* {@link #create(Object...)}.
     */
    protected abstract List<Double> create(Double[] elements);

    @Override
    public Double[] createArray(int length) {
      return new Double[length];
    }

    /** Returns the original element list, unchanged. */
    @Override
    public List<Double> order(List<Double> insertionOrder) {
      return insertionOrder;
    }
  }

    RunnableExecutorPair reversedList = null;
    while (list != null) {
      RunnableExecutorPair tmp = list;
      list = list.next;
      tmp.next = reversedList;
      reversedList = tmp;
    }
    while (reversedList != null) {
      executeListener(reversedList.runnable, reversedList.executor);
      reversedList = reversedList.next;
    }
  }

  /**

        final List<String> list = new ArrayList<String>();
        traverser.forEach((ResourceHandler) (path, is) -> list.add(path));
        list.sort((s1, s2) -> s1.compareTo(s2));
        assertThat(list.size(), is(2));
        assertThat(list.get(0), is("junit/textui/ResultPrinter.class"));
        assertThat(list.get(1), is("junit/textui/TestRunner.class"));
    }

    /**

        final List<String> list = new ArrayList<>();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String key = fessConfig.getSystemProperty("saml.attribute.group.name", "memberOf");
        if (StringUtil.isNotBlank(key)) {
            final List<String> nameList = attributes.get(key);
            if (nameList != null) {
                list.addAll(nameList);
            }
        }

              }

              @Override
              public Iterable<E> order(List<E> insertionOrder) {
                List<E> list = new ArrayList<>();
                for (E e : delegate.order(insertionOrder)) {
                  list.add(e);
                }
                Collections.reverse(list);
                return list;
              }

              @Override

      }
    };
  }

  static <E extends @Nullable Object> List<E> castOrCopyToList(Iterable<E> iterable) {
    if (iterable instanceof List) {
      return (List<E>) iterable;
    }
    List<E> list = new ArrayList<>();
    for (E e : iterable) {
      list.add(e);
    }
    return list;
  }

  @SuppressWarnings("rawtypes") // https://github.com/google/guava/issues/989

import java.io.StringReader;
import java.util.List;

import org.junit.Test;

/**
 * @author wyukawa
 *
 */
public class IndexedIteratorTest {

    /**
     * @throws Exception
     */
    @Test
    public void test() throws Exception {
        final List<String> list = newArrayList();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");

        doc.put("key", array);

        List<String> result = DocumentUtil.getValue(doc, "key", List.class);
        assertEquals(Arrays.asList("a", "b", "c"), result);
    }

    public void test_first_element_from_list() {
        Map<String, Object> doc = new HashMap<>();
        List<String> list = Arrays.asList("first", "second", "third");
        doc.put("key", list);

    }

    // Mock classes

    static class MockRelatedContentBhv extends RelatedContentBhv {
        private List<RelatedContent> testData = new ArrayList<>();

        public void setTestData(List<RelatedContent> testData) {
            this.testData = testData;
        }

        public List<RelatedContent> getTestData() {
            return testData;
        }
    }

        converter1.init();
        converter2.init();

        String text = "test";
        String field = "content";

        List<String> readings1 = converter1.convert(text, field, "en");
        List<String> readings2 = converter2.convert(text, field, "ja");

        assertNotNull(readings1);
        assertNotNull(readings2);
        assertEquals("TEST", readings1.get(0));