import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * The annotated element must not be null.
 * <p>
 * Annotated fields must not be null after construction has completed.
 * <p>
 * When this annotation is applied to a method it applies to the method return value.
 *
 * @see Nullable
 * @since 4.0.0
 */
@Experimental

    /**
     * Builds the effective toolchains of the specified toolchains files.
     *
     * @param request The toolchains building request that holds the parameters, must not be {@code null}.
     * @return The result of the toolchains building, never {@code null}.
     * @throws ToolchainsBuildingException If the effective toolchains could not be built.
     */

     */
    void build(ClassDoc classDoc) {
        ClassMetaData classMetaData = classDoc.getClassMetaData();
        String superClassName = classMetaData.getSuperClassName();
        if (superClassName != null) {
            // Assume this is a class and so has implemented all properties and methods somewhere in the superclass hierarchy
            ClassDoc superClass = model.getClassDoc(superClassName);

      ExecutionException ee = null;
      long lastTime = timed ? System.nanoTime() : 0;
      Iterator<? extends Callable<T>> it = tasks.iterator();

      futures.add(submitAndAddQueueListener(executorService, it.next(), futureQueue));
      --ntasks;
      int active = 1;

      while (true) {
        Future<T> f = futureQueue.poll();
        if (f == null) {
          if (ntasks > 0) {

        if ( a.atLeast(b) ) {
            return a;
        }
        return b;
    }


    /**
     * @param min
     *            may be null for open end
     * @param max
     *            may be null for open end
     * @return range of versions
     */
    public static Set<DialectVersion> range ( DialectVersion min, DialectVersion max ) {

  public void testCount_nullAbsent() {
    assertEquals("multiset.count(null) didn't return 0", 0, getMultiset().count(null));
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
  public void testCount_null_forbidden() {
    assertThrows(NullPointerException.class, () -> getMultiset().count(null));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)

        return complete(v, null, COMPLETED);
      }

      /** Transition to the COMPLETED state and set the exception. */
      boolean setException(Throwable t) {
        return complete(null, t, COMPLETED);
      }

      /** Transition to the CANCELLED or INTERRUPTED state. */
      boolean cancel(boolean interrupt) {
        return complete(null, null, interrupt ? INTERRUPTED : CANCELLED);
      }

        labelTypeBhv.delete(labelType, op -> {
            op.setRefreshPolicy(Constants.TRUE);
        });

        final LabelTypeHelper labelTypeHelper = ComponentUtil.getLabelTypeHelper();
        if (labelTypeHelper != null) {
            labelTypeHelper.refresh(getLabelTypeList());
        }
    }

    protected void setupListCondition(final LabelTypeCB cb, final LabelTypePager labelTypePager) {

     *            イテレートする要素の並び。{@literal null}であってはいけません
     * @return 配列をラップした{@link Iterable}
     */
    public static <T> Iterable<T> iterable(final T... items) {
        assertArgumentNotNull("items", items);

        return () -> new ArrayIterator<>(items);
    }

    /**
     * {@link ArrayIterator}を作成します。
     *
     * @param items
     *            イテレートする要素の並び。{@literal null}であってはいけません
     */

            throws ArtifactMetadataRetrievalException {
        Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);
            } catch (Exception e) {