org.aksw.jassa.sparql_path.utils

Class ElementTreeAnalyser

java.lang.Object

org.aksw.jassa.sparql_path.utils.ElementTreeAnalyser

All Implemented Interfaces:

com.hp.hpl.jena.sparql.syntax.ElementVisitor

public class ElementTreeAnalyser
extends Object
implements com.hp.hpl.jena.sparql.syntax.ElementVisitor

Utility class that walks the Elements of an ARQ query tree and collects information that is later used to build an SQL query.

The class provides a different view on the tree of Element instances. In this view, the nodes are ElementTreeAnalyser instances, and the structure of the tree differs in several ways from the Element tree:

• ElementGroups and ElementBlocks are flattened away
• Only OPTIONALs and UNIONs are presented as child nodes
• The difference between ElementTriplePattern and ElementBasePattern is hidden
• Some obvious simplifications have been done, like dropping OPTIONALs that do not bind, or flatten single-element UNIONs
• GRAPH clauses and triples are flattened into triples, quads, and graphNames, where triples are to be matched against the default graph, quads are to be matched against the named graphs, and graphNames are to be matched against the list of graph names, regardless of triples therein.

Version:

$Id$

Author:

Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

Constructors

Constructor and Description
ElementTreeAnalyser(com.hp.hpl.jena.sparql.syntax.Element element)
ElementTreeAnalyser(com.hp.hpl.jena.sparql.syntax.Element element, com.hp.hpl.jena.graph.Node defaultGraphName)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	canBind()
List<com.hp.hpl.jena.sparql.expr.Expr>	getFilterExprs()
List<com.hp.hpl.jena.graph.Node>	getGraphNames()
List<ElementTreeAnalyser>	getOptionals()
List<com.hp.hpl.jena.sparql.core.Quad>	getQuads()
List<ElementTreeAnalyser>	getUnions()
boolean	isEmpty()
boolean	mustMatchTriple()
List<ElementTreeAnalyser>	optionals()
List<ElementTreeAnalyser>	unions()
void	visit(com.hp.hpl.jena.sparql.syntax.ElementAssign el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementBind el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementData el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementDataset el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementExists el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementFetch el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementFilter el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementGroup el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementMinus el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementNamedGraph el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementNotExists el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementOptional el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementPathBlock el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementService el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementSubQuery el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementTriplesBlock el)
void	visit(com.hp.hpl.jena.sparql.syntax.ElementUnion el)

Methods inherited from class java.lang.Object

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

Constructor Detail

ElementTreeAnalyser

public ElementTreeAnalyser(com.hp.hpl.jena.sparql.syntax.Element element)

ElementTreeAnalyser

public ElementTreeAnalyser(com.hp.hpl.jena.sparql.syntax.Element element,
                   com.hp.hpl.jena.graph.Node defaultGraphName)

Method Detail

isEmpty

public boolean isEmpty()

canBind

public boolean canBind()

mustMatchTriple

public boolean mustMatchTriple()

getQuads

public List<com.hp.hpl.jena.sparql.core.Quad> getQuads()

getOptionals

public List<ElementTreeAnalyser> getOptionals()

getGraphNames

public List<com.hp.hpl.jena.graph.Node> getGraphNames()

getUnions

public List<ElementTreeAnalyser> getUnions()

optionals

public List<ElementTreeAnalyser> optionals()

unions

public List<ElementTreeAnalyser> unions()

getFilterExprs

public List<com.hp.hpl.jena.sparql.expr.Expr> getFilterExprs()

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementTriplesBlock el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementFilter el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementUnion el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementOptional el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementGroup el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementNamedGraph el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementPathBlock el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementAssign el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementBind el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementData el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementDataset el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementExists el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementNotExists el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementMinus el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementService el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementFetch el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor

visit

public void visit(com.hp.hpl.jena.sparql.syntax.ElementSubQuery el)

Specified by:

visit in interface com.hp.hpl.jena.sparql.syntax.ElementVisitor