Method retainAll

src/main/java/groovy/util/ObservableSet.java:355–380

{@inheritDoc}

(Collection<?> c)

    /** {@inheritDoc} */
    @Override
    public boolean retainAll(Collection<?> c) {
        if (c == null) {
            return false;
        }

        List values = new ArrayList();
        // GROOVY-7822 use Set for O(1) performance for contains
        if (!(c instanceof Set)) {
            c = new HashSet<Object>(c);
        }
        for (Object element : delegate) {
            if (!c.contains(element)) {
                values.add(element);
            }
        }

        int oldSize = size();
        boolean success = delegate.retainAll(c);
        if (success && !values.isEmpty()) {
            fireMultiElementRemovedEvent(values);
            fireSizeChangedEvent(oldSize, size());
        }

        return success;
    }

    /** {@inheritDoc} */
    @Override