}
private Iterator enumeratePrefixes(Collection prefixes,
final DashHierarchy hier) {
Iterator iter = PropertyKeyIterator.getForPrefixes(hier, prefixes);
Iterator result = new IteratorFilter(iter) {
{ init(); }
protected boolean includeInResults(Object o) {
PropertyKey key = (PropertyKey) o;
return StringUtils.hasValue(hier.pget(key).getDataFile());
}};