public class SQLInterpreter {
    public static SelectStatement selectStatement;

    public static void main(String[] args) {
        String query = parseArgs(args);
        buildDatabase();
        QueryPlan qPlan = planFor(query);
        Table result = null;
        try {
            result = qPlan.execute();
        } catch (Exception e) {
            System.err.println("Problem with query: " + query);
            e.printStackTrace();
            System.exit(1);
        }
        System.out.println(result);
    }

    private static QueryPlan planFor(String query) {
        StringReader sbf = new StringReader(query);
        Yylex lexer = new Yylex(sbf);

        parser myParser = new parser(lexer);
        try {
            myParser.parse();
        } catch (Exception ex) {
            System.err.println("syntax error: " + query);
            ex.printStackTrace();
        }

        QueryPlanVisitor visitor = new QueryPlanVisitor();
        selectStatement.accept(visitor);
        return visitor.qPlan;
    }
}