DAOUtil daoUtil = new DAOUtil( SQL_QUERY_SELECT_NEWSLETTER_CATEGORY_IDS, plugin );
        daoUtil.setInt( 1, nTopicId );
        daoUtil.executeQuery( );

        List<Integer> list = new ArrayList<Integer>( );

        while ( daoUtil.next( ) )
        {
            int nResultId = daoUtil.getInt( 1 );
            list.add( Integer.valueOf( nResultId ) );
        }

        int [ ] nIdsArray = new int [ list.size( )];

        for ( int i = 0; i < list.size( ); i++ )
        {
            Integer nId = list.get( i );
            nIdsArray [i] = nId.intValue( );
        }

        daoUtil.free( );

        return nIdsArray;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void associateNewsLetterDocumentPortlet( int nTopicId, int nPortletId, Plugin plugin )