* 最初の要素を返します。
     *
     * @return 最初の要素
     */
    public E getFirst() {
        if (isEmpty()) {
            throw new NoSuchElementException();
        }
        return getFirstEntry().element;
    }

    /**
     * 最後の要素を返します。
     *
     * @return 最後の要素
     */
    public E getLast() {
        if (isEmpty()) {
            throw new NoSuchElementException();
        }

            } else {
                if (assertionError) {
                    placeholder = new PlaceholderAssertionError(type, message, getMessageExec, toString, toStringRuntimeExec, causes.isEmpty() ? null : causes.get(0));
                } else {

  public void testIsEmpty() {
    assertThat(ImmutableDoubleArray.of().isEmpty()).isTrue();
    assertThat(ImmutableDoubleArray.of(0).isEmpty()).isFalse();
    assertThat(ImmutableDoubleArray.of(0, 1, 3).isEmpty()).isFalse();
    assertThat(ImmutableDoubleArray.of(0, 1, 3).subArray(1, 1).isEmpty()).isTrue();
    assertThat(ImmutableDoubleArray.of(0, 1, 3).subArray(1, 2).isEmpty()).isFalse();
  }

  public void testGet_good() {

                if (resultsPerPage instanceof Integer) {
                    form.num = (Integer) resultsPerPage;
                }
            }
        }

        if (StringUtil.isBlank(form.q) && form.fields.isEmpty() && !form.hasConditionQuery()) {
            // redirect to index page
            form.q = null;
            return redirectToRoot();
        }

        try {
            buildFormParams(form);

            Set<ModuleComponentIdentifier> componentIdentifiers = getModuleComponentIdentifiers();
            if (componentIdentifiers.isEmpty()) {
                return;
            }

            List<Class<? extends Artifact>> types = getAuxiliaryArtifactTypes(visitor);
            if (types.isEmpty()) {
                return;
            }

        if (repo != null) {
            String id = repo.getId();

            if (id == null || id.isEmpty()) {
                throw new InvalidRepositoryException("Repository identifier missing", "");
            }

            String url = repo.getUrl();

            if (url == null || url.isEmpty()) {
                throw new InvalidRepositoryException("URL missing for repository " + id, id);
            }

        for (ResourcePattern pattern : filteredPatterns) {
            visit(pattern, versionListPatterns, collector, result);
        }
        if (!collector.isEmpty()) {
            result.listed(collector);
        }
    }

    private List<ResourcePattern> filterDuplicates(List<ResourcePattern> patterns) {
        if (patterns.size() <= 1) {
            return patterns;

    @Override
    protected SortedSet<Integer> create(Integer[] elements) {
      SortedSet<Integer> set = nullCheckedTreeSet(elements);
      int tooHigh = set.isEmpty() ? 0 : set.last() + 1;
      set.add(tooHigh);
      return checkedCreate(set).headSet(tooHigh);
    }
  }

  public static class ContiguousSetTailsetGenerator extends AbstractContiguousSetGenerator {

        if (!variant.getDependencyConstraints().isEmpty()) {
            for (DependencyConstraint constraint : variant.getDependencyConstraints()) {
                warnings.addUnsupported(String.format("%s:%s:%s declared as a dependency constraint", constraint.getGroup(), constraint.getName(), constraint.getVersion()));
            }
        }
        if (!variant.getCapabilities().isEmpty()) {

                PluginContainer source,
                boolean sourceDominant,
                Map<Object, Object> context) {
            List<Plugin> src = source.getPlugins();
            if (!src.isEmpty()) {
                List<Plugin> tgt = target.getPlugins();
                Map<Object, Plugin> master = new LinkedHashMap<>(tgt.size() * 2);

                for (Plugin element : tgt) {