Filter params to JooQ Condition - Java 8+

OfferSearchConditionFactory.java

public class OfferSearchConditionFactory {

  public static Collection<Condition> create(OfferSearchFilter searchFilter) {
    List<Condition> conditions = Lists.newArrayList();

    Optional<OfferSearchFilter> filter = Optional.of(searchFilter);

    filter
            .map(OfferSearchFilter::getUserId)
            .map(USER.USER_ID::eq)
            .ifPresent(conditions::add);

    filter
            .map(OfferSearchFilter::getEndPrice)
            .map(BigDecimal::valueOf)
            .map(OFFER.PRICE::lessOrEqual)
            .ifPresent(conditions::add);

    filter
            .map(OfferSearchFilter::getStartPrice)
            .map(BigDecimal::valueOf)
            .map(OFFER.PRICE::greaterOrEqual)
            .ifPresent(conditions::add);

    filter
            .map(OfferSearchFilter::getMaxPerGroup)
            .map(OFFER.MAX_PER_GROUP::lessOrEqual)
            .ifPresent(conditions::add);

    return conditions;
  }
}