Module org.apache.jena.core

Package org.apache.jena.mem2

Class GraphMem2Legacy

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.mem.GraphMemBase

org.apache.jena.mem2.GraphMem2

org.apache.jena.mem2.GraphMem2Legacy

All Implemented Interfaces:

org.apache.jena.atlas.lib.Copyable<GraphMem2>, Graph, GraphWithPerform

public class GraphMem2Legacy
extends GraphMem2

A graph that stores triples in memory. This class is not thread-safe.

Purpose: Use this graph implementation if you want to maintain the 'old' behavior of GraphMem or if your memory constraints prevent you from utilizing more memory-intensive solutions.

Slightly improved performance compared to GraphMem Simplified implementation, primarily due to lack of support for Iterator#remove

The heritage of GraphMem:

• Same basic structure
• Same memory consumption
• Also based on HashCommon

This implementation is based on the original GraphMem implementation. The main difference is that it strictly uses term equality for all nodes. The inner workings of the used structures like ArrayBunch and HashedBunchMap are not changed.

Field Summary

Fields inherited from class org.apache.jena.graph.impl.GraphBase

TOSTRING_TRIPLE_BASE, TOSTRING_TRIPLE_LIMIT

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

emptyGraph

Constructor Summary

Constructors

Constructor	Description
GraphMem2Legacy()

Method Summary

Modifier and Type	Method	Description
GraphMem2Legacy	copy()	Creates a copy of this graph.

Methods inherited from class org.apache.jena.mem2.GraphMem2

clear, destroy, getCapabilities, graphBaseContains, graphBaseFind, graphBaseSize, performAdd, performDelete, stream, stream

Methods inherited from class org.apache.jena.mem.GraphMemBase

close, openAgain

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

add, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, remove, size, toString, toString

Methods inherited from class java.lang.Object

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

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

add, add, close, contains, contains, delete, delete, dependsOn, find, find, find, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, remove, size, sizeLong

Constructor Details

GraphMem2Legacy

public GraphMem2Legacy()

Method Details

copy

public GraphMem2Legacy copy()

Description copied from class: GraphMem2

Creates a copy of this graph. Since the triples and nodes are immutable, the copy contains the same triples and nodes as this graph. Modifications to the copy will not affect this graph.

Specified by:

copy in interface org.apache.jena.atlas.lib.Copyable<GraphMem2>

Overrides:

copy in class GraphMem2

Returns:

independent copy of the current graph