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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.coverage.rho;

import org.evosuite.ga.SecondaryObjective;
import org.evosuite.testsuite.TestSuiteChromosome;

/**
 * RhoTestSuiteSecondaryObjective class.
 * 
 * @author José Campos
 */
public class RhoTestSuiteSecondaryObjective extends SecondaryObjective {

	private static final long serialVersionUID = 3483170260455441964L;

	private double getRhoFitnessValue(TestSuiteChromosome suite) {
		RhoCoverageSuiteFitness fitness = new RhoCoverageSuiteFitness();
		return fitness.getFitness(suite, false);
	}

	/** {@inheritDoc} */
	@Override
	public int compareChromosomes(TestSuiteChromosome suite1, TestSuiteChromosome suite2) {
		double c1 = this.getRhoFitnessValue(suite1);
		double c2 = this.getRhoFitnessValue(suite2);

		if (c1 == c2) {
			return 0;
		} else if (c1 < c2) {
			// the Chromosome with the lowest rho value should be ranked first
			return -1;
		} else {
			return 1;
		}
	}

	/** {@inheritDoc} */
	@Override
	public int compareGenerations(TestSuiteChromosome parent1, TestSuiteChromosome parent2,
			TestSuiteChromosome child1, TestSuiteChromosome child2) {
		// this function is not used
		throw new RuntimeException(
				"compareGenerations function of " + RhoTestSuiteSecondaryObjective.class.getCanonicalName()
						+ " has not been implemented yet");
	}
}