public final class BuilderUtils {

private BuilderUtils () {
throw new UnsupportedOperationException("do not call")
}

public static <B> List<B> convertBuilderList(List<? extends ModelBuilder<B>> toConvert) {
            if (CollectionUtils.isEmpty(toConvert)) {
                return Collections.emptyList();
            }

            final List<B> results = new ArrayList<B>(toConvert.size());
            for (ModelBuilder<B> elem : toConvert) {
                if (elem != null) {
                    results.add(elem.build());
                }
            }
            return Collections.unmodifiableList(results);
        }

        public static <B> Collection<B> convertBuilderCollection(Collection<? extends ModelBuilder<B>> toConvert) {
            if (CollectionUtils.isEmpty(toConvert)) {
                return Collections.emptyList();
            }

            final Collection<B> results = new ArrayList<B>(toConvert.size());
            for (ModelBuilder<B> elem : toConvert) {
                if (elem != null) {
                    results.add(elem.build());
                }
            }
            return Collections.unmodifiableCollection(results);
        }

        public static <B> Set<B> convertBuilderSet(Collection<? extends ModelBuilder<B>> toConvert) {
            if (CollectionUtils.isEmpty(toConvert)) {
                return Collections.emptySet();
            }

            final Set<B> results = new HashSet<B>(toConvert.size());
            for (ModelBuilder<B> elem : toConvert) {
                if (elem != null) {
                    results.add(elem.build());
                }
            }
            return Collections.unmodifiableSet(results);
        }
    }