/* * 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 lombok.extern.slf4j.Slf4j; import org.codeqinvest.codechanges.scm.CodeChurn; import org.codeqinvest.codechanges.scm.CodeChurnCalculationException; import org.codeqinvest.codechanges.scm.CodeChurnCalculator; import org.codeqinvest.codechanges.scm.ScmConnectionEncodingException; import org.codeqinvest.codechanges.scm.ScmConnectionSettings; import org.codeqinvest.codechanges.scm.factory.CodeChurnCalculatorFactory; /** * This code change probability calculator uses a fixed number of * the last commits to estimate the change probability of a file. * * @author fmueller */ @Slf4j public class CommitBasedCodeChangeProbabilityCalculator implements CodeChangeProbabilityCalculator { private final CodeChurnCalculatorFactory codeChurnCalculatorFactory; private final int numberOfCommits; public CommitBasedCodeChangeProbabilityCalculator(CodeChurnCalculatorFactory codeChurnCalculatorFactory, int numberOfCommits) { this.codeChurnCalculatorFactory = codeChurnCalculatorFactory; this.numberOfCommits = numberOfCommits; } /** * {@inheritDoc} */ @Override public double calculateCodeChangeProbability(ScmConnectionSettings connectionSettings, String file) throws CodeChurnCalculationException, ScmConnectionEncodingException { log.info("Calculate code change probability for file {}", file); final CodeChurnCalculator codeChurnCalculator = codeChurnCalculatorFactory.create(connectionSettings); CodeChurn codeChurn = codeChurnCalculator.calculateCodeChurnForLastCommits(connectionSettings, file, numberOfCommits); double changeProbability = 0.0; for (Double codeChurnProportion : codeChurn.getCodeChurnProportions()) { changeProbability += codeChurnProportion * (1 / (double) numberOfCommits); } return Math.min(1.0, changeProbability); } }