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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2012 Andy Jefferson and others. All rights reserved.
Licensed 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.

Contributors:
    ...
**********************************************************************/
package org.datanucleus.query.inmemory;

/**
 * Evaluator for the function ATAN(numExpr).
 */
public class ArcTangentFunction extends MathFunction
{
    /* (non-Javadoc)
     * @see org.datanucleus.query.evaluator.memory.MathFunctionEvaluator#getFunctionName()
     */
    @Override
    protected String getFunctionName()
    {
        return "atan";
    }

    /* (non-Javadoc)
     * @see org.datanucleus.query.evaluator.memory.MathFunctionEvaluator#evaluateMathFunction(double)
     */
    @Override
    protected double evaluateMathFunction(double num)
    {
        return Math.atan(num);
    }
}