Apache Syncope - Get all groups for user.java

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.collections4.list.SetUniqueList;

// Given this user...
UserTO userTO = ...

List<String> groupKeys = SetUniqueList.setUniqueList(new ArrayList<String>());

// First statically assigned groups...
CollectionUtils.collect(userTO.getMemberships(), new Transformer<MembershipTO, String>() {

    @Override
    public String transform(final MembershipTO input) {
        return input.getGroupKey();
    }
  }, groupKeys);

// ...then dinamically assigned groups
groupKeys.addAll(userTO.getDynGroups());

if (!groupKeys.isEmpty()) {
  String fiql;
  if (groupKeys.size() == 1) {
    fiql = SyncopeClient.getGroupSearchConditionBuilder().
            is("key").
            equalTo(groupKeys.get(0)).
            query();
  } else {
    fiql = SyncopeClient.getGroupSearchConditionBuilder().
            is("key").
            equalTo(groupKeys.get(0),
                    groupKeys.subList(1, groupKeys.size() - 1).toArray(new String[groupKeys.size() - 1])).
            query();
  }

  // without page / size parameters in the AnyQuery instance above, this will only
  // return the first 25 groups at most
  PagedResult<GroupTO> result = syncopeClient.getService(GroupService.class).search(
                    new AnyQuery.Builder().
                    realm(SyncopeConstants.ROOT_REALM).
                    fiql(fiql).
                    build());
  List<GroupTO> groups = result.getResult();
}

This is reported working with Apache Syncope 2.0.0-M4; for later versions the code above simply becomes

String userKey = ...; // user key as UUID
PagedResult<GroupTO> groups = groupService.search(
                new AnyQuery.Builder().
                realm(SyncopeConstants.ROOT_REALM).
                fiql(SyncopeClient.getGroupSearchConditionBuilder().withMembers(userKey).query()).
                build());
List<GroupTO> groups = result.getResult();

Hi Francesco, thanks very much for the sample !

Just a minor glitch in https://gist.github.com/ilgrosso/3d56e9c57db283bfaef0068bdbc9b697#file-apache-syncope-get-all-groups-for-user-java-L33, should be :
fiql = SyncopeClient.getGroupSearchConditionBuilder().is("key").equalTo(groupKeys.get(0),
groupKeys.subList(1, groupKeys.size()).toArray(new String[groupKeys.size() - 1])).query();

@gonzalad fixed, thanks for reporting