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 */
020package org.sonar.plugins.jacoco;
021
022import org.apache.commons.io.FileUtils;
023import org.jacoco.agent.AgentJar;
024import org.jacoco.core.JaCoCo;
025import org.sonar.api.BatchExtension;
026import org.sonar.api.utils.SonarException;
027
028import java.io.File;
029import java.io.IOException;
030
031/**
032 * @author Evgeny Mandrikov
033 */
034public 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}