Package org.apache.jena.reasoner.rulesys
Class LPBackwardRuleReasoner
- java.lang.Object
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- org.apache.jena.reasoner.rulesys.LPBackwardRuleReasoner
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- All Implemented Interfaces:
Reasoner
public class LPBackwardRuleReasoner extends java.lang.Object implements Reasoner
Reasoner implementation which augments or transforms an RDF graph according to a set of rules. The rules are processed using a tabled LP backchaining interpreter which is implemented by the relevant InfGraph class.
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Constructor Summary
Constructors Constructor Description LPBackwardRuleReasoner(java.util.List<Rule> rules)
Constructor.LPBackwardRuleReasoner(java.util.List<Rule> rules, ReasonerFactory factory)
Constructor
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addDescription(Model configSpec, Resource base)
Add a configuration description for this reasoner into a partial configuration specification model.InfGraph
bind(Graph data)
Attach the reasoner to a set of RDF data to process.Reasoner
bindSchema(Graph tbox)
Precompute the implications of a schema graph.Reasoner
bindSchema(Model tbox)
Precompute the implications of a schema Model.Capabilities
getGraphCapabilities()
Return the Jena Graph Capabilties that the inference graphs generated by this reasoner are expected to conform to.Model
getReasonerCapabilities()
Return a description of the capabilities of this reasoner encoded in RDF.java.util.List<Rule>
getRules()
Return the this of Rules used by this reasonervoid
setDerivationLogging(boolean logOn)
Switch on/off derivation logging.void
setParameter(Property parameter, java.lang.Object value)
Set a configuration paramter for the reasoner.void
setTraceOn(boolean state)
Set the state of the trace flag.boolean
supportsProperty(Property property)
Determine whether the given property is recognized and treated specially by this reasoner.void
tablePredicate(Node predicate)
Register an RDF predicate as one whose presence in a goal should force the goal to be tabled.
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Constructor Detail
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LPBackwardRuleReasoner
public LPBackwardRuleReasoner(java.util.List<Rule> rules)
Constructor. This is the raw version that does not reference a ReasonerFactory and so has no capabilities description.- Parameters:
rules
- a list of Rule instances which defines the ruleset to process
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LPBackwardRuleReasoner
public LPBackwardRuleReasoner(java.util.List<Rule> rules, ReasonerFactory factory)
Constructor- Parameters:
rules
- a list of Rule instances which defines the ruleset to processfactory
- the parent reasoner factory which is consulted to answer capability questions
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Method Detail
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getReasonerCapabilities
public Model getReasonerCapabilities()
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:
getReasonerCapabilities
in interfaceReasoner
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addDescription
public void addDescription(Model configSpec, Resource base)
Add a configuration description for this reasoner into a partial configuration specification model.- Specified by:
addDescription
in interfaceReasoner
- Parameters:
configSpec
- a Model into which the configuration information should be placedbase
- the Resource to which the configuration parameters should be added.
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tablePredicate
public void tablePredicate(Node predicate)
Register an RDF predicate as one whose presence in a goal should force the goal to be tabled.
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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 interfaceReasoner
- 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.
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bindSchema
public Reasoner bindSchema(Graph tbox) throws ReasonerException
Precompute the implications of a schema graph. The statements in the graph will be combined with the data when the final InfGraph is created.- Specified by:
bindSchema
in interfaceReasoner
- Parameters:
tbox
- the ontology axioms or rule set encoded in RDF- Returns:
- a reasoner instace which can be used to process a data graph
- 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.
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bindSchema
public Reasoner bindSchema(Model tbox) throws ReasonerException
Precompute the implications of a schema Model. The statements in the graph will be combined with the data when the final InfGraph is created.- Specified by:
bindSchema
in interfaceReasoner
- Parameters:
tbox
- the ontology axioms or rule set encoded in RDF- Returns:
- a reasoner instace which can be used to process a data graph
- 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.
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bind
public InfGraph bind(Graph data) throws ReasonerException
Attach the reasoner to a set of RDF data 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 interfaceReasoner
- 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.
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getRules
public java.util.List<Rule> getRules()
Return the this of Rules used by this reasoner- Returns:
- a List of Rule objects
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setDerivationLogging
public void setDerivationLogging(boolean logOn)
Switch on/off derivation 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 interfaceReasoner
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setTraceOn
public void setTraceOn(boolean state)
Set the state of the trace flag. If set to true then rule firings are logged out to the Logger at "INFO" level.
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setParameter
public void setParameter(Property parameter, 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 interfaceReasoner
- Parameters:
parameter
- the property identifying the parameter to be changedvalue
- the new value for the parameter, typically this is a wrapped java object like Boolean or Integer.
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getGraphCapabilities
public Capabilities getGraphCapabilities()
Return the Jena Graph Capabilties that the inference graphs generated by this reasoner are expected to conform to.- Specified by:
getGraphCapabilities
in interfaceReasoner
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