Method partitionImpl

corpus/java/training/guava/collect/Iterators.java:576–605

(
      final Iterator<T> iterator, final int size, final boolean pad)

  }

  private static <T> UnmodifiableIterator<List<T>> partitionImpl(
      final Iterator<T> iterator, final int size, final boolean pad) {
    checkNotNull(iterator);
    checkArgument(size > 0);
    return new UnmodifiableIterator<List<T>>() {
      @Override
      public boolean hasNext() {
        return iterator.hasNext();
      }

      @Override
      public List<T> next() {
        if (!hasNext()) {
          throw new NoSuchElementException();
        }
        Object[] array = new Object[size];
        int count = 0;
        for (; count < size && iterator.hasNext(); count++) {
          array[count] = iterator.next();
        }
        for (int i = count; i < size; i++) {
          array[i] = null; // for GWT
        }

        @SuppressWarnings("unchecked") // we only put Ts in it
        List<T> list = Collections.unmodifiableList((List<T>) Arrays.asList(array));
        return (pad || count == size) ? list : list.subList(0, count);
      }
    };
  }

  /**
   * Returns a view of {@code unfiltered} containing all elements that satisfy