001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
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.batch.components;
021    
022    import org.apache.commons.lang.time.DateUtils;
023    import org.sonar.api.BatchExtension;
024    import org.sonar.api.CoreProperties;
025    import org.sonar.api.database.DatabaseSession;
026    import org.sonar.api.database.model.Snapshot;
027    import org.sonar.api.resources.Qualifiers;
028    
029    import java.util.Date;
030    import java.util.List;
031    
032    public class PastSnapshotFinderByDays implements BatchExtension {
033    
034      private DatabaseSession session;
035    
036      public PastSnapshotFinderByDays(DatabaseSession session) {
037        this.session = session;
038      }
039    
040      PastSnapshot findFromDays(Snapshot projectSnapshot, int days) {
041        Date targetDate = DateUtils.addDays(projectSnapshot.getCreatedAt(), -days);
042        String hql = "from " + Snapshot.class.getSimpleName() + " where resourceId=:resourceId AND status=:status AND createdAt<:date AND qualifier<>:lib order by createdAt asc";
043        List<Snapshot> snapshots = session.createQuery(hql)
044            .setParameter("date", projectSnapshot.getCreatedAt())
045            .setParameter("resourceId", projectSnapshot.getResourceId())
046            .setParameter("status", Snapshot.STATUS_PROCESSED)
047            .setParameter("lib", Qualifiers.LIBRARY)
048            .getResultList();
049    
050        Snapshot snapshot = getNearestToTarget(snapshots, targetDate);
051        return new PastSnapshot(CoreProperties.TIMEMACHINE_MODE_DAYS, targetDate, snapshot).setModeParameter(String.valueOf(days));
052      }
053    
054      static Snapshot getNearestToTarget(List<Snapshot> snapshots, Date currentDate, int distanceInDays) {
055        Date targetDate = DateUtils.addDays(currentDate, -distanceInDays);
056        return getNearestToTarget(snapshots, targetDate);
057      }
058    
059      static Snapshot getNearestToTarget(List<Snapshot> snapshots, Date targetDate) {
060        long bestDistance = Long.MAX_VALUE;
061        Snapshot nearest = null;
062        for (Snapshot snapshot : snapshots) {
063          long distance = distance(snapshot.getCreatedAt(), targetDate);
064          if (distance <= bestDistance) {
065            bestDistance = distance;
066            nearest = snapshot;
067          }
068        }
069        return nearest;
070      }
071    
072      static long distance(Date d1, Date d2) {
073        return Math.abs(d1.getTime() - d2.getTime());
074      }
075    }