plugin,
                                pluginFile.getAbsolutePath());
                    }
                }
            } else {
                File pluginXml = new File(pluginFile, getPluginDescriptorLocation());

                if (pluginXml.isFile()) {
                    pluginDescriptor = parsePluginDescriptor(

        if (!hasBeenPackagedDuringThisSession(project)) {
            // fallback to loose class files only if artifacts haven't been packaged yet
            // and only for plain old jars. Not war files, not ear files, not anything else.
            return determineBuildOutputDirectoryForArtifact(project, artifact);
        }

        // The fall-through indicates that the artifact cannot be found;

            projectPrefixValueSource = new PrefixedObjectValueSource(PROJECT_PREFIXES_4_0, model, false);
            prefixlessObjectBasedValueSource = new ObjectBasedValueSource(model);
        } else {
            projectPrefixValueSource = new PrefixedObjectValueSource(PROJECT_PREFIXES_3_1, model, false);
            if (request.getValidationLevel() >= ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_2_0) {

    private static String[] determinePsCommand() {
        if (isWindows()) {
            return new String[]{"wmic", "process", "get", "processid,commandline"};
        } else if (isMacOS()) {
            return new String[]{"ps", "x", "-o", "pid,command"};
        } else {
            return new String[]{"ps", "x", "-o", "pid,cmd"};
        }
    }

    private static boolean isWindows() {

      long nanos = unit.toNanos(timeout);
      synchronized (lock) {
        while (true) {
          if (shutdown && runningTasks == 0) {
            return true;
          } else if (nanos <= 0) {
            return false;
          } else {
            long now = System.nanoTime();
            TimeUnit.NANOSECONDS.timedWait(lock, nanos);
            nanos -= System.nanoTime() - now; // subtract the actual time we waited

        if (Artifact.SCOPE_PROVIDED.equals(expectedScope)) {
            filter = new ScopeArtifactFilter(Artifact.SCOPE_COMPILE);
        } else if (Artifact.SCOPE_SYSTEM.equals(expectedScope)) {
            filter = new ScopeArtifactFilter(Artifact.SCOPE_COMPILE);
        } else {
            filter = new ScopeArtifactFilter(expectedScope);
        }

      RegularImmutableSortedSet<E> result =
          (RegularImmutableSortedSet<E>) RegularImmutableSortedSet.NATURAL_EMPTY_SET;
      return result;
    } else {
      return new RegularImmutableSortedSet<>(ImmutableList.of(), comparator);
    }
  }

  /**
   * Returns the empty immutable sorted set.
   *

        assertArgumentNotNull("handler", handler);

        if (jarFile.getName().toLowerCase().endsWith(WAR_FILE_EXTENSION)) {
            forEach(jarFile, WEB_INF_CLASSES_PATH, handler);
        } else {
            forEach(jarFile, "", handler);
        }
    }

    /**
     * Jarファイルに含まれるクラスをトラバースします。
     * <p>
     * Jarファイル内のエントリのうち、接頭辞で始まるパスを持つエントリがトラバースの対象となります。

    if (table instanceof ImmutableTable) {
      @SuppressWarnings("unchecked")
      ImmutableTable<R, C, V> parameterizedTable = (ImmutableTable<R, C, V>) table;
      return parameterizedTable;
    } else {
      return copyOf(table.cellSet());
    }
  }

  static <R, C, V> ImmutableTable<R, C, V> copyOf(
      Iterable<? extends Cell<? extends R, ? extends C, ? extends V>> cells) {

                    descriptors = Collections.unmodifiableMap(names);
                    isModuleHierarchy = true;
                    return;
                }
            }
        } else if (Files.isRegularFile(path)) {
            /*
             * JAR file: can contain only one module, with descriptor at the root.
             * If no descriptor, the "Automatic-Module-Name" manifest attribute is