void addMember(final TypeMember member){
  Preconditions.checkNotNull(member,"Error: member argument can not be null.");
  Preconditions.checkArgument(member.getParentType() == this,"Error: the member's parent type is not this type.");
  members.add(member);
}

void addMember ( final TypeMember member ) { Preconditions . checkNotNull ( member , "Error: member argument can not be null." ) ; Preconditions . checkArgument ( member . getParentType ( ) == this , "Error: the member's parent type is not this type." ) ; members . add ( member ) ; }
adds a member to this base type .
