001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar 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     * Sonar 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
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.api.measures;
021    
022    import java.util.List;
023    import java.util.Collections;
024    import java.util.Collection;
025    
026    /**
027     * @since 2.0
028     *
029     * Used to consolidate a distribution measure throughout the resource tree
030     */
031    public class SumChildDistributionFormula implements Formula {
032    
033      public List<Metric> dependsUponMetrics() {
034        return Collections.emptyList();
035      }
036    
037      public Measure calculate(FormulaData data, FormulaContext context) {
038        Collection<Measure> measures = data.getChildrenMeasures(context.getTargetMetric());
039        if (measures == null || measures.isEmpty()) {
040          return null;
041        }
042        else {
043          RangeDistributionBuilder distribution = new RangeDistributionBuilder(context.getTargetMetric());
044          for (Measure measure : measures) {
045            distribution.add(measure);
046          }
047          return distribution.build();
048        }
049      }
050    }