Package org.apache.jena.permissions.query.rewriter

Class OpRewriter

java.lang.Object

org.apache.jena.permissions.query.rewriter.OpRewriter

All Implemented Interfaces:

OpVisitor

public class OpRewriter
extends Object
implements OpVisitor

This class rewrites the query by examining each operation in the algebra returned by the Jena SPARQL parser.

This implementation inserts security evaluator checks where necessary.

Constructor Summary

Constructors

Constructor	Description
OpRewriter(SecurityEvaluator securityEvaluator, String graphIRI)	Constructor
OpRewriter(SecurityEvaluator securityEvaluator, Node graphIRI)	Constructor

Method Summary

Modifier and Type	Method	Description
Op	getResult()	Get the result of the rewrite.
OpRewriter	reset()	Reset the rewriter to the initial state.
void	visit(OpAssign opAssign)	rewrites the subop of assign.
void	visit(OpBGP opBGP)
void	visit(OpConditional opCondition)	Rewrite left and right
void	visit(OpDatasetNames dsNames)	returns the dsNames
void	visit(OpDiff opDiff)	Rewrite left and right
void	visit(OpDisjunction opDisjunction)	Rewrite sequence elements
void	visit(OpDistinct opDistinct)	rewrites the subop of distinct
void	visit(OpExt opExt)	Returns the Ext
void	visit(OpExtend opExtend)	rewrites the subop of extend.
void	visit(OpFilter opFilter)	rewrites the subop of filter.
void	visit(OpGraph opGraph)	rewrites the subop of graph.
void	visit(OpGroup opGroup)	rewrites the subop of group.
void	visit(OpJoin opJoin)	Parses the joins and recursively calls the left and right parts
void	visit(OpLabel opLabel)	returns the label
void	visit(OpLateral opLateral)
void	visit(OpLeftJoin opLeftJoin)	Parses the joins and recursively calls the left and right parts
void	visit(OpList opList)	rewrites the subop of list.
void	visit(OpMinus opMinus)	Rewrite left and right
void	visit(OpNull opNull)	returns the null
void	visit(OpOrder opOrder)	rewrites the subop of order.
void	visit(OpPath opPath)	Returns the path
void	visit(OpProcedure opProc)	rewrites the subop of proc.
void	visit(OpProject opProject)	rewrites the subop of project.
void	visit(OpPropFunc opPropFunc)	rewrites the subop of propFunc.
void	visit(OpQuad opQuad)	Returns the quad
void	visit(OpQuadBlock quadBlock)
void	visit(OpQuadPattern quadPattern)	Returns the quadpattern
void	visit(OpReduced opReduced)	rewrites the subop of reduced.
void	visit(OpSequence opSequence)	Rewrite sequence elements
void	visit(OpService opService)	returns the service
void	visit(OpSlice opSlice)	rewrites the subop of slice This also handles the limit case
void	visit(OpTable opTable)	returns the table
void	visit(OpTopN opTop)	rewrites the subop of top.
void	visit(OpTriple opTriple)	Converts to BGP
void	visit(OpUnion opUnion)	Rewrite left and right

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

OpRewriter

public OpRewriter(SecurityEvaluator securityEvaluator,
 Node graphIRI)

Constructor

Parameters:

securityEvaluator - The security evaluator to use

graphIRI - The IRI for the default graph.

OpRewriter

public OpRewriter(SecurityEvaluator securityEvaluator,
 String graphIRI)

Constructor

Parameters:

securityEvaluator - The security evaluator to use

graphIRI - The IRI for the default graph.

Method Details

getResult

public Op getResult()

Get the result of the rewrite.

Returns:

the resulting operator

reset

public OpRewriter reset()

Reset the rewriter to the initial state.

Returns:

this rewriter for chaining.

visit

public void visit(OpAssign opAssign)

rewrites the subop of assign.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpBGP opBGP)
           throws ReadDeniedException,
AuthenticationRequiredException

Specified by:

visit in interface OpVisitor

Throws:

ReadDeniedException

AuthenticationRequiredException

visit

public void visit(OpLateral opLateral)

Specified by:

visit in interface OpVisitor

visit

public void visit(OpConditional opCondition)

Rewrite left and right

Specified by:

visit in interface OpVisitor

visit

public void visit(OpDatasetNames dsNames)

returns the dsNames

Specified by:

visit in interface OpVisitor

visit

public void visit(OpDiff opDiff)

Rewrite left and right

Specified by:

visit in interface OpVisitor

visit

public void visit(OpDisjunction opDisjunction)

Rewrite sequence elements

Specified by:

visit in interface OpVisitor

visit

public void visit(OpDistinct opDistinct)

rewrites the subop of distinct

Specified by:

visit in interface OpVisitor

visit

public void visit(OpExt opExt)

Returns the Ext

Specified by:

visit in interface OpVisitor

visit

public void visit(OpExtend opExtend)

rewrites the subop of extend.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpFilter opFilter)

rewrites the subop of filter.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpGraph opGraph)

rewrites the subop of graph.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpGroup opGroup)

rewrites the subop of group.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpJoin opJoin)

Parses the joins and recursively calls the left and right parts

Specified by:

visit in interface OpVisitor

visit

public void visit(OpLabel opLabel)

returns the label

Specified by:

visit in interface OpVisitor

visit

public void visit(OpLeftJoin opLeftJoin)

Parses the joins and recursively calls the left and right parts

Specified by:

visit in interface OpVisitor

visit

public void visit(OpList opList)

rewrites the subop of list.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpMinus opMinus)

Rewrite left and right

Specified by:

visit in interface OpVisitor

visit

public void visit(OpNull opNull)

returns the null

Specified by:

visit in interface OpVisitor

visit

public void visit(OpOrder opOrder)

rewrites the subop of order.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpPath opPath)

Returns the path

Specified by:

visit in interface OpVisitor

visit

public void visit(OpProcedure opProc)

rewrites the subop of proc.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpProject opProject)

rewrites the subop of project.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpPropFunc opPropFunc)

rewrites the subop of propFunc.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpQuad opQuad)

Returns the quad

Specified by:

visit in interface OpVisitor

visit

public void visit(OpQuadPattern quadPattern)

Returns the quadpattern

Specified by:

visit in interface OpVisitor

visit

public void visit(OpReduced opReduced)

rewrites the subop of reduced.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpSequence opSequence)

Rewrite sequence elements

Specified by:

visit in interface OpVisitor

visit

public void visit(OpService opService)

returns the service

Specified by:

visit in interface OpVisitor

visit

public void visit(OpSlice opSlice)

rewrites the subop of slice This also handles the limit case

Specified by:

visit in interface OpVisitor

visit

public void visit(OpTable opTable)

returns the table

Specified by:

visit in interface OpVisitor

visit

public void visit(OpTopN opTop)

rewrites the subop of top.

Specified by:

visit in interface OpVisitor

visit

public void visit(OpTriple opTriple)

Converts to BGP

Specified by:

visit in interface OpVisitor

visit

public void visit(OpUnion opUnion)

Rewrite left and right

Specified by:

visit in interface OpVisitor

visit

public void visit(OpQuadBlock quadBlock)

Specified by:

visit in interface OpVisitor