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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.RETEConflictSet

RETEConflictSet
public class RETEConflictSet (Code)
Manages a set of ready-to-fire rules. For monotonic rule sets we simply fire the rules as soon as they are triggered. For non-monotonic rule sets we stack them up in a conflict set and fire them one-at-a-time, propagating all changes between times.

Note, implementation is not thread-safe. Would be easy to make it so but concurrent adds to InfModel are not supported anyway.
author:
   Dave Reynolds
version:
   $Revision: 1.6 $



Field Summary
protected  ArrayListconflictSet
    
protected  RETERuleContextgcontext
    
protected  booleanisMonotonic
    
protected static  Loglogger
    
protected  intnNeg
    
protected  intnPos
    

Constructor Summary
public  RETEConflictSet(RETERuleContext context, boolean isMonotonic)
    

Method Summary
public  voidadd(Rule rule, BindingEnvironment env, boolean isAdd)
     Record a request for a rule firing.
public static  voidexecute(RETERuleContext context, boolean isAdd)
     Execute a single rule firing.
public  booleanfireOne()
     Pick on pending rule from the conflict set and fire it.
public  booleanisEmpty()
     Return true if there are no more rules awaiting firing.

Field Detail
conflictSet
protected ArrayList conflictSet(Code)
the list of rule activations left to fire



gcontext
protected RETERuleContext gcontext(Code)
the execution context for this conflict set



isMonotonic
protected boolean isMonotonic(Code)
false if the overall rule system contains some non-montotonic rules



logger
protected static Log logger(Code)



nNeg
protected int nNeg(Code)
count the number of negative entries - optimization hack



nPos
protected int nPos(Code)
count the number of positive entries - optimization hack




Constructor Detail
RETEConflictSet
public RETEConflictSet(RETERuleContext context, boolean isMonotonic)(Code)
Construct an empty conflict set, noting whether the overall rule system is monotonic or not




Method Detail
add
public void add(Rule rule, BindingEnvironment env, boolean isAdd)(Code)
Record a request for a rule firing. For monotonic rulesets it may be actioned immediately, otherwise it will be stacked up.



execute
public static void execute(RETERuleContext context, boolean isAdd)(Code)
Execute a single rule firing.



fireOne
public boolean fireOne()(Code)
Pick on pending rule from the conflict set and fire it. Return true if there was a rule to fire.



isEmpty
public boolean isEmpty()(Code)
Return true if there are no more rules awaiting firing.



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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