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


java.lang.Object
   com.hp.hpl.jena.graph.query.GuardArranger

GuardArranger
public class GuardArranger (Code)
A GuardArranger is initialised with a set of triple patterns, and can then turn a set of constraints (plus a map giving the location of variables) into an array of guards, where the i'th element of the array is the set of constraints that can be evaluated as soon as the i'th triple-pattern has been processed.


Field Summary
protected  Set[]boundVariables
    
protected  intsize
    

Constructor Summary
public  GuardArranger(Triple[] triples)
    

Method Summary
protected  booleancanEval(Expression e, int index)
     Answer true iff this Expression can be evaluated after the index'th triple has been matched, ie, all the variables of the expression have been bound.
protected  Set[]makeBoundVariables(Triple[] triples)
     Answer an array of sets exactly as long as the argument array of Triples.
public  ValuatorSet[]makeGuards(Mapping map, ExpressionSet constraints)
    
protected  ValuatorSet[]makeGuards(Mapping map, ExpressionSet constraints, int length)
     Answer an array of ExpressionSets exactly as long as the supplied length.
protected  voidplantWhereFullyBound(Expression e, Iterator it, Mapping map, ValuatorSet[] es)
     Find the earliest triple index where this expression can be evaluated, add it to the appropriate expression set, and remove it from the original via the iterator.

Field Detail
boundVariables
protected Set[] boundVariables(Code)



size
protected int size(Code)




Constructor Detail
GuardArranger
public GuardArranger(Triple[] triples)(Code)




Method Detail
canEval
protected boolean canEval(Expression e, int index)(Code)
Answer true iff this Expression can be evaluated after the index'th triple has been matched, ie, all the variables of the expression have been bound.



makeBoundVariables
protected Set[] makeBoundVariables(Triple[] triples)(Code)
Answer an array of sets exactly as long as the argument array of Triples. The i'th element of the answer is the set of all variables that have been matched when the i'th triple has been matched.



makeGuards
public ValuatorSet[] makeGuards(Mapping map, ExpressionSet constraints)(Code)



makeGuards
protected ValuatorSet[] makeGuards(Mapping map, ExpressionSet constraints, int length)(Code)
Answer an array of ExpressionSets exactly as long as the supplied length. The i'th ExpressionSet contains the prepared [against map] expressions that can be evaluated as soon as the i'th triple has been matched. By "can be evaluated as soon as" we mean that all its variables are bound. The original ExpressionSet is updated by removing those elements that can be so evaluated.
Parameters:
  map - the Mapping to prepare Expressions against
Parameters:
  constraints - the set of constraint expressions to plant
Parameters:
  length - the number of evaluation slots available the array of prepared ExpressionSets



plantWhereFullyBound
protected void plantWhereFullyBound(Expression e, Iterator it, Mapping map, ValuatorSet[] es)(Code)
Find the earliest triple index where this expression can be evaluated, add it to the appropriate expression set, and remove it from the original via the iterator.



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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