com.hp.hpl.jena.reasoner.transitiveReasoner
Class TransitiveReasoner

java.lang.Object
  com.hp.hpl.jena.reasoner.transitiveReasoner.TransitiveReasoner

All Implemented Interfaces:

Reasoner

Direct Known Subclasses:

RDFSReasoner

public class TransitiveReasoner

extends java.lang.Object

implements Reasoner

A simple "reasoner" used to help with API development.

This reasoner caches a transitive closure of the subClass and subProperty graphs. The generated infGraph allows both the direct and closed versions of these properties to be retrieved. The cache is built when the tbox is bound in but if the final data graph contains additional subProperty/subClass declarations then the cache has to be rebuilt.

The triples in the tbox (if present) will also be included in any query. Any of tbox or data graph are allowed to be null.

Version:

$Revision: 1.14 $ on $Date: 2003/06/23 15:54:27 $

Author:

Dave Reynolds

Field Summary

static Node	directSubClassOf The direct (minimal) version of the subClassOf property
static Node	directSubPropertyOf The direct (minimal) version of the subPropertyOf property
static Node	subClassOf The normal subClassOf property
static Node	subPropertyOf The normal subPropertyOf property

Constructor Summary

TransitiveReasoner()
Constructor

Method Summary

InfGraph	bind(Graph data) Attach the reasoner to a set of RDF ddata to process.
Reasoner	bindSchema(Graph tbox) Extracts all of the subClass and subProperty declarations from the given schema/tbox and caches the resultant graphs.
Reasoner	bindSchema(Model tbox) Extracts all of the subClass and subProperty declarations from the given schema/tbox and caches the resultant graphs.
Model	getCapabilities() Return a description of the capabilities of this reasoner encoded in RDF.
TransitiveGraphCache	getSubClassCache() Accessor used during infgraph construction - return the cached version of the subClass lattice.
TransitiveGraphCache	getSubPropertyCache() Accessor used during infgraph construction - return the cached version of the subProperty lattice.
Finder	getTbox() Accessor used during infgraph construction - return the partially bound tbox, if any.
void	setDerivationLogging(boolean logOn) Switch on/off drivation logging.
void	setParameter(java.lang.String parameterUri, java.lang.Object value) Set a configuration paramter for the reasoner.
boolean	supportsProperty(Property property) Determine whether the given property is recognized and treated specially by this reasoner.

Methods inherited from class java.lang.Object

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

Field Detail

directSubPropertyOf

public static Node directSubPropertyOf

The direct (minimal) version of the subPropertyOf property

directSubClassOf

public static Node directSubClassOf

The direct (minimal) version of the subClassOf property

subPropertyOf

public static Node subPropertyOf

The normal subPropertyOf property

subClassOf

public static Node subClassOf

The normal subClassOf property

Constructor Detail

TransitiveReasoner

public TransitiveReasoner()

Constructor

Method Detail

getCapabilities

public Model getCapabilities()

Return a description of the capabilities of this reasoner encoded in RDF. These capabilities may be static or may depend on configuration information supplied at construction time. May be null if there are no useful capabilities registered.

Specified by:

getCapabilities in interface Reasoner

supportsProperty

public boolean supportsProperty(Property property)

Determine whether the given property is recognized and treated specially by this reasoner. This is a convenience packaging of a special case of getCapabilities.

Specified by:

supportsProperty in interface Reasoner

Parameters:

property - the property which we want to ask the reasoner about, given as a Node since this is part of the SPI rather than API

Returns:

true if the given property is handled specially by the reasoner.

bindSchema

public Reasoner bindSchema(Graph tbox)
                    throws ReasonerException

Extracts all of the subClass and subProperty declarations from the given schema/tbox and caches the resultant graphs. It can only be used once, can't stack up multiple tboxes this way. This limitation could be lifted - the only difficulty is the need to reprocess all the earlier tboxes if a new subPropertyOf subPropertyOf subClassOf is discovered.

Specified by:

bindSchema in interface Reasoner

Parameters:

tbox - schema containing the property and class declarations

Returns:

a reasoner instace which can be used to process a data graph, it may be the same instance - bindSchema is not required to be side-effect free.

Throws:

ReasonerException - if the reasoner cannot be bound to a rule set in this way, for example if the underlying engine can only accept a single rule set in this way and one rule set has already been bound in of if the ruleset is illformed.

bindSchema

public Reasoner bindSchema(Model tbox)
                    throws ReasonerException

Extracts all of the subClass and subProperty declarations from the given schema/tbox and caches the resultant graphs. It can only be used once, can't stack up multiple tboxes this way. This limitation could be lifted - the only difficulty is the need to reprocess all the earlier tboxes if a new subPropertyOf subPropertyOf subClassOf is discovered.

Specified by:

bindSchema in interface Reasoner

Parameters:

tbox - schema containing the property and class declarations

Returns:

a reasoner instace which can be used to process a data graph, it may be the same instance - bindSchema is not required to be side-effect free.

Throws:

ReasonerException - if the reasoner cannot be bound to a rule set in this way, for example if the underlying engine can only accept a single rule set in this way and one rule set has already been bound in of if the ruleset is illformed.

bind

public InfGraph bind(Graph data)
              throws ReasonerException

Attach the reasoner to a set of RDF ddata to process. The reasoner may already have been bound to specific rules or ontology axioms (encoded in RDF) through earlier bindRuleset calls.

Specified by:

bind in interface Reasoner

Parameters:

data - the RDF data to be processed, some reasoners may restrict the range of RDF which is legal here (e.g. syntactic restrictions in OWL).

Returns:

an inference graph through which the data+reasoner can be queried.

Throws:

ReasonerException - if the data is ill-formed according to the constraints imposed by this reasoner.

setDerivationLogging

public void setDerivationLogging(boolean logOn)

Switch on/off drivation logging. If set to true then the InfGraph created from the bind operation will start life with recording of derivations switched on. This is currently only of relevance to rule-based reasoners.

Default - false.

Specified by:

setDerivationLogging in interface Reasoner

setParameter

public void setParameter(java.lang.String parameterUri,
                         java.lang.Object value)

Set a configuration paramter for the reasoner. In the case of the this reasoner there are no configuration parameters and this method is simply here to meet the interfaces specification

Specified by:

setParameter in interface Reasoner

Parameters:

parameterUri - the uri identifying the parameter to be changed

value - the new value for the parameter, typically this is a wrapped java object like Boolean or Integer.

getSubPropertyCache

public TransitiveGraphCache getSubPropertyCache()

Accessor used during infgraph construction - return the cached version of the subProperty lattice.

getSubClassCache

public TransitiveGraphCache getSubClassCache()

Accessor used during infgraph construction - return the cached version of the subClass lattice.

getTbox

public Finder getTbox()

Accessor used during infgraph construction - return the partially bound tbox, if any.