buildSrc/src/main/java/com/uber/okbuck/core/dependency/OExternalDependency.java [26:260]:
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public class OExternalDependency {
  private static final String SOURCE_FILE = "-sources.jar";

  private final OResolvedDependency base;
  private final Path cachePath;

  private boolean enableJetifier;
  private Set<OExternalDependency> dependencies = new HashSet<>();
  private Set<ExcludeRule> excludeRules = new HashSet<>();

  private boolean firstLevel = false;

  public static Comparator<OExternalDependency> compareByName =
      (o1, o2) ->
          ComparisonChain.start()
              .compare(o1.getTargetPath(), o2.getTargetPath())
              .compare(o1.getPackaging(), o2.getPackaging())
              .compare(o1.getTargetName(), o2.getTargetName())
              .result();

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof OExternalDependency)) {
      return false;
    }
    OExternalDependency that = (OExternalDependency) o;
    return Objects.equals(base, that.base);
  }

  /**
   * Return the maven coordinates used for version validation. This excludes the classifier and
   * packaging attributes
   */
  public String getMavenCoordsForValidation() {
    return base.getMavenCoordsForValidation();
  }

  @Override
  public int hashCode() {
    return this.base.hashCode();
  }

  @Override
  public String toString() {
    return this.base.toString();
  }

  /** Returns the group of the dependency. */
  public String getGroup() {
    return getVersionless().group();
  }

  /** Returns the name of the dependency. */
  public String getName() {
    return getVersionless().name();
  }

  /** Returns the VersionlessDependency of the dependency. */
  public VersionlessDependency getVersionless() {
    return this.base.versionless();
  }

  /** Returns the dependency as a Gradle Dependency. */
  public Dependency getAsGradleDependency() {
    return this.base.asGradleDependency();
  }

  /** Returns the version of the dependency. */
  public String getVersion() {
    return this.base.version();
  }

  /** Returns the real artifact file of the dependency. */
  public File getRealDependencyFile() {
    return this.base.realDependencyFile();
  }

  /** Gets the real sources jar file for the dependency. */
  public Optional<File> getRealSourceFile() {
    // Doesn't support sources for artifacts with classifier
    if (this.base.versionless().classifier().isPresent()) {
      return Optional.empty();
    } else {
      return this.base.realDependencySourceFile();
    }
  }

  public static String getGradleSha(File file) {
    return file.getParentFile().getName();
  }

  /** Returns the packaging of the the dependency: jar, aar, pex */
  public String getPackaging() {
    return this.base.packaging();
  }

  /** Returns the maven coordinates of the the dependency. */
  public String getMavenCoords() {
    return this.base.getMavenCoords();
  }

  /** Returns the target name of the dependency. */
  public String getTargetName() {
    return this.base.targetName() + "." + getPackaging();
  }

  /** Returns the target name of the dependency without packaging. */
  public String getBaseTargetName() {
    return this.base.targetName();
  }

  /** Returns the versionless target name of the dependency. */
  public String getVersionlessTargetName() {
    return this.base.versionlessTargetName() + "." + getPackaging();
  }

  /** Returns the target path of the dependency. */
  public String getTargetPath() {
    return cachePath.resolve(this.base.basePath()).toString();
  }

  /** Returns the cached file name of the sources jar file. */
  public String getSourceFileName() {
    return getSourceFileNameFrom(getDependencyFileName());
  }

  /** Returns the cached file name of the artifact of the dependency. */
  public String getDependencyFileName() {
    return getTargetName();
  }

  /** Returns true if this dependency needs to be jetified. */
  public boolean enableJetifier() {
    return enableJetifier;
  }

  public synchronized void addExcludeRules(Set<ExcludeRule> excludeRules) {
    this.excludeRules.addAll(excludeRules);
  }

  public synchronized void addDeps(Set<OExternalDependency> dependencies) {
    this.dependencies.addAll(dependencies);
  }

  public Set<OExternalDependency> getDeps() {
    return dependencies
        .stream()
        .collect(Collectors.groupingBy(OExternalDependency::getVersionless))
        .values()
        .stream()
        .map(
            deps -> {
              Optional<OExternalDependency> matching =
                  deps.stream()
                      .filter(
                          d -> {
                            // If the child's group and version matches with parent
                            // prefer that children. Don't judge.
                            if (d.getGroup().equals(this.getGroup())) {
                              return d.getVersion().equals(this.getVersion());
                            }
                            return false;
                          })
                      .findAny();
              return matching.orElseGet(() -> DependencyUtils.lowest(deps));
            })
        .filter(this::shouldInclude)
        .collect(Collectors.toSet());
  }

  public void updateFirstLevel(boolean firstLevel) {
    this.firstLevel = this.firstLevel || firstLevel;
  }

  public boolean isFirstLevel() {
    return this.firstLevel;
  }

  String getSourceFileNameFrom(String prebuiltName) {
    if (ImmutableList.of(JAR, AAR).contains(getPackaging())) {
      return prebuiltName.replaceFirst("\\.(jar|aar)$", SOURCE_FILE);
    }
    throw new IllegalStateException("Couldn't get sources file name for " + prebuiltName);
  }

  private boolean shouldInclude(OExternalDependency dependency) {
    for (ExcludeRule rule : excludeRules) {
      if (rule.getGroup() != null && rule.getModule() != null) {
        if (dependency.getGroup().equals(rule.getGroup())
            && dependency.getName().equals(rule.getModule())) {
          return false;
        } else {
          return true;
        }
      } else {
        if (dependency.getGroup().equals(rule.getGroup())) {
          return false;
        }
        if (dependency.getName().equals(rule.getModule())) {
          return false;
        }
      }
    }
    return true;
  }

  protected OExternalDependency(
      OResolvedDependency resolvedDependency,
      ExternalDependenciesExtension externalDependenciesExtension,
      JetifierExtension jetifierExtension) {

    this.base = resolvedDependency;
    this.enableJetifier =
        jetifierExtension.shouldJetify(
            resolvedDependency.versionless().group(),
            resolvedDependency.versionless().name(),
            getPackaging());
    this.cachePath = Paths.get(externalDependenciesExtension.getCache());
  }

  public static Set<OExternalDependency> filterAar(Set<OExternalDependency> dependencies) {
    return dependencies
        .stream()
        .filter(dependency -> dependency.getPackaging().equals(AAR))
        .collect(Collectors.toSet());
  }

  public static Set<OExternalDependency> filterJar(Set<OExternalDependency> dependencies) {
    return dependencies
        .stream()
        .filter(dependency -> dependency.getPackaging().equals(JAR))
        .collect(Collectors.toSet());
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plugin/src/main/java/com/uber/okbuck/core/dependency/OExternalDependency.java [26:260]:
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public class OExternalDependency {
  private static final String SOURCE_FILE = "-sources.jar";

  private final OResolvedDependency base;
  private final Path cachePath;

  private boolean enableJetifier;
  private Set<OExternalDependency> dependencies = new HashSet<>();
  private Set<ExcludeRule> excludeRules = new HashSet<>();

  private boolean firstLevel = false;

  public static Comparator<OExternalDependency> compareByName =
      (o1, o2) ->
          ComparisonChain.start()
              .compare(o1.getTargetPath(), o2.getTargetPath())
              .compare(o1.getPackaging(), o2.getPackaging())
              .compare(o1.getTargetName(), o2.getTargetName())
              .result();

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof OExternalDependency)) {
      return false;
    }
    OExternalDependency that = (OExternalDependency) o;
    return Objects.equals(base, that.base);
  }

  /**
   * Return the maven coordinates used for version validation. This excludes the classifier and
   * packaging attributes
   */
  public String getMavenCoordsForValidation() {
    return base.getMavenCoordsForValidation();
  }

  @Override
  public int hashCode() {
    return this.base.hashCode();
  }

  @Override
  public String toString() {
    return this.base.toString();
  }

  /** Returns the group of the dependency. */
  public String getGroup() {
    return getVersionless().group();
  }

  /** Returns the name of the dependency. */
  public String getName() {
    return getVersionless().name();
  }

  /** Returns the VersionlessDependency of the dependency. */
  public VersionlessDependency getVersionless() {
    return this.base.versionless();
  }

  /** Returns the dependency as a Gradle Dependency. */
  public Dependency getAsGradleDependency() {
    return this.base.asGradleDependency();
  }

  /** Returns the version of the dependency. */
  public String getVersion() {
    return this.base.version();
  }

  /** Returns the real artifact file of the dependency. */
  public File getRealDependencyFile() {
    return this.base.realDependencyFile();
  }

  /** Gets the real sources jar file for the dependency. */
  public Optional<File> getRealSourceFile() {
    // Doesn't support sources for artifacts with classifier
    if (this.base.versionless().classifier().isPresent()) {
      return Optional.empty();
    } else {
      return this.base.realDependencySourceFile();
    }
  }

  public static String getGradleSha(File file) {
    return file.getParentFile().getName();
  }

  /** Returns the packaging of the the dependency: jar, aar, pex */
  public String getPackaging() {
    return this.base.packaging();
  }

  /** Returns the maven coordinates of the the dependency. */
  public String getMavenCoords() {
    return this.base.getMavenCoords();
  }

  /** Returns the target name of the dependency. */
  public String getTargetName() {
    return this.base.targetName() + "." + getPackaging();
  }

  /** Returns the target name of the dependency without packaging. */
  public String getBaseTargetName() {
    return this.base.targetName();
  }

  /** Returns the versionless target name of the dependency. */
  public String getVersionlessTargetName() {
    return this.base.versionlessTargetName() + "." + getPackaging();
  }

  /** Returns the target path of the dependency. */
  public String getTargetPath() {
    return cachePath.resolve(this.base.basePath()).toString();
  }

  /** Returns the cached file name of the sources jar file. */
  public String getSourceFileName() {
    return getSourceFileNameFrom(getDependencyFileName());
  }

  /** Returns the cached file name of the artifact of the dependency. */
  public String getDependencyFileName() {
    return getTargetName();
  }

  /** Returns true if this dependency needs to be jetified. */
  public boolean enableJetifier() {
    return enableJetifier;
  }

  public synchronized void addExcludeRules(Set<ExcludeRule> excludeRules) {
    this.excludeRules.addAll(excludeRules);
  }

  public synchronized void addDeps(Set<OExternalDependency> dependencies) {
    this.dependencies.addAll(dependencies);
  }

  public Set<OExternalDependency> getDeps() {
    return dependencies
        .stream()
        .collect(Collectors.groupingBy(OExternalDependency::getVersionless))
        .values()
        .stream()
        .map(
            deps -> {
              Optional<OExternalDependency> matching =
                  deps.stream()
                      .filter(
                          d -> {
                            // If the child's group and version matches with parent
                            // prefer that children. Don't judge.
                            if (d.getGroup().equals(this.getGroup())) {
                              return d.getVersion().equals(this.getVersion());
                            }
                            return false;
                          })
                      .findAny();
              return matching.orElseGet(() -> DependencyUtils.lowest(deps));
            })
        .filter(this::shouldInclude)
        .collect(Collectors.toSet());
  }

  public void updateFirstLevel(boolean firstLevel) {
    this.firstLevel = this.firstLevel || firstLevel;
  }

  public boolean isFirstLevel() {
    return this.firstLevel;
  }

  String getSourceFileNameFrom(String prebuiltName) {
    if (ImmutableList.of(JAR, AAR).contains(getPackaging())) {
      return prebuiltName.replaceFirst("\\.(jar|aar)$", SOURCE_FILE);
    }
    throw new IllegalStateException("Couldn't get sources file name for " + prebuiltName);
  }

  private boolean shouldInclude(OExternalDependency dependency) {
    for (ExcludeRule rule : excludeRules) {
      if (rule.getGroup() != null && rule.getModule() != null) {
        if (dependency.getGroup().equals(rule.getGroup())
            && dependency.getName().equals(rule.getModule())) {
          return false;
        } else {
          return true;
        }
      } else {
        if (dependency.getGroup().equals(rule.getGroup())) {
          return false;
        }
        if (dependency.getName().equals(rule.getModule())) {
          return false;
        }
      }
    }
    return true;
  }

  protected OExternalDependency(
      OResolvedDependency resolvedDependency,
      ExternalDependenciesExtension externalDependenciesExtension,
      JetifierExtension jetifierExtension) {

    this.base = resolvedDependency;
    this.enableJetifier =
        jetifierExtension.shouldJetify(
            resolvedDependency.versionless().group(),
            resolvedDependency.versionless().name(),
            getPackaging());
    this.cachePath = Paths.get(externalDependenciesExtension.getCache());
  }

  public static Set<OExternalDependency> filterAar(Set<OExternalDependency> dependencies) {
    return dependencies
        .stream()
        .filter(dependency -> dependency.getPackaging().equals(AAR))
        .collect(Collectors.toSet());
  }

  public static Set<OExternalDependency> filterJar(Set<OExternalDependency> dependencies) {
    return dependencies
        .stream()
        .filter(dependency -> dependency.getPackaging().equals(JAR))
        .collect(Collectors.toSet());
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