Examples of org.apache.pig.newplan.DependencyOrderWalker

org.apache.pig.newplan.DependencyOrderWalker
A walker to walk graphs in dependency order. It is guaranteed that a node will not be visited until all of its predecessors have been visited. This is equivalent to doing a topilogical sort on the graph and then visiting the nodes in order.

        class CastFinder extends AllExpressionVisitor {
            List<CastExpression> casts = new ArrayList<CastExpression>();


            public CastFinder(OperatorPlan plan)
                    throws FrontendException {
                super(plan, new DependencyOrderWalker(plan));
            }

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        plan.connect(fred, joe);
        plan.connect(joe, bob);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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        plan.connect(joe, bob);
        plan.connect(bob, jill);
        plan.connect(jane, jill);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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        plan.connect(joe, bob);
        plan.connect(bob, jill);
        plan.connect(bob, jane);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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                    }
                }
                
                // visit expression associated with currOp. If it refers to any other operator
                // that operator is also going to be enqueued.
                currOp.accept( new AllExpressionVisitor( plan, new DependencyOrderWalker( plan ) ) {
                        @Override
                        protected LogicalExpressionVisitor getVisitor(LogicalExpressionPlan exprPlan)
                        throws FrontendException {
                            return new LogicalExpressionVisitor( exprPlan, new DependencyOrderWalker( exprPlan ) ) {
                                @Override
                                public void visit(ScalarExpression expr) throws FrontendException {
                                    Operator refOp = expr.getImplicitReferencedOperator();
                                    if( !queue.contains( refOp ) )
                                        queue.add( refOp );

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                    }
                }


                // visit expression associated with currOp. If it refers to any other operator
                // that operator is also going to be enqueued.
                currOp.accept( new AllExpressionVisitor( plan, new DependencyOrderWalker( plan ) ) {
                        @Override
                        protected LogicalExpressionVisitor getVisitor(LogicalExpressionPlan exprPlan)
                        throws FrontendException {
                            return new LogicalExpressionVisitor( exprPlan, new DependencyOrderWalker( exprPlan ) ) {
                                @Override
                                public void visit(ScalarExpression expr) throws FrontendException {
                                    Operator refOp = expr.getImplicitReferencedOperator();
                                    if( !queue.contains( refOp ) )
                                        queue.add( refOp );

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public class ScalarVisitor extends AllExpressionVisitor {
    private final PigContext pigContext;
    private final String scope;
    
    public ScalarVisitor(OperatorPlan plan, PigContext pigContext, String scope) throws FrontendException {
        super( plan, new DependencyOrderWalker( plan ) );
        this.pigContext = pigContext;
        this.scope = scope;
    }

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    }


    @Override
    protected LogicalExpressionVisitor getVisitor(final LogicalExpressionPlan exprPlan)
    throws FrontendException {
        return new LogicalExpressionVisitor( exprPlan, new DependencyOrderWalker( exprPlan ) ) {


            @Override
            public void visit(ScalarExpression expr) throws FrontendException {
                // This is a scalar udf.
                ConstantExpression filenameConst = (ConstantExpression)exprPlan.getSuccessors( expr ).get( 1 );

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    // then the mapping is stored here
    Map<LogicalRelationalOperator, FuncSpec>  rel2InputFuncMap = 
        new HashMap<LogicalRelationalOperator, FuncSpec>();
    
    public LineageFindRelVisitor(OperatorPlan plan) throws FrontendException {
        super(plan, new DependencyOrderWalker(plan));
        
    }

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    // This value points to the current LogicalRelationalOperator we are working on
    protected LogicalRelationalOperator currentOp;
    
    public ExpToPhyTranslationVisitor(OperatorPlan plan, LogicalRelationalOperator op, PhysicalPlan phyPlan, 
            Map<Operator, PhysicalOperator> map) throws FrontendException {
        this(plan, new DependencyOrderWalker(plan), op, phyPlan, map);
    }

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