implements NumberTransformer, Serializable { |
| |
| /** Serializable version identifier */ |
| private static final long serialVersionUID = 4019938025047800455L; |
| |
| /** |
| * @param o the object that gets transformed. |
| * @return a double primitive representation of the Object o. |
| * @throws MathException if it cannot successfully be transformed. |
| * @see <a href="http://commons.apache.org/collections/api-release/org/apache/commons/collections/Transformer.html">Commons Collections Transformer</a> |
| */ |
| public double transform(Object o) throws MathException { |
| if (o == null) { |
| throw new MathException(LocalizedFormats.OBJECT_TRANSFORMATION); |
| } |
| |
| if (o instanceof Number) { |
| return ((Number)o).doubleValue(); |
| } |
| |
| try { |
| return Double.valueOf(o.toString()).doubleValue(); |
| } catch (NumberFormatException e) { |
| throw new MathException(e, |
| LocalizedFormats.CANNOT_TRANSFORM_TO_DOUBLE, e.getMessage()); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean equals(Object other) { |
| if (this == other) { |
| return true; |
| } |
| if (other == null) { |
| return false; |
| } |
| return other instanceof DefaultTransformer; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int hashCode() { |
| // some arbitrary number ... |
| return 401993047; |
| } |
| |
| } |