protected List getRowSetList()

in empire-db/src/main/java/org/apache/empire/db/DBCommand.java [1582:1617]

• 34 lines of code
• 17 McCabe index (conditional complexity)

    protected List<DBRowSet> getRowSetList()
    {
        // Check all tables
        int i = 0;
        Set<DBColumn> columns = new HashSet<DBColumn>();
        for (i = 0; select != null && i < select.size(); i++)
            ((DBExpr) select.get(i)).addReferencedColumns(columns);
        for (i = 0; joins != null && i < joins.size(); i++)
            ((DBExpr) joins.get(i)).addReferencedColumns(columns);
        for (i = 0; where != null && i < where.size(); i++)
            ((DBExpr) where.get(i)).addReferencedColumns(columns);
        for (i = 0; groupBy != null && i < groupBy.size(); i++)
            ((DBExpr) groupBy.get(i)).addReferencedColumns(columns);
        for (i = 0; having != null && i < having.size(); i++)
            ((DBExpr) having.get(i)).addReferencedColumns(columns);
        for (i = 0; orderBy != null && i < orderBy.size(); i++)
            ((DBExpr) orderBy.get(i)).addReferencedColumns(columns);
        // now we have all columns
        List<DBRowSet> tables = new ArrayList<DBRowSet>();
        Iterator<DBColumn> iterator = columns.iterator();
        while (iterator.hasNext())
        { // get the table
            DBColumn col = iterator.next();
            DBRowSet table = col.getRowSet();
            if (table == cmdQuery)
            { // Recursion
                log.error("Recursive Column Selection in Command!");
                continue;
            }
            if (tables.contains(table) == false && table != null)
            {   // Add table
                tables.add(table);
            }
        }
        return tables;
    }