public FilteredIterable retain()

in core/src/main/java/org/apache/commons/functor/core/collection/FilteredIterable.java [125:145]

• 17 lines of code
• 2 McCabe index (conditional complexity)

    public <U> FilteredIterable<U> retain(final Class<U> type) {
        if (type == null) {
            throw new NullPointerException("filtered type was null");
        }
        return new FilteredIterable<U>(new Iterable<U>() {

            public Iterator<U> iterator() {
                return TransformedIterator.transform(
                        FilteredIterator.filter(FilteredIterable.this.iterator(), IsInstance.of(type)),
                        new Function<T, U>() {

                            @SuppressWarnings("unchecked")
                            // this is okay because of the isinstance check
                            public U evaluate(T obj) {
                                return (U) obj;
                            }
                        });
            }

        });
    }