private Set<String> collectURIs(DataSource source) {
Set<String> result = new HashSet<>();
switch (type) {
case File:
for (File file : source.getFiles()) result.add(file.getUri());
break;
case Map:
for (Map map : source.getMaps()) result.add(map.getUri());
break;
case Theme:
for (Theme theme : source.getThemes()) result.add(theme.getUri());
break;
}
return result;
}
