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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.symbolic.vm.math;

import org.evosuite.symbolic.expr.Operator;
import org.evosuite.symbolic.expr.fp.RealUnaryExpression;
import org.evosuite.symbolic.expr.fp.RealValue;
import org.evosuite.symbolic.vm.SymbolicFunction;
import org.evosuite.symbolic.vm.SymbolicEnvironment;

public final class TAN extends SymbolicFunction {

	private static final String TAN = "tan";

	public TAN(SymbolicEnvironment env) {
		super(env, Types.JAVA_LANG_MATH, TAN, Types.D2D_DESCRIPTOR);
	}

	@Override
	public Object executeFunction() {
		double res = this.getConcDoubleRetVal();
		RealValue realExpression = this.getSymbRealArgument(0);
		RealValue tanExpr;
		if (realExpression.containsSymbolicVariable()) {
			Operator op = Operator.TAN;
			tanExpr = new RealUnaryExpression(realExpression, op, res);
		} else {
			tanExpr = this.getSymbRealRetVal();
		}
		return tanExpr;
	}

}