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Commons Math example source code file (DefaultTransformer.java)

This example Commons Math source code file (DefaultTransformer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

conversion, defaulttransformer, exception, exception, io, mathexception, mathexception, number, numbertransformer, object, override, override, serializable, transformation, transformation

The Commons Math DefaultTransformer.java source code

/*
 * 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;

/**
 * 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: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
 */
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 org.apache.commons.math.MathException If it cannot successfully
     * be transformed or is null.
     * @see <a href="http://commons.apache.org/collections/api-release/org/apache/commons/collections/Transformer.html"/>
     */
    public double transform(Object o) throws MathException{

        if (o == null) {
            throw new MathException("Conversion Exception in Transformation, Object is null");
        }

        if (o instanceof Number) {
            return ((Number)o).doubleValue();
        }

        try {
            return Double.valueOf(o.toString()).doubleValue();
        } catch (NumberFormatException e) {
            throw new MathException(e,
                                    "Conversion Exception in Transformation: {0}", 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;
    }

}

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math DefaultTransformer.java source code file:

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