Java Doc for ExistsNode.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » reteoo » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.reteoo   Source Cross Reference   Class Diagram   Java Document (Java Doc)   org.drools.reteoo.TupleSource    org.drools.reteoo.BetaNode       org.drools.reteoo.ExistsNode ExistsNode public class ExistsNode extends BetaNode (Code) 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 cancelling 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 assserted ReteTuples and FactHandleImpls. Each fact handle is stored in the right memory. author:    Edson Tirelli Field Summary static  int notAssertObject      static  int notAssertTuple      Constructor Summary public   ExistsNode(int id, TupleSource leftInput, ObjectSource rightInput)      Constructs a new Exists node with EmptyBetaConstraints. public   ExistsNode(int id, TupleSource leftInput, ObjectSource rightInput, BetaConstraints joinNodeBinder)      Construct. Method Summary public  void assertObject(InternalFactHandle handle, PropagationContext context, InternalWorkingMemory workingMemory)      Assert a new FactHandleImpl from the right input. public  void assertTuple(ReteTuple leftTuple, PropagationContext context, InternalWorkingMemory workingMemory)      Assert a new ReteTuple from the left input. public  void retractObject(InternalFactHandle handle, PropagationContext context, InternalWorkingMemory workingMemory)      Retract the FactHandleImpl. public  void retractTuple(ReteTuple leftTuple, PropagationContext context, InternalWorkingMemory workingMemory)      Retract the ReteTuple, any resulting propagated joins are also retracted. public  String toString()      public  void updateSink(TupleSink sink, PropagationContext context, InternalWorkingMemory workingMemory)      Field Detail notAssertObject static int notAssertObject(Code) notAssertTuple static int notAssertTuple(Code) Constructor Detail ExistsNode public ExistsNode(int id, TupleSource leftInput, ObjectSource rightInput)(Code) Constructs a new Exists node with EmptyBetaConstraints. Parameters:   leftInput - The left input TupleSource. Parameters:   rightInput - The right input ObjectSource. ExistsNode public ExistsNode(int id, TupleSource leftInput, ObjectSource rightInput, BetaConstraints joinNodeBinder)(Code) Construct. Parameters:   leftInput - The left input TupleSource. Parameters:   rightInput - The right input ObjectSource. Parameters:   joinNodeBinder - The constraints to be aplied to the right objects Method Detail assertObject public void assertObject(InternalFactHandle handle, PropagationContext context, InternalWorkingMemory workingMemory)(Code) Assert a new FactHandleImpl from the right input. If it matches any left ReteTuple's that had no matches before, propagate tuple as an assertion. Parameters:   handle - The FactHandleImpl being asserted. Parameters:   context - The PropagationContext Parameters:   workingMemory - The working memory seesion. assertTuple public void assertTuple(ReteTuple leftTuple, PropagationContext context, InternalWorkingMemory workingMemory)(Code) Assert a new ReteTuple from the left input. It iterates over the right FactHandleImpl's and if any match is found, a copy of the ReteTuple is made and propagated. Parameters:   tuple - The Tuple being asserted. Parameters:   context - The PropagationContext Parameters:   workingMemory - The working memory seesion. retractObject public void retractObject(InternalFactHandle handle, PropagationContext context, InternalWorkingMemory workingMemory)(Code) Retract the FactHandleImpl. If the handle has any ReteTuple matches and those tuples now have no other match, retract tuple Parameters:   handle - the being retracted Parameters:   context - The PropagationContext Parameters:   workingMemory - The working memory seesion. retractTuple public void retractTuple(ReteTuple leftTuple, PropagationContext context, InternalWorkingMemory workingMemory)(Code) Retract the ReteTuple, any resulting propagated joins are also retracted. Parameters:   leftTuple - The tuple being retracted Parameters:   context - The PropagationContext Parameters:   workingMemory - The working memory seesion. toString public String toString()(Code) updateSink public void updateSink(TupleSink sink, PropagationContext context, InternalWorkingMemory workingMemory)(Code) Updates the given sink propagating all previously propagated tuples to it Fields inherited from org.drools.reteoo.BetaNode final protected BetaConstraints constraints(Code)(Java Doc) final protected TupleSource leftInput(Code)(Java Doc) final protected ObjectSource rightInput(Code)(Java Doc) Methods inherited from org.drools.reteoo.BetaNode public void attach()(Code)(Java Doc) public void attach(InternalWorkingMemory[] workingMemories)(Code)(Java Doc) public Object createMemory(RuleBaseConfiguration config)(Code)(Java Doc) public void dumpMemory(InternalWorkingMemory workingMemory)(Code)(Java Doc) public boolean equals(Object object)(Code)(Java Doc) public BetaNodeFieldConstraint[] getConstraints()(Code)(Java Doc) public ObjectSinkNode getNextObjectSinkNode()(Code)(Java Doc) public TupleSinkNode getNextTupleSinkNode()(Code)(Java Doc) public ObjectTypeNode getObjectTypeNode()(Code)(Java Doc) public ObjectSinkNode getPreviousObjectSinkNode()(Code)(Java Doc) public TupleSinkNode getPreviousTupleSinkNode()(Code)(Java Doc) public List getRules()(Code)(Java Doc) public int hashCode()(Code)(Java Doc) public void remove(BaseNode node, InternalWorkingMemory[] workingMemories)(Code)(Java Doc) public void setNextObjectSinkNode(ObjectSinkNode next)(Code)(Java Doc) public void setNextTupleSinkNode(TupleSinkNode next)(Code)(Java Doc) public void setPreviousObjectSinkNode(ObjectSinkNode previous)(Code)(Java Doc) public void setPreviousTupleSinkNode(TupleSinkNode previous)(Code)(Java Doc) public String toString()(Code)(Java Doc) Fields inherited from org.drools.reteoo.TupleSource protected TupleSinkPropagator sink(Code)(Java Doc) Methods inherited from org.drools.reteoo.TupleSource protected void addTupleSink(TupleSink tupleSink)(Code)(Java Doc) public TupleSinkPropagator getSinkPropagator()(Code)(Java Doc) protected void removeTupleSink(TupleSink tupleSink)(Code)(Java Doc) abstract public void updateSink(TupleSink sink, PropagationContext context, InternalWorkingMemory workingMemory)(Code)(Java Doc)