Method getLogicalRelationalOperators

src/org/apache/pig/newplan/logical/Util.java:195–200

Returns a LinkedList of operators contained within the physical plan which implement the supplied class, in dependency order. Returns an empty LinkedList of no such operators exist. @param plan @param opClass @return a LinkedList of operators contained within the plan which implement the sup

(LogicalPlan plan,
            Class<C> opClass)

     * @throws FrontendException
     */
    public static <C extends LogicalRelationalOperator> LinkedList<C> getLogicalRelationalOperators(LogicalPlan plan,
            Class<C> opClass) throws FrontendException {
        OpFinder<C> finder = new OpFinder<C>(plan, opClass);
        finder.visit();
        return finder.getFoundOps();
    }

    private static class OpFinder<C extends LogicalRelationalOperator> extends LogicalRelationalNodesVisitor {
        final Class<C> opClass;