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EvalEx is a handy expression evaluator for Java, that allows to evaluate simple mathematical and boolean expressions.

There is a newer version: 2.7

/*
 * Copyright 2018 Udo Klimaschewski
 * 
 * http://UdoJava.com/
 * http://about.me/udo.klimaschewski
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package com.udojava.evalex;

import java.math.BigDecimal;
import java.util.List;

/**
 * Base interface which is required for all directly evaluated functions.
 */
public interface Function extends LazyFunction {

	/**
	 * Implementation for this function.
	 *
	 * @param parameters
	 *            Parameters will be passed by the expression evaluator as a
	 *            {@link List} of {@link BigDecimal} values.
	 * @return The function must return a new {@link BigDecimal} value as a
	 *         computing result.
	 */
	public abstract BigDecimal eval(List parameters);
}