protected Column findColumn()

in empire-db-jakarta-faces/src/main/java/org/apache/empire/jakarta/utils/TagEncodingHelper.java [1118:1173]
52 lines of code
12 McCabe index (conditional complexity)

    protected Column findColumn()
    {
        // if parent is a record tag, get the record from there
        Object col = getTagAttributeValue("column");
        if (col instanceof Column)
        {   // cast to column
            return (Column) col;
        }
        if (col instanceof ColumnExpr)
        {   // check component
            if ((component instanceof InputTag || component instanceof ControlTag))
            {   log.warn("ColumnExpresion cannot be used with InputTag or ControlTag");
                throw new InvalidPropertyException("column", column);
            }
            // wrap expression
            return createColumnExprWrapper((ColumnExpr) col);
        }
        if (col instanceof String)
        {   // parse String
            String name = String.valueOf(col);
            int dbix = name.indexOf('.');
            if (dbix<=0)
            {
                log.error("Invalid column expression '{}'!", name);
                return null; // not found
            }
            DBDatabase db = DBDatabase.findByIdentifier(name.substring(0,dbix));
            if (db==null)
            {
                log.error("Database '{}' not found!", name.substring(0,dbix));
                return null; // not found
            }
            int co = name.lastIndexOf('.');
            int to = name.lastIndexOf('.', co - 1);
            String cn = name.substring(co + 1);
            String tn = name.substring(to + 1, co);
            DBRowSet rs = db.getRowSet(tn);
            if (rs == null)
            {
                log.error("Table/View '{}' not found in database!", tn);
                return null; // not found
            }
            Column column = rs.getColumn(cn);
            if (column == null)
            {
                log.error("Column '{}' not found in table/view '{}'!", cn, tn);
                return null; // not found
            }
            // done
            return column;
        }
        // No column!
        if (log.isDebugEnabled() && !(component instanceof LinkTag))
            log.warn("No Column provided for value tag!");
        return null;
    }