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/*
* 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;
}
}
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