Module org.apache.jena.core

Package org.apache.jena.mem2

Class GraphMem2

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.mem.GraphMemBase

org.apache.jena.mem2.GraphMem2

All Implemented Interfaces:

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

Direct Known Subclasses:

GraphMem2Fast, GraphMem2Legacy, GraphMem2Roaring

public class GraphMem2
extends GraphMemBase
implements GraphWithPerform, org.apache.jena.atlas.lib.Copyable<GraphMem2>

A graph that stores triples in memory. This class is not thread-safe. All triples are stored in a TripleStore.

Implementation must always comply to term-equality semantics. The characteristics of the implementations always have handlesLiteralTyping() == false.

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

Method Summary

Modifier and Type	Method	Description
void	clear()	Remove all the statements from this graph.
GraphMem2	copy()	Creates a copy of this graph.
void	destroy()	Subclasses over-ride this method to release any resources they no longer need once fully closed.
boolean	graphBaseContains(Triple tripleMatch)	Answer true if the graph contains any triple matching t.
ExtendedIterator<Triple>	graphBaseFind(Triple tripleMatch)	Returns an ExtendedIterator of all triples in the graph matching the given triple match.
int	graphBaseSize()	Answer the number of triples in this graph.
void	performAdd(Triple t)	Add a triple to the graph without notifying.
void	performDelete(Triple t)	Remove a triple from the triple store.
Stream<Triple>	stream()	Returns a Stream of all triples in the graph.
Stream<Triple>	stream(Node sm, Node pm, Node om)	Returns a Stream of Triples matching a pattern.

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, getCapabilities, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, remove, size, sizeLong

Method Details

destroy

public void destroy()

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

clear

public void clear()

Remove all the statements from this graph.

Specified by:

clear in interface Graph

Overrides:

clear in class GraphBase

performAdd

public void performAdd(Triple t)

Add a triple to the graph without notifying. The default implementation throws an AddDeniedException; subclasses must override if they want to be able to add triples.

Specified by:

performAdd in interface GraphWithPerform

Overrides:

performAdd in class GraphBase

Parameters:

t - triple to add

performDelete

public void performDelete(Triple t)

Remove a triple from the triple store. The default implementation throws a DeleteDeniedException; subclasses must override if they want to be able to remove triples.

Specified by:

performDelete in interface GraphWithPerform

Overrides:

performDelete in class GraphBase

Parameters:

t - triple to delete

stream

public Stream<Triple> stream()

Returns a Stream of all triples in the graph. Note: BaseStream.parallel() is supported.

Specified by:

stream in interface Graph

Returns:

a stream of triples in this graph.

stream

public Stream<Triple> stream(Node sm,
 Node pm,
 Node om)

Returns a Stream of Triples matching a pattern. Note: BaseStream.parallel() is supported.

Specified by:

stream in interface Graph

Parameters:

sm - subject node match pattern

pm - predicate node match pattern

om - object node match pattern

Returns:

a stream of triples in this graph matching the pattern.

graphBaseFind

public ExtendedIterator<Triple> graphBaseFind(Triple tripleMatch)

Returns an ExtendedIterator of all triples in the graph matching the given triple match.

graphBaseContains

public boolean graphBaseContains(Triple tripleMatch)

Answer true if the graph contains any triple matching t. The default implementation uses find and checks to see if the iterator is non-empty.

Parameters:

tripleMatch - triple match pattern, which may be contained

graphBaseSize

public int graphBaseSize()

Answer the number of triples in this graph. Default implementation counts its way through the results of a findAll. Subclasses must override if they want size() to be efficient.

copy

public GraphMem2 copy()

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>

Returns:

independent copy of the current graph