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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl.oldCode

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

com.hp.hpl.jena.reasoner.rulesys.impl.oldCode .GoalResults

GoalResults
public class GoalResults (Code)
	Part of the backward chaining rule interpreter. The goal table is a table of partially evaluated goals. Each entry is an instance of GoalResults which contains the goal (a generalized triple pattern which supports structured literals), a set of triple values, a completion flag and a generator (which represents a continuation point for finding further goal values). This is essentially an encapsulation of the OR graph of the evaluation trace. This implementation is not very space efficient. Once a GoalResult is complete we could flush all the results out to a single shared deductions graph in the inference engine wrapper. Care would be needed to do this in a thread-safe fashion since there can be multiple GoalStates scanning each GoalResult at any given time. author: Dave Reynolds version: $Revision: 1.8 $ on $Date: 2008/01/02 12:09:45 $

Field Summary
protected Set	dependents
protected BRuleEngine	engine
protected TriplePattern	goal
protected boolean	isComplete
protected boolean	isSingleton
static Log	logger
protected int	refCount
protected ArrayList	resultSet
protected HashSet	resultSetIndex
protected boolean	started

Constructor Summary
public	GoalResults(TriplePattern goal, BRuleEngine ruleEngine) Contructor.

Method Summary
public void	addDependent(RuleState dependent)
public boolean	addResult(Triple result) Add a new result to the result set for this goal.
public void	decRefCount() Decrement the reference count, called when a RuleState for this result set either fails or completes.
public void	flushDependents() Move all the blocked dependents to the agenda for further processing.
public BRuleEngine	getEngine()
public Triple	getResult(int n) Return the n'th memoized result for this goal.
public void	incRefCount() Increment the reference count, called when a new RuleState refering to this result set is created.
public boolean	isComplete() Return true of this goal is known to have been completely evaluated.
public int	numResults() Return the number of available memoized results for this goal.
public void	setAllComplete() Indicate that all goals have been completed, sets this to complete but does not bother to add the dependents to the agenda.
public void	setComplete() Indicate that the goal has completed.
public void	start() Start up a GoalResults stream.
public String	toString()

Field Detail

dependents
protected Set dependents(Code)
	The set of RuleStates which are currently blocked waiting for this table entry to have more results

engine
protected BRuleEngine engine(Code)
	The rule engine which this table entry is part of

goal
protected TriplePattern goal(Code)
	The goal who values are being memoised by this entry

isComplete
protected boolean isComplete(Code)
	True if all the values for this goal are known

isSingleton
protected boolean isSingleton(Code)
	Flag to indicate that the goal is a singleton and so should close once one result is in

logger
static Log logger(Code)

refCount
protected int refCount(Code)
	Reference count of the number of rulestates working on values for this entry

resultSet
protected ArrayList resultSet(Code)
	The sequence of answers available so far

resultSetIndex
protected HashSet resultSetIndex(Code)
	A searchable version of the resultSet

started
protected boolean started(Code)
	True if this goal generator has started running

Constructor Detail

GoalResults
public GoalResults(TriplePattern goal, BRuleEngine ruleEngine)(Code)
	Contructor. Parameters: goal - the goal whose matches are to be memoised. Parameters: ruleEngine - the parent rule engine for the goal table containing this entry

Method Detail

addDependent
public void addDependent(RuleState dependent)(Code)
	Record that a rule node has suspened waiting for more results from this subgoal

addResult
public boolean addResult(Triple result)(Code)
	Add a new result to the result set for this goal. ture if this is a new result for this goal

decRefCount
public void decRefCount()(Code)
	Decrement the reference count, called when a RuleState for this result set either fails or completes.

flushDependents
public void flushDependents()(Code)
	Move all the blocked dependents to the agenda for further processing.

getEngine
public BRuleEngine getEngine()(Code)
	Return the rule engine processing this goal

getResult
public Triple getResult(int n)(Code)
	Return the n'th memoized result for this goal.

incRefCount
public void incRefCount()(Code)
	Increment the reference count, called when a new RuleState refering to this result set is created.

isComplete
public boolean isComplete()(Code)
	Return true of this goal is known to have been completely evaluated.

numResults
public int numResults()(Code)
	Return the number of available memoized results for this goal.

setAllComplete
public void setAllComplete()(Code)
	Indicate that all goals have been completed, sets this to complete but does not bother to add the dependents to the agenda.

setComplete
public void setComplete()(Code)
	Indicate that the goal has completed.

start
public void start()(Code)
	Start up a GoalResults stream. This finds all the relevant rules and adds initial states for them to the agenda.

toString
public String toString()(Code)
	Printable form

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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