com.hp.hpl.jena.util
Class MonitorGraph

java.lang.Object
  com.hp.hpl.jena.graph.impl.WrappedGraph
      com.hp.hpl.jena.util.MonitorGraph

All Implemented Interfaces:

Graph, GraphAdd, com.hp.hpl.jena.graph.impl.GraphWithPerform

public class MonitorGraph
extends com.hp.hpl.jena.graph.impl.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.

Version:

$Revision: 1.1 $

Author:

Dave Reynolds

Field Summary

Fields inherited from interface com.hp.hpl.jena.graph.Graph

emptyGraph

Constructor Summary

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

Method Summary

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

Methods inherited from class com.hp.hpl.jena.graph.impl.WrappedGraph

add, close, contains, contains, delete, dependsOn, find, find, getBulkUpdateHandler, getCapabilities, getEventManager, getPrefixMapping, getReifier, getStatisticsHandler, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, performAdd, performDelete, queryHandler, size

Methods inherited from class java.lang.Object

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

Constructor Detail

MonitorGraph

public MonitorGraph(Graph g)

Constructor, wrap the given graph with a state monitor

Method Detail

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