TempNodeCache (Apache Jena)

java.lang.Object
- org.apache.jena.reasoner.rulesys.impl.TempNodeCache

```
public class TempNodeCache
extends java.lang.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

All Methods Instance Methods Concrete Methods
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 Detail
  - 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 Detail
  - 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