protected DocSet computeDocSet(DocSet baseDocSet, List<String> excludeTagList)
throws SyntaxError, IOException {
Map<?, ?> tagMap = (Map<?, ?>) req.getContext().get("tags");
// rb can be null if facets are being calculated from a RequestHandler e.g. MoreLikeThisHandler
if (tagMap == null || rb == null) {
return baseDocSet;
}
IdentityHashMap<Query, Boolean> excludeSet = new IdentityHashMap<>();
for (String excludeTag : excludeTagList) {
Object olst = tagMap.get(excludeTag);
// tagMap has entries of List<String,List<QParser>>, but subject to change in the future
if (!(olst instanceof Collection)) continue;
for (Object o : (Collection<?>) olst) {
if (!(o instanceof QParser)) continue;
QParser qp = (QParser) o;
excludeSet.put(qp.getQuery(), Boolean.TRUE);
}
}
if (excludeSet.size() == 0) return baseDocSet;
List<Query> qlist = new ArrayList<>();
// add the base query
if (!excludeSet.containsKey(rb.getQuery())) {
qlist.add(rb.getQuery());
}
// add the filters
if (rb.getFilters() != null) {
for (Query q : rb.getFilters()) {
if (!excludeSet.containsKey(q)) {
qlist.add(q);
}
}
}
// get the new base docset for this facet
DocSet base = searcher.getDocSet(qlist);
if (rb.grouping() && rb.getGroupingSpec().isTruncateGroups()) {
Grouping grouping = new Grouping(searcher, null, rb.getQueryCommand(), false, 0, false);
grouping.setWithinGroupSort(rb.getGroupingSpec().getSortWithinGroup());
if (rb.getGroupingSpec().getFields().length > 0) {
grouping.addFieldCommand(rb.getGroupingSpec().getFields()[0], req);
} else if (rb.getGroupingSpec().getFunctions().length > 0) {
grouping.addFunctionCommand(rb.getGroupingSpec().getFunctions()[0], req);
} else {
return base;
}
AbstractAllGroupHeadsCollector allGroupHeadsCollector =
grouping.getCommands().get(0).createAllGroupCollector();
searcher.search(base.getTopFilter(), allGroupHeadsCollector);
return new BitDocSet(allGroupHeadsCollector.retrieveGroupHeads(searcher.maxDoc()));
} else {
return base;
}
}
