Module org.apache.jena.core

Package org.apache.jena.reasoner.rulesys.impl

Class TempNodeCache

java.lang.Object

org.apache.jena.reasoner.rulesys.impl.TempNodeCache

public class TempNodeCache
extends Object

In some rules we need to be able to create temporary property values which are inferred from ontology constraints but not present in the ground data. This structure is used to manage a pool of such temporary nodes. It is only needed in situations where the data can not be added directly to a deductions graph due to the risk of concurrent access.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TempNodeCache.NodePair	Inner class used to hold and hash a node pair.

Constructor Summary

Constructors

Constructor	Description
TempNodeCache(InfGraph infgraph)	Constructor.

Method Summary

Modifier and Type	Method	Description
Node	getTemp(Node instance, Node prop, Node pclass)	Retrieve or create a bNode representing an inferred property value.

Methods inherited from class java.lang.Object

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

Constructor Details

TempNodeCache

public TempNodeCache(InfGraph infgraph)

Constructor.

Parameters:

infgraph - Parent inference graph, used to be needed for synchronization, don't think we need it any more

Method Details

getTemp

public Node getTemp(Node instance,
 Node prop,
 Node pclass)

Retrieve or create a bNode representing an inferred property value.

Parameters:

instance - the base instance node to which the property applies

prop - the property node whose value is being inferred

pclass - the (optional, can be null) class for the inferred value.

Returns:

the bNode representing the property value