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.batch.components;
021    
022    import org.sonar.api.BatchExtension;
023    import org.sonar.api.CoreProperties;
024    import org.sonar.api.batch.Event;
025    import org.sonar.api.database.DatabaseSession;
026    import org.sonar.api.database.model.Snapshot;
027    
028    import java.util.List;
029    
030    public class PastSnapshotFinderByPreviousVersion implements BatchExtension {
031    
032      private final DatabaseSession session;
033    
034      public PastSnapshotFinderByPreviousVersion(DatabaseSession session) {
035        this.session = session;
036      }
037    
038      PastSnapshot findByPreviousVersion(Snapshot projectSnapshot) {
039        String currentVersion = projectSnapshot.getVersion();
040        Integer resourceId = projectSnapshot.getResourceId();
041    
042        String hql = "from " + Event.class.getSimpleName() +
043          " where name<>:version AND category='Version' AND resourceId=:resourceId ORDER BY date DESC";
044    
045        List<Event> events = session.createQuery(hql)
046            .setParameter("version", currentVersion)
047            .setParameter("resourceId", resourceId)
048            .setMaxResults(1)
049            .getResultList();
050    
051        if (events.isEmpty()) {
052          return new PastSnapshot(CoreProperties.TIMEMACHINE_MODE_PREVIOUS_VERSION);
053        }
054    
055        Event previousVersionEvent = events.get(0);
056        Snapshot snapshot = session.getSingleResult(Snapshot.class, "id", previousVersionEvent.getSnapshot().getId());
057    
058        return new PastSnapshot(CoreProperties.TIMEMACHINE_MODE_PREVIOUS_VERSION, snapshot.getCreatedAt(), snapshot).setModeParameter(snapshot.getVersion());
059      }
060    
061    }