001/* 002 * SonarQube, open source software quality management tool. 003 * Copyright (C) 2008-2013 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * SonarQube is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * SonarQube is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public License 017 * along with this program; if not, write to the Free Software Foundation, 018 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 019 */ 020package org.sonar.api.measures; 021 022import java.util.Collection; 023import java.util.Collections; 024import java.util.List; 025 026/** 027 * @since 2.0 028 */ 029public class MeanAggregationFormula implements Formula { 030 031 private boolean forceZeroIfMissingData=false; 032 033 public MeanAggregationFormula(boolean forceZeroIfMissingData) { 034 this.forceZeroIfMissingData = forceZeroIfMissingData; 035 } 036 037 public MeanAggregationFormula() { 038 this(false); 039 } 040 041 public List<Metric> dependsUponMetrics() { 042 return Collections.emptyList(); 043 } 044 045 public Measure calculate(FormulaData data, FormulaContext context) { 046 double sum=0.0; 047 int count=0; 048 boolean hasValue=false; 049 Collection<Measure> measures = data.getChildrenMeasures(context.getTargetMetric()); 050 for (Measure measure : measures) { 051 if (MeasureUtils.hasValue(measure)) { 052 sum+=measure.getValue(); 053 count++; 054 hasValue=true; 055 } 056 } 057 058 if (!hasValue && !forceZeroIfMissingData) { 059 return null; 060 } 061 return new Measure(context.getTargetMetric(), (count==0 ? 0.0 : sum/count)); 062 } 063}