Class CollectionUtil

src/main/java/com/oltpbenchmark/util/CollectionUtil.java:26–180

@author pavlo

 * @author pavlo
 */
public abstract class CollectionUtil {

  /**
   * Put all the values of an Iterator into a List
   *
   * @param <T>
   * @param it
   * @return
   */
  public static <T> List<T> list(Iterator<T> it) {
    List<T> list = new ArrayList<>();
    CollectionUtil.addAll(list, it);
    return (list);
  }

  /**
   * Add all the items in the array to a Collection
   *
   * @param <T>
   * @param data
   * @param items
   */
  @SuppressWarnings("unchecked")
  public static <T> Collection<T> addAll(Collection<T> data, T... items) {
    data.addAll(Arrays.asList(items));
    return (data);
  }

  /**
   * Add all of the items from the Iterator into the given collection
   *
   * @param <T>
   * @param data
   * @param items
   */
  public static <T> Collection<T> addAll(Collection<T> data, Iterator<T> items) {
    while (items.hasNext()) {
      data.add(items.next());
    }
    return (data);
  }

  /**
   * @param <T>
   * @param <U>
   * @param map
   * @return
   */
  public static <T, U extends Comparable<U>> T getGreatest(Map<T, U> map) {
    T max_key = null;
    U max_value = null;
    for (Map.Entry<T, U> e : map.entrySet()) {
      T key = e.getKey();
      U value = e.getValue();
      if (max_value == null || value.compareTo(max_value) > 0) {
        max_value = value;
        max_key = key;
      }