virtuoso.jena.driver

Class VirtInfGraph

java.lang.Object

com.hp.hpl.jena.graph.impl.GraphBase

virtuoso.jena.driver.VirtGraph

virtuoso.jena.driver.VirtInfGraph

All Implemented Interfaces:

com.hp.hpl.jena.graph.Graph, com.hp.hpl.jena.graph.GraphAdd, com.hp.hpl.jena.graph.impl.GraphWithPerform, com.hp.hpl.jena.reasoner.InfGraph

public class VirtInfGraph
extends VirtGraph
implements com.hp.hpl.jena.reasoner.InfGraph

Field Summary

Fields inherited from class virtuoso.jena.driver.VirtGraph

DEFAULT

Fields inherited from class com.hp.hpl.jena.graph.impl.GraphBase

TOSTRING_TRIPLE_BASE, TOSTRING_TRIPLE_LIMIT

Fields inherited from interface com.hp.hpl.jena.graph.Graph

emptyGraph

Constructor Summary

Constructors

Constructor and Description
VirtInfGraph(java.lang.String _ruleSet, boolean useSameAs, java.lang.String graphName)
VirtInfGraph(java.lang.String _ruleSet, boolean useSameAs, java.lang.String graphName, java.lang.String url_hostlist, java.lang.String user, java.lang.String password)
VirtInfGraph(java.lang.String _ruleSet, boolean useSameAs, java.lang.String graphName, java.lang.String url_hostlist, java.lang.String user, java.lang.String password, boolean roundrobin)

Method Summary

Methods

Modifier and Type	Method and Description
com.hp.hpl.jena.graph.Graph	cloneWithPremises(com.hp.hpl.jena.graph.Graph premises) Return a new inference graph which is a clone of the current graph together with an additional set of data premises.
com.hp.hpl.jena.util.iterator.ExtendedIterator<com.hp.hpl.jena.graph.Triple>	find(com.hp.hpl.jena.graph.Node subject, com.hp.hpl.jena.graph.Node property, com.hp.hpl.jena.graph.Node object, com.hp.hpl.jena.graph.Graph param) An extension of the Graph.find interface which allows the caller to encode complex expressions in RDF and then refer to those expressions within the query triple.
com.hp.hpl.jena.graph.Graph	getDeductionsGraph() Returns a derivations graph.
java.util.Iterator<com.hp.hpl.jena.reasoner.Derivation>	getDerivation(com.hp.hpl.jena.graph.Triple triple) Return the derivation of the given triple (which is the result of some previous find operation).
com.hp.hpl.jena.graph.Node	getGlobalProperty(com.hp.hpl.jena.graph.Node property) Test a global boolean property of the graph.
com.hp.hpl.jena.graph.Graph	getRawGraph() Return the raw RDF data Graph being processed (i.e. the argument to the Reasonder.bind call that created this InfGraph).
com.hp.hpl.jena.reasoner.Reasoner	getReasoner() Return the Reasoner which is being used to answer queries to this graph.
void	prepare() Perform any initial processing and caching.
void	rebind() Cause the inference graph to reconsult the underlying graph to take into account changes.
void	rebind(com.hp.hpl.jena.graph.Graph data) Replace the underlying data graph for this inference graph and start any inferences over again.
void	reset() Reset any internal caches.
void	setDerivationLogging(boolean logOn) Switch on/off drivation logging
boolean	testGlobalProperty(com.hp.hpl.jena.graph.Node property) A convenience version of getGlobalProperty which can only return a boolean result.
com.hp.hpl.jena.reasoner.ValidityReport	validate() Test the consistency of the bound data.

Methods inherited from class virtuoso.jena.driver.VirtGraph

clear, clear, close, createRuleSet, getBulkUpdateHandler, getConnection, getCount, getDataSource, getFetchSize, getGraphName, getGraphPassword, getGraphUrl, getGraphUser, getPrefixMapping, getQueryTimeout, getReadFromAllGraphs, getRuleSet, getSameAs, getTransactionHandler, getXAResource, graphBaseFind, Node2Str, Object2Node, performAdd, performDelete, read, reifierSize, reifierTriples, remove, remove, removeRuleSet, setFetchSize, setQueryTimeout, setReadFromAllGraphs, setRuleSet, setSameAs

Methods inherited from class com.hp.hpl.jena.graph.impl.GraphBase

add, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getCapabilities, getEventManager, getStatisticsHandler, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, remove, size, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.hp.hpl.jena.graph.Graph

add, clear, close, contains, contains, delete, dependsOn, find, find, getBulkUpdateHandler, getCapabilities, getEventManager, getPrefixMapping, getStatisticsHandler, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, remove, size

Constructor Detail

VirtInfGraph

public VirtInfGraph(java.lang.String _ruleSet,
            boolean useSameAs,
            java.lang.String graphName)

VirtInfGraph

public VirtInfGraph(java.lang.String _ruleSet,
            boolean useSameAs,
            java.lang.String graphName,
            java.lang.String url_hostlist,
            java.lang.String user,
            java.lang.String password)

VirtInfGraph

public VirtInfGraph(java.lang.String _ruleSet,
            boolean useSameAs,
            java.lang.String graphName,
            java.lang.String url_hostlist,
            java.lang.String user,
            java.lang.String password,
            boolean roundrobin)

Method Detail

getRawGraph

public com.hp.hpl.jena.graph.Graph getRawGraph()

Return the raw RDF data Graph being processed (i.e. the argument to the Reasonder.bind call that created this InfGraph).

Specified by:

getRawGraph in interface com.hp.hpl.jena.reasoner.InfGraph

getReasoner

public com.hp.hpl.jena.reasoner.Reasoner getReasoner()

Return the Reasoner which is being used to answer queries to this graph.

Specified by:

getReasoner in interface com.hp.hpl.jena.reasoner.InfGraph

rebind

public void rebind(com.hp.hpl.jena.graph.Graph data)

Replace the underlying data graph for this inference graph and start any inferences over again. This is primarily using in setting up ontology imports processing to allow an imports multiunion graph to be inserted between the inference graph and the raw data, before processing.

Specified by:

rebind in interface com.hp.hpl.jena.reasoner.InfGraph

Parameters:

data - the new raw data graph

rebind

public void rebind()

Cause the inference graph to reconsult the underlying graph to take into account changes. Normally changes are made through the InfGraph's add and remove calls are will be handled appropriately. However, in some cases changes are made "behind the InfGraph's back" and this forces a full reconsult of the changed data.

Specified by:

rebind in interface com.hp.hpl.jena.reasoner.InfGraph

prepare

public void prepare()

Perform any initial processing and caching. This call is optional. Most engines either have negligable set up work or will perform an implicit "prepare" if necessary. The call is provided for those occasions where substantial preparation work is possible (e.g. running a forward chaining rule system) and where an application might wish greater control over when this prepration is done.

Specified by:

prepare in interface com.hp.hpl.jena.reasoner.InfGraph

reset

public void reset()

Reset any internal caches. Some systems, such as the tabled backchainer, retain information after each query. A reset will wipe this information preventing unbounded memory use at the expense of more expensive future queries. A reset does not cause the raw data to be reconsulted and so is less expensive than a rebind.

Specified by:

reset in interface com.hp.hpl.jena.reasoner.InfGraph

getGlobalProperty

public com.hp.hpl.jena.graph.Node getGlobalProperty(com.hp.hpl.jena.graph.Node property)

Test a global boolean property of the graph. This might included properties like consistency, OWLSyntacticValidity etc. It remains to be seen what level of generality is needed here. We could replace this by a small number of specific tests for common concepts.

Specified by:

getGlobalProperty in interface com.hp.hpl.jena.reasoner.InfGraph

Parameters:

property - the URI of the property to be tested

Returns:

a Node giving the value of the global property, this may be a boolean literal, some other literal value (e.g. a size).

testGlobalProperty

public boolean testGlobalProperty(com.hp.hpl.jena.graph.Node property)

A convenience version of getGlobalProperty which can only return a boolean result.

Specified by:

testGlobalProperty in interface com.hp.hpl.jena.reasoner.InfGraph

validate

public com.hp.hpl.jena.reasoner.ValidityReport validate()

Test the consistency of the bound data. This normally tests the validity of the bound instance data against the bound schema data.

Specified by:

validate in interface com.hp.hpl.jena.reasoner.InfGraph

Returns:

a ValidityReport structure

find

public com.hp.hpl.jena.util.iterator.ExtendedIterator<com.hp.hpl.jena.graph.Triple> find(com.hp.hpl.jena.graph.Node subject,
                                                                                com.hp.hpl.jena.graph.Node property,
                                                                                com.hp.hpl.jena.graph.Node object,
                                                                                com.hp.hpl.jena.graph.Graph param)

An extension of the Graph.find interface which allows the caller to encode complex expressions in RDF and then refer to those expressions within the query triple. For example, one might encode a class expression and then ask if there are any instances of this class expression in the InfGraph.

Specified by:

find in interface com.hp.hpl.jena.reasoner.InfGraph

Parameters:

subject - the subject Node of the query triple, may be a Node in the graph or a node in the parameter micro-graph or null

property - the property to be retrieved or null

object - the object Node of the query triple, may be a Node in the graph or a node in the parameter micro-graph.

param - a small graph encoding an expression which the subject and/or object nodes refer.

cloneWithPremises

public com.hp.hpl.jena.graph.Graph cloneWithPremises(com.hp.hpl.jena.graph.Graph premises)

Return a new inference graph which is a clone of the current graph together with an additional set of data premises. The default implementation loses ALL partial deductions so far. Some subclasses may be able to a more efficient job.

setDerivationLogging

public void setDerivationLogging(boolean logOn)

Switch on/off drivation logging

Specified by:

setDerivationLogging in interface com.hp.hpl.jena.reasoner.InfGraph

getDerivation

public java.util.Iterator<com.hp.hpl.jena.reasoner.Derivation> getDerivation(com.hp.hpl.jena.graph.Triple triple)

Return the derivation of the given triple (which is the result of some previous find operation). Not all reasoneers will support derivations.

Specified by:

getDerivation in interface com.hp.hpl.jena.reasoner.InfGraph

Returns:

an iterator over Derivation records or null if there is no derivation information available for this triple.

getDeductionsGraph

public com.hp.hpl.jena.graph.Graph getDeductionsGraph()

Returns a derivations graph. The rule reasoners typically create a graph containing those triples added to the base graph due to rule firings. In some applications it can useful to be able to access those deductions directly, without seeing the raw data which triggered them. In particular, this allows the forward rules to be used as if they were rewrite transformation rules.

Specified by:

getDeductionsGraph in interface com.hp.hpl.jena.reasoner.InfGraph

Returns:

the deductions graph, if relevant for this class of inference engine or null if not.