com.hp.hpl.jena.query

Interface Dataset

All Known Implementing Classes:

DatasetImpl

public interface Dataset

Query is over a Dataset, a collection of named graphs and a background graph (also called the default graph or unnamed graph).

Method Summary

Methods

Modifier and Type	Method and Description
void	abort() Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
void	addNamedModel(String uri, Model model) Set a named graph.
DatasetGraph	asDatasetGraph() Get the dataset in graph form
void	begin(ReadWrite readWrite) Start either a READ or WRITE transaction
void	close() Close the dataset, potentially releasing any associated resources.
void	commit() Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
boolean	containsNamedModel(String uri) Does the dataset contain a model with the name supplied?
void	end() Finish the transaction - if a write transaction and commit() has not been called, then abort
Context	getContext() Get the context associated with this dataset
Model	getDefaultModel() Get the default graph as a Jena Model
Lock	getLock() Get the lock for this dataset
Model	getNamedModel(String uri) Get a graph by name as a Jena Model
boolean	isInTransaction() Say whether a transaction is active
Iterator<String>	listNames() List the names
void	removeNamedModel(String uri) Remove a named graph.
void	replaceNamedModel(String uri, Model model) Change a named graph for another using the same name
void	setDefaultModel(Model model) Set the background graph.
boolean	supportsTransactions() Does this dataset support transactions? Supporting transactions mean that the dataset implementation provides begin(com.hp.hpl.jena.query.ReadWrite), commit(), abort(), end() which otherwise may throw UnsupportedOperationException

Method Detail

getDefaultModel

Model getDefaultModel()

Get the default graph as a Jena Model

setDefaultModel

void setDefaultModel(Model model)

Set the background graph. Can be set to null for none.

getNamedModel

Model getNamedModel(String uri)

Get a graph by name as a Jena Model

containsNamedModel

boolean containsNamedModel(String uri)

Does the dataset contain a model with the name supplied?

addNamedModel

void addNamedModel(String uri,
                 Model model)
                   throws LabelExistsException

Set a named graph.

Throws:

LabelExistsException

removeNamedModel

void removeNamedModel(String uri)

Remove a named graph.

replaceNamedModel

void replaceNamedModel(String uri,
                     Model model)

Change a named graph for another using the same name

listNames

Iterator<String> listNames()

List the names

getLock

Lock getLock()

Get the lock for this dataset

getContext

Context getContext()

Get the context associated with this dataset

supportsTransactions

boolean supportsTransactions()

Does this dataset support transactions? Supporting transactions mean that the dataset implementation provides begin(com.hp.hpl.jena.query.ReadWrite), commit(), abort(), end() which otherwise may throw UnsupportedOperationException

begin

void begin(ReadWrite readWrite)

Start either a READ or WRITE transaction

commit

void commit()

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

abort

void abort()

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

isInTransaction

boolean isInTransaction()

Say whether a transaction is active

end

void end()

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

asDatasetGraph

DatasetGraph asDatasetGraph()

Get the dataset in graph form

close

void close()

Close the dataset, potentially releasing any associated resources. The dataset can not be used for query after this call.