Find groups of un user by ldapTemplate

[dockflid]

Hello,
First excuse me for my bad english, i hope that you understand me.
i write the code bellow to test if an user belong to a group in my ldap. i use apache directory studio, and the LdapTemplate framework.

public String[] findLdapGroupUsers(String groupID) {
		DistinguishedName dn = new DistinguishedName();
		dn.add("ou","groups");
		dn.add("cn",groupID);
		return (String[]) ldapTemplate.lookup(dn, 
			new ContextMapper() {
				public Object mapFromContext(Object ctx) {
                                        DirContextAdapter adapter  = (DirContextAdapter) ctx;
					return adapter.getStringAttributes("uniqueMember");
				}
			});
	}
 
    private boolean checkInGroupAdmin(String uid){
 
            String[] uniqueMembers = findLdapGroupUsers("Admins");
            for(String um : uniqueMembers){
            	String[] attrs = um.split(",");
            	if(attrs!=null && attrs.length>0){
            		for(String attr : attrs){
            			String[] attributes = attr.split("=");
            			if("uid".equals(attributes[0]) && uid.equals(attributes[1])){
            				return true;
            			}else{
            				continue;
            			}
            		}
            	}
            }

it work perfectly, but it is not optimized.instead of searching all users of a group and iterating the result, i want search the groups of an user.i searched the solution, but still not found it !!
Any suggestions please.

[everald]

It could help you too look into this query I perform when I want to know whether a user has the rights of a group

(&
 (memberOf:1.2.840.113556.1.4.1941:=CN=group_id,OU=groups,DC=my,DC=lan)
 (objectClass=user)
 (uid=username)
)

The part ":1.2.840.113556.1.4.1941:" searchs also for users who are indirectly within this group.
In Java you yould do something like that:

String groupDN = ...;
String username = ...;
AndFilter filter = new AndFilter();
filter.and(new EqualsFilter("memberOf:1.2.840.113556.1.4.1941:", groupDN));
filter.and(new EqualsFilter("objectClass", "user"));
filter.and(new EqualsFilter("uid", username));
ldapTemplate.searchForObject(DistinguishedName.EMPTY_PATH, filter.encode(), new MyMapper());