Examples of org.drools.core.reteoo.ExistsNode

org.drools.core.reteoo.ExistsNode
ExistsNode extends BetaNode to perform tests for the existence of a Fact plus one or more conditions. Where existence is found the left ReteTuple is copied and propagated. Further to this it maintains the "truth" by canceling any Activations that are no longer considered true by the retraction of ReteTuple's or FactHandleImpl. Tuples are considered to be asserted from the left input and facts from the right input. The BetaNode provides the BetaMemory to store asserted ReteTuples and FactHandleImpls. Each fact handle is stored in the right memory.



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127     public NotNode buildNotNode( int id, LeftTupleSource leftInput, ObjectSource rightInput, BetaConstraints binder, BuildContext context ) {
        return new NotNode( id, leftInput, rightInput, binder, context );
    }


    public ExistsNode buildExistsNode( int id, LeftTupleSource leftInput, ObjectSource rightInput, BetaConstraints binder, BuildContext context ) {
        return new ExistsNode( id, leftInput, rightInput, binder, context );
    }

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            final BetaConstraints betaConstraints = utils.createBetaNodeConstraint( context,
                                                                                    context.getBetaconstraints(),
                                                                                    false );


            ExistsNode node = context.getComponentFactory().getNodeFactoryService().buildExistsNode(context.getNextId(),
                                                                                                    context.getTupleSource(),
                                                                                                    context.getObjectSource(),
                                                                                                    betaConstraints,
                                                                                                    context);


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148                                                               buildContext.getRuleBase().getConfiguration() );                    
                    break;                                        
                        
            }


            ExistsNode existsNode = new ExistsNode( buildContext.getNextId(),
                                                    leftTupleSource,
                                                    rightObjectSource,
                                                    constraints,
                                                    buildContext );
            existsNode.attach(buildContext);
            context.put( name,
                         existsNode );


        } else {
            throw new IllegalArgumentException( "Cannot arguments " + args );

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127     public NotNode buildNotNode( int id, LeftTupleSource leftInput, ObjectSource rightInput, BetaConstraints binder, BuildContext context ) {
        return new NotNode( id, leftInput, rightInput, binder, context );
    }


    public ExistsNode buildExistsNode( int id, LeftTupleSource leftInput, ObjectSource rightInput, BetaConstraints binder, BuildContext context ) {
        return new ExistsNode( id, leftInput, rightInput, binder, context );
    }

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            // then attach the EXISTS node. It will work both as a simple exists node
            // or as subnetwork join node as the context was set appropriatelly
            // in each case
            context.setTupleSource( (LeftTupleSource) utils.attachNode( context,
                                                                        new ExistsNode( context.getNextId(),
                                                                                        context.getTupleSource(),
                                                                                        context.getObjectSource(),
                                                                                        betaConstraints,
                                                                                        context ) ) );
            context.setBetaconstraints( null );

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1575         RightInputAdapterNode riaNode1 = (RightInputAdapterNode) queryElementNode1.getSinkPropagator().getSinks()[0];
        AccumulateNode accNode = (AccumulateNode) riaNode1.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode2 = (QueryElementNode) accNode.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode2 = (RightInputAdapterNode) queryElementNode2.getSinkPropagator().getSinks()[0];
        ExistsNode existsNode = (ExistsNode) riaNode2.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode3 = (QueryElementNode) existsNode.getSinkPropagator().getSinks()[0];
        FromNode fromNode = (FromNode) queryElementNode3.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode3 = (RightInputAdapterNode) fromNode.getSinkPropagator().getSinks()[0];
        NotNode notNode = (NotNode) riaNode3.getSinkPropagator().getSinks()[0];


        StatefulKnowledgeSession ksession = createKnowledgeSession( kbase );

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1575         RightInputAdapterNode riaNode1 = (RightInputAdapterNode) queryElementNode1.getSinkPropagator().getSinks()[0];
        AccumulateNode accNode = (AccumulateNode) riaNode1.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode2 = (QueryElementNode) accNode.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode2 = (RightInputAdapterNode) queryElementNode2.getSinkPropagator().getSinks()[0];
        ExistsNode existsNode = (ExistsNode) riaNode2.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode3 = (QueryElementNode) existsNode.getSinkPropagator().getSinks()[0];
        FromNode fromNode = (FromNode) queryElementNode3.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode3 = (RightInputAdapterNode) fromNode.getSinkPropagator().getSinks()[0];
        NotNode notNode = (NotNode) riaNode3.getSinkPropagator().getSinks()[0];


        StatefulKnowledgeSession ksession = createKnowledgeSession( kbase );

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130             case NodeTypeEnums.JoinNode:
                return new JoinNode(0, leftInput, rightInput, betaConstraints, buildContext);
            case NodeTypeEnums.NotNode:
                return new NotNode(0, leftInput, rightInput, betaConstraints, buildContext);
            case NodeTypeEnums.ExistsNode:
                return new ExistsNode(0, leftInput, rightInput, betaConstraints, buildContext);
        }
        throw new IllegalStateException("Unable to build Node");
    }

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1574         RightInputAdapterNode riaNode1 = (RightInputAdapterNode) queryElementNode1.getSinkPropagator().getSinks()[0];
        AccumulateNode accNode = (AccumulateNode) riaNode1.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode2 = (QueryElementNode) accNode.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode2 = (RightInputAdapterNode) queryElementNode2.getSinkPropagator().getSinks()[0];
        ExistsNode existsNode = (ExistsNode) riaNode2.getSinkPropagator().getSinks()[0];


        QueryElementNode queryElementNode3 = (QueryElementNode) existsNode.getSinkPropagator().getSinks()[0];
        FromNode fromNode = (FromNode) queryElementNode3.getSinkPropagator().getSinks()[0];
        RightInputAdapterNode riaNode3 = (RightInputAdapterNode) fromNode.getSinkPropagator().getSinks()[0];
        NotNode notNode = (NotNode) riaNode3.getSinkPropagator().getSinks()[0];


        StatefulKnowledgeSession ksession = createKnowledgeSession( kbase );

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130             case NodeTypeEnums.JoinNode:
                return new JoinNode(0, leftInput, rightInput, betaConstraints, buildContext);
            case NodeTypeEnums.NotNode:
                return new NotNode(0, leftInput, rightInput, betaConstraints, buildContext);
            case NodeTypeEnums.ExistsNode:
                return new ExistsNode(0, leftInput, rightInput, betaConstraints, buildContext);
        }
        throw new IllegalStateException("Unable to build Node");
    }

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Related Classes of org.drools.core.reteoo.ExistsNode

org.drools.compiler.integrationtests.BackwardChainingTest
org.drools.compiler.phreak.BetaNodeBuilder
org.drools.core.reteoo.builder.GroupElementBuilder$ExistsBuilder
org.drools.core.reteoo.builder.PhreakNodeFactory
org.drools.core.reteoo.test.dsl.ExistsNodeStep
org.drools.core.util.FastIterator
org.drools.core.util.index.RightTupleList
org.drools.core.util.Iterator



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