public boolean containsCustomRollUpMask(final CustomRollUpMask customRollUpMask) {
        if (customRollUpMasks != null) {
            return customRollUpMasks.contains(customRollUpMask);
        }
        return false;
    }
Held in a set to prevent duplicates.
<p>
XMLTransient to force JAXB to use the setter
stroom-core-shared/src/main/java/stroom/statistics/impl/sql/shared/StatisticsDataSourceData.java