java - HQL query filtering by @ManyToOne -

i have userclass has relationship roles:

@entity  @table(name="users") @inheritance(strategy = inheritancetype.single_table) @discriminatorvalue("role_admin") @discriminatorcolumn (name="rolename", discriminatortype= discriminatortype.string, length=20) @discriminatoroptions(force = true)  public class user extends baseentity implements userdetails {      @manytoone     @joincolumn(name = "role_id", referencedcolumnname="id")      @notnull(message = "il campo ruolo è obbligatorio")     private role role;      //others fields       //getter & setter  } 

in userdao, have insert / edit / delete ... function , 1 gives me users list:

@override @suppresswarnings("unchecked") public list<user> getusers() {     return getcurrentsession().createquery("from user").list(); } 

now question: build function gives me users have 1 of roles pass function:

public list<user> getusers(list<role> roles) 

how can this? have pass list of ids, or it's pass list of roles?

in both cases, how can write the condition?

thanks