/* * Copyright 2013 - 2014 Felix Müller * * This file is part of CodeQ Invest. * * CodeQ Invest is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * CodeQ Invest 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with CodeQ Invest. If not, see <http://www.gnu.org/licenses/>. */ package org.codeqinvest.codechanges; import org.codeqinvest.codechanges.scm.DailyCodeChurn; import org.codeqinvest.codechanges.scm.factory.CodeChurnCalculatorFactory; import org.joda.time.LocalDate; import java.util.Collection; /** * This {@code CodeChangeProbabilityCalculator} implementation uses * historical scm data to calculate the probability. For that, it loads * the past commit data for the last X days. Every code change from the past * is weighted equally. * * @author fmueller */ public class DefaultCodeChangeProbabilityCalculator extends AbstractCodeChangeProbabilityCalculator { public DefaultCodeChangeProbabilityCalculator(CodeChurnCalculatorFactory codeChurnCalculatorFactory, LocalDate startDay, int days) { super(codeChurnCalculatorFactory, startDay, days); } /** * {@inheritDoc} */ @Override protected double computeChangeProbability(int days, Collection<DailyCodeChurn> codeChurns) { final double numberOfDays = days + 1.0; double changeProbability = 0.0; for (DailyCodeChurn codeChurn : codeChurns) { for (double churnProportion : codeChurn.getCodeChurnProportions()) { changeProbability += churnProportion * (1 / numberOfDays); } } return changeProbability; } }