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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.hp.hpl.jena.reasoner.rulesys.impl.FrameObject
      com.hp.hpl.jena.reasoner.rulesys.impl.GenericChoiceFrame
         com.hp.hpl.jena.reasoner.rulesys.impl.GenericTripleMatchFrame
            com.hp.hpl.jena.reasoner.rulesys.impl.ConsumerChoicePointFrame

ConsumerChoicePointFrame
public class ConsumerChoicePointFrame extends GenericTripleMatchFrame implements LPAgendaEntry,LPInterpreterState(Code)
Frame in the LPInterpreter's control stack used to represent matching to the results of a tabled predicate. Conventionally the system state which finds and tables the goal results is called the generator and states which require those results are called consumers.

This is used in the inner loop of the interpreter and so is a pure data structure not an abstract data type and assumes privileged access to the interpreter state.


author:
   Dave Reynolds
version:
   $Revision: 1.12 $ on $Date: 2008/01/02 12:06:16 $


Field Summary
protected  LPInterpreterContextcontext
    
protected  Generatorgenerator
    
protected  Node[]pVars
    
protected  intresultIndex
     The index in the generator's result set that we have reached so far.
protected  inttrailLength
    
protected  Node[]trailValues
    
protected  Node_RuleVariable[]trailVars
    

Constructor Summary
public  ConsumerChoicePointFrame(LPInterpreter interpreter)
     Constructor.

Method Summary
public  LPInterpreterContextgetConsumingContext()
     Return the interpeter context which is reading the results of this consumer.
public  GeneratorgetGenerator()
    
public  voidinit(LPInterpreter interpreter)
     Initialize the choice point state.
public  booleanisReady()
     Return true if this choice point could usefully be restarted.
public synchronized  StateFlagnextMatch(LPInterpreter interpreter)
     Find the next result triple and bind the result vars appropriately.
public  voidpreserveState(List trail)
     Preserve the state of an interpreter into this frame.
public  voidpump()
     Reactivate this choice point to return new results.
public  voidrestoreState(LPInterpreter interp)
    
public  voidsetFinished()
     Notify that this consumer choice point has finished consuming all the results of a closed generator.
public  voidsetReady()
     Called by generator when there are more results available.

Field Detail
context
protected LPInterpreterContext context(Code)
The generator or top iterator we are producting results for



generator
protected Generator generator(Code)
The generator whose tabled results we are selecting over



pVars
protected Node[] pVars(Code)
The preserved permanent registers for the pickled interpreter



resultIndex
protected int resultIndex(Code)
The index in the generator's result set that we have reached so far.



trailLength
protected int trailLength(Code)
The length of the preserved trail



trailValues
protected Node[] trailValues(Code)
The preserved trail bound values for the picked interpreter



trailVars
protected Node_RuleVariable[] trailVars(Code)
The preserved trail variables for the picked interpreter




Constructor Detail
ConsumerChoicePointFrame
public ConsumerChoicePointFrame(LPInterpreter interpreter)(Code)
Constructor.
Parameters:
  interpreter - the parent interpreter whose state is to be preserved here, its arg stackdefines the parameters for the target goal




Method Detail
getConsumingContext
public LPInterpreterContext getConsumingContext()(Code)
Return the interpeter context which is reading the results of this consumer.



getGenerator
public Generator getGenerator()(Code)
Return the generator associated with this entry (might be the entry itself)



init
public void init(LPInterpreter interpreter)(Code)
Initialize the choice point state.
Parameters:
  interpreter - the parent interpreter whose state is to be preserved here, its arg stackdefines the parameters for the target goal



isReady
public boolean isReady()(Code)
Return true if this choice point could usefully be restarted.



nextMatch
public synchronized StateFlag nextMatch(LPInterpreter interpreter)(Code)
Find the next result triple and bind the result vars appropriately.
Parameters:
  interpreter - the calling interpreter whose trail should be used FAIL if there are no more matches and the generator is closed, SUSPEND ifthere are no more matches but the generator could generate more, SATISFIED ifa match has been found.



preserveState
public void preserveState(List trail)(Code)
Preserve the state of an interpreter into this frame.



pump
public void pump()(Code)
Reactivate this choice point to return new results.



restoreState
public void restoreState(LPInterpreter interp)(Code)
Restore the state of an interpreter from this frame



setFinished
public void setFinished()(Code)
Notify that this consumer choice point has finished consuming all the results of a closed generator.



setReady
public void setReady()(Code)
Called by generator when there are more results available.



Fields inherited from com.hp.hpl.jena.reasoner.rulesys.impl.GenericTripleMatchFrame
TriplePattern goal(Code)(Java Doc)
Functor objectFunctor(Code)(Java Doc)
Node_RuleVariable objectVar(Code)(Java Doc)
Node_RuleVariable predicateVar(Code)(Java Doc)
Node_RuleVariable subjectVar(Code)(Java Doc)

Methods inherited from com.hp.hpl.jena.reasoner.rulesys.impl.GenericTripleMatchFrame
public boolean bindResult(Triple triple, LPInterpreter interpreter)(Code)(Java Doc)
public boolean functorMatch(Triple t, LPInterpreter interpreter)(Code)(Java Doc)
public void init(LPInterpreter interpreter)(Code)(Java Doc)

Fields inherited from com.hp.hpl.jena.reasoner.rulesys.impl.GenericChoiceFrame
int cac(Code)(Java Doc)
int cpc(Code)(Java Doc)
EnvironmentFrame envFrame(Code)(Java Doc)
int trailIndex(Code)(Java Doc)

Methods inherited from com.hp.hpl.jena.reasoner.rulesys.impl.GenericChoiceFrame
public void init(LPInterpreter interpreter)(Code)(Java Doc)
public void setContinuation(int pc, int ac)(Code)(Java Doc)

Fields inherited from com.hp.hpl.jena.reasoner.rulesys.impl.FrameObject
FrameObject link(Code)(Java Doc)

Methods inherited from com.hp.hpl.jena.reasoner.rulesys.impl.FrameObject
public void close()(Code)(Java Doc)
public void fastLinkTo(FrameObject prior)(Code)(Java Doc)
public FrameObject getLink()(Code)(Java Doc)
public void linkTo(FrameObject prior)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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