UndoInstanceUpdate (Egeria Connector for XTDB 3.10 API)

java.lang.Object
- org.odpi.egeria.connectors.juxt.xtdb.txnfn.AbstractTransactionFunction
- - org.odpi.egeria.connectors.juxt.xtdb.txnfn.UndoInstanceUpdate

Direct Known Subclasses:

UndoEntityUpdate, UndoRelationshipUpdate
```
public abstract class UndoInstanceUpdate
extends AbstractTransactionFunction
```
Base transaction function for rolling back the last changes made to an instance's properties or status.

Constructor Summary

Constructors
Constructor Description

UndoInstanceUpdate()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`protected static clojure.lang.IPersistentVector`	`getPreviousVersionFromCursor(xtdb.api.ICursor<clojure.lang.IPersistentMap> cursor)`	Retrieve only the current and previous versions of the provided XTDB reference, from an already-opened lazily- evaluated cursor.

Methods inherited from class org.odpi.egeria.connectors.juxt.xtdb.txnfn.AbstractTransactionFunction
createTransactionFunction, getGUID, getInstanceProvenanceType, getMetadataCollectionId, getTxnTimeCalculation, getTypeDefForInstance, getTypeDefGUID, incrementVersion, incrementVersion

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - UndoInstanceUpdate
```
public UndoInstanceUpdate()
```
- Method Detail
  - getPreviousVersionFromCursor
```
protected static clojure.lang.IPersistentVector getPreviousVersionFromCursor(xtdb.api.ICursor<clojure.lang.IPersistentMap> cursor)
```
    Retrieve only the current and previous versions of the provided XTDB reference, from an already-opened lazily- evaluated cursor.
    
    Parameters:
    
    cursor - from which to lazily-evaluate the current and previous versions
    
    Returns:
    
    IPersistentVector with the current version as the first element, and the previous version as the second element (or null if there is no previous version)