Package org.aksw.jenax.path.relgen

Class RelationGeneratorBase

java.lang.Object

org.aksw.jenax.path.relgen.RelationGeneratorBase

Direct Known Subclasses:

RelationGeneratorSimple

public abstract class RelationGeneratorBase
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected List<org.apache.jena.sparql.expr.Expr>	conditions	Conditions imposed the current relation based on the seen path segments
protected com.google.common.hash.HashCode	contextHash
protected String	contextHashStr	Cached String version of the hash
protected List<Fragment>	pastRelations	Relations that have been traversed by the path - does not include the current relation
protected Fragment	relation	The current relation
protected PathPE	relationStartAbsPath	The absolute path at which the relation was requested Once it covers all columns of the relation it is used to compute the next context hash
protected PathPE	relPath	The relative path of segments seen for the current relation Connects to relationStartPath

Constructor Summary

Constructors

Constructor	Description
RelationGeneratorBase()

Method Summary

Modifier and Type	Method	Description
org.apache.jena.sparql.syntax.Element	assemble()	Assemble the complete element
protected com.google.common.hash.HashCode	computeNextHash(com.google.common.hash.HashCode currentHash, PathPE relationStartAbsPath, PathPE relPath)
protected String	encodeHashCode(com.google.common.hash.HashCode hashCode)
void	ensureInit()
Fragment1	getCurrentConcept()
org.apache.jena.sparql.core.Var	getCurrentVar()
List<Fragment>	getPastRelations()
protected abstract Fragment	nextInstance()	Yield the next relation to traverse
Fragment	process(PathPE path)
Fragment	process(UnaryXExpr segment)
protected void	reset()
protected void	setHashCode(com.google.common.hash.HashCode hashCode)
protected void	updateHash()

Methods inherited from class java.lang.Object

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

Field Details

pastRelations

protected List<Fragment> pastRelations

Relations that have been traversed by the path - does not include the current relation

relation

protected Fragment relation

The current relation

contextHash

protected com.google.common.hash.HashCode contextHash

contextHashStr

protected String contextHashStr

Cached String version of the hash

conditions

protected List<org.apache.jena.sparql.expr.Expr> conditions

Conditions imposed the current relation based on the seen path segments

relationStartAbsPath

protected PathPE relationStartAbsPath

The absolute path at which the relation was requested Once it covers all columns of the relation it is used to compute the next context hash

relPath

protected PathPE relPath

The relative path of segments seen for the current relation Connects to relationStartPath

Constructor Details

RelationGeneratorBase

public RelationGeneratorBase()

Method Details

nextInstance

protected abstract Fragment nextInstance()

Yield the next relation to traverse

Parameters:

path -

index -

Returns:

process

public Fragment process(PathPE path)

reset

protected void reset()

ensureInit

public void ensureInit()

process

public Fragment process(UnaryXExpr segment)

getCurrentVar

public org.apache.jena.sparql.core.Var getCurrentVar()

getPastRelations

public List<Fragment> getPastRelations()

getCurrentConcept

public Fragment1 getCurrentConcept()

assemble

public org.apache.jena.sparql.syntax.Element assemble()

Assemble the complete element

updateHash

protected void updateHash()

setHashCode

protected void setHashCode(com.google.common.hash.HashCode hashCode)

encodeHashCode

protected String encodeHashCode(com.google.common.hash.HashCode hashCode)

computeNextHash

protected com.google.common.hash.HashCode computeNextHash(com.google.common.hash.HashCode currentHash,
 PathPE relationStartAbsPath,
 PathPE relPath)