Apache DdlUtils :: how to obtain the sequence name for auto-increment keys?

I am using Apache DdlUtils to query a PostgreSQL database for table and column meta-data (the end-aim being to automatically generate javax.persistence-annotated entity beans). However it seems to me that the DdlUtils library does not provide a way to obtain the names of sequences used in auto-increment columns. The Column class provides an isAutoIncrement method to query for auto-increment status but I couldn't find a way to get the sequence name associated with it. This is part of the DDL in PostgreSQL, eg:

orders=# \dS customer
                         Table "public.customer"
    Column     |       Type        |                    Modifiers
---------------+-------------------+--------------------------------------------------
 id            | integer           | not null default nextval('cst_id_seq'::regclass)
 name          | character varying | not null
 (...)

Should I directly query some metadata / catalogue table instead to obtain that bit of information?

Answering my own question ... Yeap, just like millimoose suggested, it can't be done with DdlUtils and you have to query the information_schema.columns table:

public String getPostgreSQLSequenceForColumn(String database, String table, String column) {
    try {
        Statement stmt = connection.createStatement();
        String sql="select column_default from information_schema.columns where "+
                   "table_catalog='"+database+"' and "                           +
                   "table_schema='public' and "                                  +
                   "table_name='"+table+"' and "                                 +
                   "column_name='"+column+"'";
        ResultSet rs = stmt.executeQuery(sql);
        rs.next();
        String sequenceName = rs.getString(1);
        panicIf(rs.next());
        return sequenceName;
    } catch (Exception e) {
        throw new ExceptionAdapter(e);
    }
}