Method filter

output/java_guava/1.4.18/Iterators.java:643–658

Returns a view of unfiltered containing all elements that satisfy the input predicate retainIfTrue.

(final Iterator<T> unfiltered, final Predicate<? super T> retainIfTrue)

  public static <T> UnmodifiableIterator<T> filter(final Iterator<T> unfiltered, final Predicate<? super T> retainIfTrue) {
    checkNotNull(unfiltered);
    checkNotNull(retainIfTrue);
    return new AbstractIterator<T>() {
      @Override
      protected T computeNext() {
        while (unfiltered.hasNext()) {
          T element = unfiltered.next();
          if (retainIfTrue.apply(element)) {
            return element;
          }
        }
        return endOfData();
      }
    };
  }

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