Java Doc for ConsumerChoicePointFrame.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » reasoner » rulesys » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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  LPInterpreterContext context      protected  Generator generator      protected  Node[] pVars      protected  int resultIndex      The index in the generator's result set that we have reached so far. protected  int trailLength      protected  Node[] trailValues      protected  Node_RuleVariable[] trailVars      Constructor Summary public   ConsumerChoicePointFrame(LPInterpreter interpreter)      Constructor. Method Summary public  LPInterpreterContext getConsumingContext()      Return the interpeter context which is reading the results of this consumer. public  Generator getGenerator()      public  void init(LPInterpreter interpreter)      Initialize the choice point state. public  boolean isReady()      Return true if this choice point could usefully be restarted. public synchronized  StateFlag nextMatch(LPInterpreter interpreter)      Find the next result triple and bind the result vars appropriately. public  void preserveState(List trail)      Preserve the state of an interpreter into this frame. public  void pump()      Reactivate this choice point to return new results. public  void restoreState(LPInterpreter interp)      public  void setFinished()      Notify that this consumer choice point has finished consuming all the results of a closed generator. public  void setReady()      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)