buildSrc/src/main/java/com/uber/okbuck/core/manager/JetifierManager.java [28:120]:
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public final class JetifierManager {

  private static final Logger LOG = LoggerFactory.getLogger(JetifierManager.class);

  private static final String JETIFIER_LOCATION = OkBuckGradlePlugin.WORKSPACE_PATH + "/jetifier";
  private static final String JETIFIER_DEPS_CONFIG = "okbuck_jetifier_deps";
  private static final String JETIFIER_GROUP = "com.android.tools.build.jetifier";
  private static final String JETIFIER_CLI_CLASS =
      "com.android.tools.build.jetifier.standalone.Main";
  private static final String JETIFIER_BINARY_RULE_NAME = "okbuck_jetifier";
  private static final String COMMONS_CLI_DEP = "commons-cli:commons-cli:1.3.1";

  private static final ImmutableList<String> JETIFIER_MODULES =
      ImmutableList.of("jetifier-core", "jetifier-processor");
  private static final ImmutableList<String> INTERNAL_MODULES =
      ImmutableList.of("jetifier-standalone.jar");

  @Nullable private Set<OExternalDependency> dependencies;
  private final Project project;
  private final BuckFileManager buckFileManager;

  public JetifierManager(Project project, BuckFileManager buckFileManager) {
    this.project = project;
    this.buckFileManager = buckFileManager;
  }

  public static boolean isJetifierEnabled(Project project) {
    Object prop = project.findProperty("android.enableJetifier");
    return prop != null ? Boolean.valueOf((String) prop) : false;
  }

  public void setupJetifier(String version) {
    if (!version.equals(JetifierExtension.DEFAULT_JETIFIER_VERSION)) {
      LOG.warn(
          "Using jetifier version other than %s; This might result in problems with the tool",
          JetifierExtension.DEFAULT_JETIFIER_VERSION);
    }

    Configuration jetifierConfig = project.getConfigurations().maybeCreate(JETIFIER_DEPS_CONFIG);
    DependencyHandler handler = project.getDependencies();
    JETIFIER_MODULES
        .stream()
        .map(module -> String.format("%s:%s:%s", JETIFIER_GROUP, module, version))
        .forEach(dependency -> handler.add(JETIFIER_DEPS_CONFIG, dependency));
    handler.add(JETIFIER_DEPS_CONFIG, COMMONS_CLI_DEP);

    dependencies =
        new DependencyCache(project, ProjectUtil.getDependencyManager(project))
            .build(jetifierConfig);
  }

  public void finalizeDependencies(OkBuckExtension okBuckExtension) {
    Path jetifierCache = project.file(JETIFIER_LOCATION).toPath();
    FileUtil.deleteQuietly(jetifierCache);

    if (dependencies != null && dependencies.size() > 0) {
      jetifierCache.toFile().mkdirs();

      ImmutableList.Builder<Rule> rulesBuilder = new ImmutableList.Builder<>();
      ImmutableSet.Builder<String> binaryDependencies = ImmutableSet.builder();
      binaryDependencies.addAll(BuckRuleComposer.external(dependencies));

      for (String module : INTERNAL_MODULES) {
        FileUtil.copyResourceToProject("jetifier/" + module, new File(jetifierCache.toFile(), module));
        rulesBuilder.add(
            new NativePrebuilt()
                .prebuiltType(RuleType.PREBUILT_JAR.getProperties().get(0))
                .prebuilt(module)
                .ruleType(RuleType.PREBUILT_JAR.getBuckName())
                .name(module));
        binaryDependencies.add(":" + module);
      }

      rulesBuilder.add(
          new JvmBinaryRule()
              .mainClassName(JETIFIER_CLI_CLASS)
              .deps(binaryDependencies.build())
              .ruleType(RuleType.JAVA_BINARY.getBuckName())
              .name(JETIFIER_BINARY_RULE_NAME)
              .defaultVisibility());

      if (okBuckExtension.getJetifierExtension().customConfigFile != null) {
        File configFile =
            project.file(Paths.get(okBuckExtension.getJetifierExtension().customConfigFile));

        String relativeConfigPath =
            FileUtil.getRelativePath(project.getRootProject().getProjectDir(), configFile);
        ProjectUtil.getPlugin(project.getRootProject()).exportedPaths.add(relativeConfigPath);
      }

      buckFileManager.writeToBuckFile(
          rulesBuilder.build(),
          project.getRootProject().file(JETIFIER_LOCATION + "/" + okBuckExtension.buildFileName));
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plugin/src/main/java/com/uber/okbuck/core/manager/JetifierManager.java [28:120]:
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public final class JetifierManager {

  private static final Logger LOG = LoggerFactory.getLogger(JetifierManager.class);

  private static final String JETIFIER_LOCATION = OkBuckGradlePlugin.WORKSPACE_PATH + "/jetifier";
  private static final String JETIFIER_DEPS_CONFIG = "okbuck_jetifier_deps";
  private static final String JETIFIER_GROUP = "com.android.tools.build.jetifier";
  private static final String JETIFIER_CLI_CLASS =
      "com.android.tools.build.jetifier.standalone.Main";
  private static final String JETIFIER_BINARY_RULE_NAME = "okbuck_jetifier";
  private static final String COMMONS_CLI_DEP = "commons-cli:commons-cli:1.3.1";

  private static final ImmutableList<String> JETIFIER_MODULES =
      ImmutableList.of("jetifier-core", "jetifier-processor");
  private static final ImmutableList<String> INTERNAL_MODULES =
      ImmutableList.of("jetifier-standalone.jar");

  @Nullable private Set<OExternalDependency> dependencies;
  private final Project project;
  private final BuckFileManager buckFileManager;

  public JetifierManager(Project project, BuckFileManager buckFileManager) {
    this.project = project;
    this.buckFileManager = buckFileManager;
  }

  public static boolean isJetifierEnabled(Project project) {
    Object prop = project.findProperty("android.enableJetifier");
    return prop != null ? Boolean.valueOf((String) prop) : false;
  }

  public void setupJetifier(String version) {
    if (!version.equals(JetifierExtension.DEFAULT_JETIFIER_VERSION)) {
      LOG.warn(
          "Using jetifier version other than %s; This might result in problems with the tool",
          JetifierExtension.DEFAULT_JETIFIER_VERSION);
    }

    Configuration jetifierConfig = project.getConfigurations().maybeCreate(JETIFIER_DEPS_CONFIG);
    DependencyHandler handler = project.getDependencies();
    JETIFIER_MODULES
        .stream()
        .map(module -> String.format("%s:%s:%s", JETIFIER_GROUP, module, version))
        .forEach(dependency -> handler.add(JETIFIER_DEPS_CONFIG, dependency));
    handler.add(JETIFIER_DEPS_CONFIG, COMMONS_CLI_DEP);

    dependencies =
        new DependencyCache(project, ProjectUtil.getDependencyManager(project))
            .build(jetifierConfig);
  }

  public void finalizeDependencies(OkBuckExtension okBuckExtension) {
    Path jetifierCache = project.file(JETIFIER_LOCATION).toPath();
    FileUtil.deleteQuietly(jetifierCache);

    if (dependencies != null && dependencies.size() > 0) {
      jetifierCache.toFile().mkdirs();

      ImmutableList.Builder<Rule> rulesBuilder = new ImmutableList.Builder<>();
      ImmutableSet.Builder<String> binaryDependencies = ImmutableSet.builder();
      binaryDependencies.addAll(BuckRuleComposer.external(dependencies));

      for (String module : INTERNAL_MODULES) {
        FileUtil.copyResourceToProject("jetifier/" + module, new File(jetifierCache.toFile(), module));
        rulesBuilder.add(
            new NativePrebuilt()
                .prebuiltType(RuleType.PREBUILT_JAR.getProperties().get(0))
                .prebuilt(module)
                .ruleType(RuleType.PREBUILT_JAR.getBuckName())
                .name(module));
        binaryDependencies.add(":" + module);
      }

      rulesBuilder.add(
          new JvmBinaryRule()
              .mainClassName(JETIFIER_CLI_CLASS)
              .deps(binaryDependencies.build())
              .ruleType(RuleType.JAVA_BINARY.getBuckName())
              .name(JETIFIER_BINARY_RULE_NAME)
              .defaultVisibility());

      if (okBuckExtension.getJetifierExtension().customConfigFile != null) {
        File configFile =
            project.file(Paths.get(okBuckExtension.getJetifierExtension().customConfigFile));

        String relativeConfigPath =
            FileUtil.getRelativePath(project.getRootProject().getProjectDir(), configFile);
        ProjectUtil.getPlugin(project.getRootProject()).exportedPaths.add(relativeConfigPath);
      }

      buckFileManager.writeToBuckFile(
          rulesBuilder.build(),
          project.getRootProject().file(JETIFIER_LOCATION + "/" + okBuckExtension.buildFileName));
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