org.apache.jena.sparql.core

Class DatasetGraphOne

java.lang.Object

org.apache.jena.sparql.core.DatasetGraphBase

org.apache.jena.sparql.core.DatasetGraphBaseFind

org.apache.jena.sparql.core.DatasetGraphOne

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, DatasetGraph, Transactional

public class DatasetGraphOne
extends DatasetGraphBaseFind

DatasetGraph of a single graph as default graph. Fixed as one graph (the default) - can not add named graphs.

Constructor Summary

Constructors

Constructor and Description
DatasetGraphOne(Graph graph)

Method Summary

Modifier and Type	Method and Description
void	abort() Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
void	add(Node g, Node s, Node p, Node o) Add a quad
void	add(Quad quad) Add a quad
void	addGraph(Node graphName, Graph graph) Add the given graph to the dataset.
void	begin(ReadWrite mode) Start either a READ or WRITE transaction
void	close() Close the dataset
void	commit() Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
boolean	containsGraph(Node graphNode) Does the DatasetGraph contain a specific named graph? Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation.
void	delete(Node g, Node s, Node p, Node o) Delete a quad
void	delete(Quad quad) Delete a quad
void	end() Finish the transaction - if a write transaction and commit() has not been called, then abort
Iterator<Quad>	find(Node g, Node s, Node p, Node o) Implementation of find based on splitting into triples (default graph) and quads (named graph)
Graph	getDefaultGraph() Get the default graph as a Jena Graph
Graph	getGraph(Node graphNode) Get the graph named by graphNode : returns null on no graph NB Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation.
boolean	isInTransaction() Say whether inside a transaction.
Iterator<Node>	listGraphNodes() Iterate over all names of named graphs
void	removeGraph(Node graphName) Remove all data associated with the named graph
void	setDefaultGraph(Graph g) Set the default graph.
long	size() Get the size (number of named graphs) - may be -1 for unknown
boolean	supportsTransactionAbort() Declare whether Transactional.abort() is supported.
boolean	supportsTransactions() A DatasetGraph supports tranactions if it provides Transactional.begin(org.apache.jena.query.ReadWrite)/ Transactional.commit()/Transactional.end().

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBaseFind

findInUnionGraph, findNG, findQuadsInUnionGraph

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphBase

clear, contains, contains, deleteAny, find, find, getContext, getLock, isEmpty, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DatasetGraphOne

public DatasetGraphOne(Graph graph)

Method Detail

begin

public void begin(ReadWrite mode)

Description copied from interface: Transactional

Start either a READ or WRITE transaction

commit

public void commit()

Description copied from interface: Transactional

Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)

abort

public void abort()

Description copied from interface: Transactional

Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)

isInTransaction

public boolean isInTransaction()

Description copied from interface: Transactional

Say whether inside a transaction.

end

public void end()

Description copied from interface: Transactional

Finish the transaction - if a write transaction and commit() has not been called, then abort

supportsTransactions

public boolean supportsTransactions()

Description copied from interface: DatasetGraph

A DatasetGraph supports tranactions if it provides Transactional.begin(org.apache.jena.query.ReadWrite)/ Transactional.commit()/Transactional.end(). There core storage DatasetGraph that provide fully serialized transactions. DatasetGraph that provide functionality acorss independent systems can not provide such strong guarantees. For example, they may use MRSW locking and some isolation control. Specifically, they do not necessarily provide Transactional.abort().

See DatasetGraph.supportsTransactionAbort() for Transactional.abort(). In addition, check details of a specific implementation.

supportsTransactionAbort

public boolean supportsTransactionAbort()

Description copied from interface: DatasetGraph

Declare whether Transactional.abort() is supported. This goes along with clearing up after exceptions inside application transaction code.

containsGraph

public boolean containsGraph(Node graphNode)

Description copied from interface: DatasetGraph

Does the DatasetGraph contain a specific named graph? Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation. Some datasets are "open" - they have all graphs even if no triples and thsi returns true always.

Specified by:

containsGraph in interface DatasetGraph

Overrides:

containsGraph in class DatasetGraphBase

Returns:

boolean

getDefaultGraph

public Graph getDefaultGraph()

Description copied from interface: DatasetGraph

Get the default graph as a Jena Graph

Specified by:

getDefaultGraph in interface DatasetGraph

Specified by:

getDefaultGraph in class DatasetGraphBase

getGraph

public Graph getGraph(Node graphNode)

Description copied from interface: DatasetGraph

Get the graph named by graphNode : returns null on no graph NB Whether a dataset contains a graph if there are no triples is not defined - see the specifc implementation. Some datasets are "open" - they have all graphs even if no triples,

Specified by:

getGraph in interface DatasetGraph

Specified by:

getGraph in class DatasetGraphBase

listGraphNodes

public Iterator<Node> listGraphNodes()

Description copied from interface: DatasetGraph

Iterate over all names of named graphs

size

public long size()

Description copied from interface: DatasetGraph

Get the size (number of named graphs) - may be -1 for unknown

Specified by:

size in interface DatasetGraph

Overrides:

size in class DatasetGraphBase

add

public void add(Node g,
                Node s,
                Node p,
                Node o)

Description copied from interface: DatasetGraph

Add a quad

Specified by:

add in interface DatasetGraph

Overrides:

add in class DatasetGraphBase

add

public void add(Quad quad)

Description copied from interface: DatasetGraph

Add a quad

Specified by:

add in interface DatasetGraph

Overrides:

add in class DatasetGraphBase

delete

public void delete(Node g,
                   Node s,
                   Node p,
                   Node o)

Description copied from interface: DatasetGraph

Delete a quad

Specified by:

delete in interface DatasetGraph

Overrides:

delete in class DatasetGraphBase

delete

public void delete(Quad quad)

Description copied from interface: DatasetGraph

Delete a quad

Specified by:

delete in interface DatasetGraph

Overrides:

delete in class DatasetGraphBase

setDefaultGraph

public void setDefaultGraph(Graph g)

Description copied from interface: DatasetGraph

Set the default graph. Set the active graph if it was null. This replaces the contents default graph, not merge data into it. Do not assume that the same object is returned by DatasetGraph.getDefaultGraph()

Specified by:

setDefaultGraph in interface DatasetGraph

Overrides:

setDefaultGraph in class DatasetGraphBase

addGraph

public void addGraph(Node graphName,
                     Graph graph)

Description copied from interface: DatasetGraph

Add the given graph to the dataset. Replaces any existing data for the named graph; to add data, get the graph and add triples to it, or add quads to the dataset. Do not assume that the same Java object is returned by DatasetGraph.getGraph(org.apache.jena.graph.Node)

Specified by:

addGraph in interface DatasetGraph

Specified by:

addGraph in class DatasetGraphBase

removeGraph

public void removeGraph(Node graphName)

Description copied from interface: DatasetGraph

Remove all data associated with the named graph

Specified by:

removeGraph in interface DatasetGraph

Specified by:

removeGraph in class DatasetGraphBase

find

public Iterator<Quad> find(Node g,
                           Node s,
                           Node p,
                           Node o)

Description copied from class: DatasetGraphBaseFind

Implementation of find based on splitting into triples (default graph) and quads (named graph)

Specified by:

find in interface DatasetGraph

Overrides:

find in class DatasetGraphBaseFind

See Also:

Graph.find(Node,Node,Node)

close

public void close()

Description copied from interface: DatasetGraph

Close the dataset

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

Specified by:

close in interface DatasetGraph

Overrides:

close in class DatasetGraphBase