Module org.apache.jena.core

Package org.apache.jena.ontology.models

Class GraphRefCount

java.lang.Object

org.apache.jena.graph.impl.WrappedGraph

org.apache.jena.ontology.models.GraphRefCount

All Implemented Interfaces:

Graph, GraphWithPerform

public class GraphRefCount
extends WrappedGraph

GraphMemRefCount - a base class for GraphMemValue

GraphMemRefCount maintains a reference count, set to one when it is created, and incremented by the method openAgain(). When the graph is closed, the count is decremented, and when it reaches 0, the tables are trashed and GraphBase.close() called. Thus in normal use one close is enough, but GraphMakers using GraphMems can arrange to re-use the same named graph.

Field Summary

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

emptyGraph

Method Summary

Modifier and Type	Method	Description
void	close()	Close this graph; if it is now fully closed, destroy its resources and run the GraphBase close.
void	destroy()	Sub-classes over-ride this method to release any resources they no longer need once fully closed.
GraphRefCount	openAgain()	Note a re-opening of this graph by incrementing the count.

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

add, clear, contains, contains, delete, find, find, 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

Method Details

openAgain

public GraphRefCount openAgain()

Note a re-opening of this graph by incrementing the count. Answer this Graph.

destroy

public void destroy()

Sub-classes over-ride this method to release any resources they no longer need once fully closed.

close

public void close()

Close this graph; if it is now fully closed, destroy its resources and run the GraphBase close.

Specified by:

close in interface Graph

Overrides:

close in class WrappedGraph