Module org.apache.jena.core

Package org.apache.jena.util

Class MonitorGraph

java.lang.Object

org.apache.jena.graph.impl.WrappedGraph

org.apache.jena.util.MonitorGraph

All Implemented Interfaces:

Graph, GraphWithPerform

public class MonitorGraph
extends WrappedGraph

Graph wrapper which provides normal access to an underlying graph but also maintains a snapshot of the triples it was last known to contain. A snapshot action causes the set of changes between this and the previous snapshot to be calculated and the cache updated. The snapshot process will also fire change notification.

Field Summary

Fields inherited from interface org.apache.jena.graph.Graph

emptyGraph

Constructor Summary

Constructors

Constructor	Description
MonitorGraph(Graph g)	Constructor, wrap the given graph with a state monitor

Method Summary

Modifier and Type	Method	Description
void	snapshot(List<Triple> additions, List<Triple> deletions)	Compute the differences between the current monitored graph and the last snapshot.

Methods inherited from class org.apache.jena.graph.impl.WrappedGraph

add, clear, close, contains, contains, delete, dependsOn, find, find, getCapabilities, getEventManager, getPrefixMapping, getTransactionHandler, getWrapped, isClosed, isEmpty, isIsomorphicWith, performAdd, performDelete, remove, size

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.graph.Graph

add, delete, find, sizeLong, stream, stream

Constructor Details

MonitorGraph

public MonitorGraph(Graph g)

Constructor, wrap the given graph with a state monitor

Method Details

snapshot

public void snapshot(List<Triple> additions,
 List<Triple> deletions)

Compute the differences between the current monitored graph and the last snapshot. The changes will also be forwarded to any listeners. Then take a new snapshot.

Parameters:

additions - a place in which the set of newly added triples should be noted, can be null

deletions - a place in which the set of newly deleted triples should be noted, can be null