001 /* 002 * SonarQube, open source software quality management tool. 003 * Copyright (C) 2008-2014 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 */ 020 package org.sonar.api.measures; 021 022 import java.util.Collection; 023 import java.util.Collections; 024 import java.util.List; 025 026 /** 027 * @since 2.0 028 */ 029 public 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 @Override 042 public List<Metric> dependsUponMetrics() { 043 return Collections.emptyList(); 044 } 045 046 @Override 047 public Measure calculate(FormulaData data, FormulaContext context) { 048 double sum=0.0; 049 int count=0; 050 boolean hasValue=false; 051 Collection<Measure> measures = data.getChildrenMeasures(context.getTargetMetric()); 052 for (Measure measure : measures) { 053 if (MeasureUtils.hasValue(measure)) { 054 sum+=measure.getValue(); 055 count++; 056 hasValue=true; 057 } 058 } 059 060 if (!hasValue && !forceZeroIfMissingData) { 061 return null; 062 } 063 return new Measure(context.getTargetMetric(), count==0 ? 0.0 : sum/count); 064 } 065 }