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.plugins.jacoco;
021    
022    import org.apache.commons.io.FileUtils;
023    import org.jacoco.agent.AgentJar;
024    import org.jacoco.core.JaCoCo;
025    import org.sonar.api.BatchExtension;
026    import org.sonar.api.utils.SonarException;
027    
028    import java.io.File;
029    import java.io.IOException;
030    
031    /**
032     * @author Evgeny Mandrikov
033     */
034    public class JaCoCoAgentDownloader implements BatchExtension {
035    
036      /**
037       * Dirty hack, but it allows to extract agent only once during Sonar analyzes for multi-module project.
038       */
039      private static File agentJarFile;
040    
041      public JaCoCoAgentDownloader() {
042      }
043    
044      public synchronized File getAgentJarFile() {
045        if (agentJarFile == null) {
046          agentJarFile = extractAgent();
047        }
048        return agentJarFile;
049      }
050    
051      private File extractAgent() {
052        try {
053          File agent = File.createTempFile("jacocoagent", ".jar");
054          AgentJar.extractTo(agent);
055          FileUtils.forceDeleteOnExit(agent); // TODO evil method
056          JaCoCoUtils.LOG.info("JaCoCo agent (version " + JaCoCo.VERSION + ") extracted: {}", agent);
057          return agent;
058        } catch (IOException e) {
059          throw new SonarException(e);
060        }
061      }
062    }