org.eclipse.rdf4j.repository

Interface RepositoryConnection

All Superinterfaces:

AutoCloseable

All Known Subinterfaces:

DelegatingRepositoryConnection, InterceptingRepositoryConnection, NotifyingRepositoryConnection

All Known Implementing Classes:

AbstractRepositoryConnection, ContextAwareConnection, DatasetRepositoryConnection, EndpointBase.ManagedRepositoryConnection, FedXRepositoryConnection, InterceptingRepositoryConnectionWrapper, NotifyingRepositoryConnectionWrapper, RepositoryConnectionBase, RepositoryConnectionWrapper, SailRepositoryConnection, SPARQLConnection

public interface RepositoryConnection
extends AutoCloseable

Main interface for updating data in and performing queries on an RDF4J Repository. By default, a RepositoryConnection is in auto-commit mode, meaning that each operation corresponds to a single transaction on the underlying store. Multiple operations can be bundled in a single transaction by using begin() and commit/ rollback. Care should be taking to always properly close a RepositoryConnection after one is finished with it, to free up resources and avoid unnecessary locks.

RepositoryConnection is not guaranteed to be thread-safe. The recommended access pattern in a multithreaded application is to ensure that each thread creates/uses its own RepositoryConnections (which can be obtained from a shared Repository).

Several methods take a vararg argument that optionally specifies one or more contexts (named graphs) on which the method should operate. A vararg parameter is optional, it can be completely left out of the method call, in which case a method either operates on a provided statements context (if one of the method parameters is a statement or collection of statements), or operates on the repository as a whole, completely ignoring context. A vararg argument may also be 'null' (cast to Resource) meaning that the method operates on those statements which have no associated context only.

Examples:

 
 // Ex 1: this method retrieves all statements that appear in either context1 or
 // context2, or both.
 RepositoryConnection.getStatements(null, null, null, true, context1, context2);

 // Ex 2: this method retrieves all statements that appear in the repository
 // (regardless of context).
 RepositoryConnection.getStatements(null, null, null, true);

 // Ex 3: this method retrieves all statements that have no associated context in
 // the repository.
 // Observe that this is not equivalent to the previous method call.
 RepositoryConnection.getStatements(null, null, null, true, (Resource)null);

 // Ex 4: this method adds a statement to the store. If the statement object
 // itself has a context (i.e. statement.getContext() != null) the statement is added
 // to that context. Otherwise, it is added without any associated context.
 RepositoryConnection.add(statement);

 // Ex 5: this method adds a statement to context1 in the store. It completely
 // ignores any context the statement itself has.
 RepositoryConnection.add(statement, context1);
 
 

Author:

Arjohn Kampman, Jeen Broekstra

See Also:

Repositories

Method Summary

Modifier and Type	Method and Description
void	add(File file, String baseURI, RDFFormat dataFormat, Resource... contexts) Adds RDF data from the specified file to a specific contexts in the repository.
void	add(InputStream in, String baseURI, RDFFormat dataFormat, Resource... contexts) Adds RDF data from an InputStream to the repository, optionally to one or more named contexts.
void	add(Iterable<? extends Statement> statements, Resource... contexts) Adds the supplied statements to this repository, optionally to one or more named contexts.
<E extends Exception> void	add(Iteration<? extends Statement,E> statements, Resource... contexts) Adds the supplied statements to this repository, optionally to one or more named contexts.
void	add(Reader reader, String baseURI, RDFFormat dataFormat, Resource... contexts) Adds RDF data from a Reader to the repository, optionally to one or more named contexts.
default void	add(RepositoryResult<Statement> statements, Resource... contexts) Adds the supplied statements to this repository, optionally to one or more named contexts.
void	add(Resource subject, IRI predicate, Value object, Resource... contexts) Adds a statement with the specified subject, predicate and object to this repository, optionally to one or more named contexts.
default void	add(Resource subject, URI predicate, Value object, Resource... contexts) Deprecated. since 2.0. Use add(Resource, IRI, Value, Resource...) instead.
void	add(Statement st, Resource... contexts) Adds the supplied statement to this repository, optionally to one or more named contexts.
void	add(URL url, String baseURI, RDFFormat dataFormat, Resource... contexts) Adds the RDF data that can be found at the specified URL to the repository, optionally to one or more named contexts.
void	begin() Begins a new transaction, requiring commit() or rollback() to be called to end the transaction.
void	begin(IsolationLevel level) Begins a new transaction with the supplied IsolationLevel, requiring commit() or rollback() to be called to end the transaction.
default void	begin(TransactionSetting... settings) Begins a new transaction with the supplied TransactionSetting, requiring commit() or rollback() to be called to end the transaction.
void	clear(Resource... contexts) Removes all statements from a specific contexts in the repository.
void	clearNamespaces() Removes all namespace declarations from the repository.
default void	close() Closes the connection, freeing resources.
void	commit() Commits the active transaction.
void	export(RDFHandler handler, Resource... contexts) Exports all explicit statements in the specified contexts to the supplied RDFHandler.
void	exportStatements(Resource subj, IRI pred, Value obj, boolean includeInferred, RDFHandler handler, Resource... contexts) Exports all statements with a specific subject, predicate and/or object from the repository, optionally from the specified contexts.
RepositoryResult<Resource>	getContextIDs() Gets all resources that are used as content identifiers.
IsolationLevel	getIsolationLevel() Retrieves the current transaction isolation level of the connection.
String	getNamespace(String prefix) Gets the namespace that is associated with the specified prefix, if any.
RepositoryResult<Namespace>	getNamespaces() Gets all declared namespaces as a RepositoryResult of Namespace objects.
ParserConfig	getParserConfig() Returns the parser configuration this connection uses for Rio-based operations.
Repository	getRepository() Returns the Repository object to which this connection belongs.
RepositoryResult<Statement>	getStatements(Resource subj, IRI pred, Value obj, boolean includeInferred, Resource... contexts) Gets all statements with a specific subject, predicate and/or object from the repository.
default RepositoryResult<Statement>	getStatements(Resource subj, IRI pred, Value obj, Resource... contexts) Gets all statements with a specific subject, predicate and/or object from the repository.
default RepositoryResult<Statement>	getStatements(Resource subj, URI pred, Value obj, boolean includeInferred, Resource... contexts) Deprecated. since 2.0. Use getStatements(Resource, IRI, Value, boolean, Resource...) instead.
ValueFactory	getValueFactory() Gets a ValueFactory for this RepositoryConnection.
boolean	hasStatement(Resource subj, IRI pred, Value obj, boolean includeInferred, Resource... contexts) Checks whether the repository contains statements with a specific subject, predicate and/or object, optionally in the specified contexts.
default boolean	hasStatement(Resource subj, URI pred, Value obj, boolean includeInferred, Resource... contexts) Deprecated. since 2.0. Use hasStatement(Resource, IRI, Value, boolean, Resource...) instead.
boolean	hasStatement(Statement st, boolean includeInferred, Resource... contexts) Checks whether the repository contains the specified statement, optionally in the specified contexts.
boolean	isActive() Indicates if a transaction is currently active on the connection.
boolean	isAutoCommit() Deprecated. since 2.0. Use isActive() instead.
boolean	isEmpty() Returns true if this repository does not contain any (explicit) statements.
boolean	isOpen() Checks whether this connection is open.
BooleanQuery	prepareBooleanQuery(QueryLanguage ql, String query) Prepares queries that return true or false.
BooleanQuery	prepareBooleanQuery(QueryLanguage ql, String query, String baseURI) Prepares queries that return true or false.
default BooleanQuery	prepareBooleanQuery(String query) Prepares SPARQL queries that return true or false, that is, SPARQL ASK queries.
GraphQuery	prepareGraphQuery(QueryLanguage ql, String query) Prepares queries that produce RDF graphs.
GraphQuery	prepareGraphQuery(QueryLanguage ql, String query, String baseURI) Prepares queries that produce RDF graphs.
default GraphQuery	prepareGraphQuery(String query) Prepares SPARQL queries that produce RDF graphs, that is, SPARQL CONSTRUCT or DESCRIBE queries.
Query	prepareQuery(QueryLanguage ql, String query) Prepares a query for evaluation on this repository (optional operation).
Query	prepareQuery(QueryLanguage ql, String query, String baseURI) Prepares a query for evaluation on this repository (optional operation).
default Query	prepareQuery(String query) Prepares a SPARQL query for evaluation on this repository (optional operation).
TupleQuery	prepareTupleQuery(QueryLanguage ql, String query) Prepares a query that produces sets of value tuples.
TupleQuery	prepareTupleQuery(QueryLanguage ql, String query, String baseURI) Prepares a query that produces sets of value tuples.
default TupleQuery	prepareTupleQuery(String query) Prepares a SPARQL query that produces sets of value tuples, that is a SPARQL SELECT query.
Update	prepareUpdate(QueryLanguage ql, String update) Prepares an Update operation.
Update	prepareUpdate(QueryLanguage ql, String update, String baseURI) Prepares an Update operation.
default Update	prepareUpdate(String update) Prepares a SPARQL Update operation.
void	remove(Iterable<? extends Statement> statements, Resource... contexts) Removes the supplied statements from the specified contexts in this repository.
<E extends Exception> void	remove(Iteration<? extends Statement,E> statements, Resource... contexts) Removes the supplied statements from a specific context in this repository, ignoring any context information carried by the statements themselves.
default void	remove(RepositoryResult<Statement> statements, Resource... contexts) Removes the supplied statements from a specific context in this repository, ignoring any context information carried by the statements themselves.
void	remove(Resource subject, IRI predicate, Value object, Resource... contexts) Removes the statement(s) with the specified subject, predicate and object from the repository, optionally restricted to the specified contexts.
default void	remove(Resource subject, URI predicate, Value object, Resource... contexts) Deprecated. since 2.0. Use remove(Resource, IRI, Value, Resource...) instead.
void	remove(Statement st, Resource... contexts) Removes the supplied statement from the specified contexts in the repository.
void	removeNamespace(String prefix) Removes a namespace declaration by removing the association between a prefix and a namespace name.
void	rollback() Rolls back all updates in the active transaction.
void	setAutoCommit(boolean autoCommit) Deprecated. As of release 2.7.0, use begin() instead.
void	setIsolationLevel(IsolationLevel level) Sets the transaction isolation level for the next transaction(s) on this connection.
void	setNamespace(String prefix, String name) Sets the prefix for a namespace.
void	setParserConfig(ParserConfig config) Set the parser configuration this connection should use for RDFParser-based operations.
long	size(Resource... contexts) Returns the number of (explicit) statements that are in the specified contexts in this repository.

Method Detail

getRepository

Repository getRepository()

Returns the Repository object to which this connection belongs.

setParserConfig

void setParserConfig(ParserConfig config)

Set the parser configuration this connection should use for RDFParser-based operations.

Parameters:

config - a Rio RDF Parser configuration.

getParserConfig

ParserConfig getParserConfig()

Returns the parser configuration this connection uses for Rio-based operations.

Returns:

a Rio RDF parser configuration.

getValueFactory

ValueFactory getValueFactory()

Gets a ValueFactory for this RepositoryConnection.

Returns:

A repository-specific ValueFactory.

isOpen

boolean isOpen()
        throws RepositoryException

Checks whether this connection is open. A connection is open from the moment it is created until it is closed.

Throws:

RepositoryException

See Also:

close()

close

default void close()
            throws RepositoryException

Closes the connection, freeing resources. If a transaction is active on the connection, all non-committed operations will be lost by actively calling rollback() on any active transactions.

Implementation note: All implementations must override this method if they have any resources that they need to free.

Specified by:

close in interface AutoCloseable

Throws:

RepositoryException - If the connection could not be closed.

prepareQuery

default Query prepareQuery(String query)
                    throws RepositoryException,
                           MalformedQueryException

Prepares a SPARQL query for evaluation on this repository (optional operation). In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareQuery(QueryLanguage, String, String) instead.

If you already know the type of query, using the more specific prepareTupleQuery(java.lang.String), prepareGraphQuery(java.lang.String) or prepareBooleanQuery(java.lang.String) is likely to be more efficient.

Parameters:

query - The query string, in SPARQL syntax.

Returns:

A query ready to be evaluated on this repository.

Throws:

MalformedQueryException - If the supplied query is malformed.

UnsupportedOperationException - If the prepareQuery method is not supported by this repository.

RepositoryException

See Also:

prepareQuery(QueryLanguage, String)

prepareQuery

Query prepareQuery(QueryLanguage ql,
                   String query)
            throws RepositoryException,
                   MalformedQueryException

Prepares a query for evaluation on this repository (optional operation). In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareQuery(QueryLanguage, String, String) instead.

If you already know the type of query, using the more specific prepareTupleQuery(java.lang.String), prepareGraphQuery(java.lang.String) or prepareBooleanQuery(java.lang.String) is likely to be more efficient.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

Returns:

A query ready to be evaluated on this repository.

Throws:

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

UnsupportedOperationException - If the prepareQuery method is not supported by this repository.

RepositoryException

prepareQuery

Query prepareQuery(QueryLanguage ql,
                   String query,
                   String baseURI)
            throws RepositoryException,
                   MalformedQueryException

Prepares a query for evaluation on this repository (optional operation).

If you already know the type of query, using the more specific prepareTupleQuery(java.lang.String), prepareGraphQuery(java.lang.String) or prepareBooleanQuery(java.lang.String) is likely to be more efficient.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

baseURI - The base URI to resolve any relative URIs that are in the query against, can be null if the query does not contain any relative URIs.

Returns:

A query ready to be evaluated on this repository.

Throws:

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

UnsupportedOperationException - If the prepareQuery method is not supported by this repository.

RepositoryException

prepareTupleQuery

default TupleQuery prepareTupleQuery(String query)
                              throws RepositoryException,
                                     MalformedQueryException

Prepares a SPARQL query that produces sets of value tuples, that is a SPARQL SELECT query. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareTupleQuery(QueryLanguage, String, String) instead.

Parameters:

query - The query string, in SPARQL syntax.

Returns:

a TupleQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a tuple query.

MalformedQueryException - If the supplied query is malformed.

RepositoryException

See Also:

prepareTupleQuery(QueryLanguage, String)

prepareTupleQuery

TupleQuery prepareTupleQuery(QueryLanguage ql,
                             String query)
                      throws RepositoryException,
                             MalformedQueryException

Prepares a query that produces sets of value tuples. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareTupleQuery(QueryLanguage, String, String) instead.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

Returns:

a TupleQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a tuple query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareTupleQuery

TupleQuery prepareTupleQuery(QueryLanguage ql,
                             String query,
                             String baseURI)
                      throws RepositoryException,
                             MalformedQueryException

Prepares a query that produces sets of value tuples.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

baseURI - The base URI to resolve any relative URIs that are in the query against, can be null if the query does not contain any relative URIs.

Returns:

a TupleQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a tuple query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareGraphQuery

default GraphQuery prepareGraphQuery(String query)
                              throws RepositoryException,
                                     MalformedQueryException

Prepares SPARQL queries that produce RDF graphs, that is, SPARQL CONSTRUCT or DESCRIBE queries. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareGraphQuery(QueryLanguage, String, String) instead.

Parameters:

query - The query string, in SPARQL syntax.

Returns:

a GraphQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a graph query.

MalformedQueryException - If the supplied query is malformed.

RepositoryException

See Also:

prepareGraphQuery(QueryLanguage, String)

prepareGraphQuery

GraphQuery prepareGraphQuery(QueryLanguage ql,
                             String query)
                      throws RepositoryException,
                             MalformedQueryException

Prepares queries that produce RDF graphs. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareGraphQuery(QueryLanguage, String, String) instead.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

Returns:

a GraphQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a graph query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareGraphQuery

GraphQuery prepareGraphQuery(QueryLanguage ql,
                             String query,
                             String baseURI)
                      throws RepositoryException,
                             MalformedQueryException

Prepares queries that produce RDF graphs.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

baseURI - The base URI to resolve any relative URIs that are in the query against, can be null if the query does not contain any relative URIs.

Returns:

a GraphQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a graph query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareBooleanQuery

default BooleanQuery prepareBooleanQuery(String query)
                                  throws RepositoryException,
                                         MalformedQueryException

Prepares SPARQL queries that return true or false, that is, SPARQL ASK queries. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareBooleanQuery(QueryLanguage, String, String) instead.

Parameters:

query - The query string, in SPARQL syntax.

Returns:

a BooleanQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a boolean query.

MalformedQueryException - If the supplied SPARQL query is malformed.

RepositoryException

See Also:

prepareBooleanQuery(QueryLanguage, String)

prepareBooleanQuery

BooleanQuery prepareBooleanQuery(QueryLanguage ql,
                                 String query)
                          throws RepositoryException,
                                 MalformedQueryException

Prepares queries that return true or false. In case the query contains relative URIs that need to be resolved against an external base URI, one should use prepareBooleanQuery(QueryLanguage, String, String) instead.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

Returns:

a BooleanQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a boolean query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareBooleanQuery

BooleanQuery prepareBooleanQuery(QueryLanguage ql,
                                 String query,
                                 String baseURI)
                          throws RepositoryException,
                                 MalformedQueryException

Prepares queries that return true or false.

Parameters:

ql - The query language in which the query is formulated.

query - The query string.

baseURI - The base URI to resolve any relative URIs that are in the query against, can be null if the query does not contain any relative URIs.

Returns:

a BooleanQuery ready to be evaluated on this RepositoryConnection.

Throws:

IllegalArgumentException - If the supplied query is not a boolean query.

MalformedQueryException - If the supplied query is malformed.

UnsupportedQueryLanguageException - If the supplied query language is not supported.

RepositoryException

prepareUpdate

default Update prepareUpdate(String update)
                      throws RepositoryException,
                             MalformedQueryException

Prepares a SPARQL Update operation. In case the update string contains relative URIs that need to be resolved against an external base URI, one should use prepareUpdate(QueryLanguage, String, String) instead.

Parameters:

update - The update operation string, in SPARQL syntax.

Returns:

a Update ready to be executed on this RepositoryConnection.

Throws:

MalformedQueryException - If the supplied update operation string is malformed.

RepositoryException

See Also:

prepareUpdate(QueryLanguage, String)

prepareUpdate

Update prepareUpdate(QueryLanguage ql,
                     String update)
              throws RepositoryException,
                     MalformedQueryException

Prepares an Update operation. In case the update string contains relative URIs that need to be resolved against an external base URI, one should use prepareUpdate(QueryLanguage, String, String) instead.

Parameters:

ql - The query language in which the update operation is formulated.

update - The update operation string.

Returns:

a Update ready to be executed on this RepositoryConnection.

Throws:

MalformedQueryException - If the supplied update operation string is malformed.

RepositoryException

prepareUpdate

Update prepareUpdate(QueryLanguage ql,
                     String update,
                     String baseURI)
              throws RepositoryException,
                     MalformedQueryException

Prepares an Update operation.

Parameters:

ql - The query language in which the update operation is formulated.

update - The update operation string.

baseURI - The base URI to resolve any relative URIs that are in the update against, can be null if the update does not contain any relative URIs.

Returns:

a Update ready to be executed on this RepositoryConnection.

Throws:

MalformedQueryException - If the supplied update operation string is malformed.

RepositoryException

getContextIDs

RepositoryResult<Resource> getContextIDs()
                                  throws RepositoryException

Gets all resources that are used as content identifiers. Care should be taken that the returned RepositoryResult is closed to free any resources that it keeps hold of.

Returns:

a RepositoryResult object containing Resources that are used as context identifiers.

Throws:

RepositoryException

getStatements

default RepositoryResult<Statement> getStatements(Resource subj,
                                                  IRI pred,
                                                  Value obj,
                                                  Resource... contexts)
                                           throws RepositoryException

Gets all statements with a specific subject, predicate and/or object from the repository. The result is optionally restricted to the specified set of named contexts. If the repository supports inferencing, inferred statements will be included in the result.

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - A URI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

Returns:

The statements matching the specified pattern. The result object is a RepositoryResult object, a lazy Iterator-like object containing Statements and optionally throwing a RepositoryException when an error when a problem occurs during retrieval.

Throws:

RepositoryException

getStatements

@Deprecated
default RepositoryResult<Statement> getStatements(Resource subj,
                                                              URI pred,
                                                              Value obj,
                                                              boolean includeInferred,
                                                              Resource... contexts)
                                                       throws RepositoryException

Deprecated. since 2.0. Use getStatements(Resource, IRI, Value, boolean, Resource...) instead.

Gets all statements with a specific subject, predicate and/or object from the repository. The result is optionally restricted to the specified set of named contexts.

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - A URI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

includeInferred - if false, no inferred statements are returned; if true, inferred statements are returned if available. The default is true.

Returns:

The statements matching the specified pattern. The result object is a RepositoryResult object, a lazy Iterator-like object containing Statements and optionally throwing a RepositoryException when an error when a problem occurs during retrieval.

Throws:

RepositoryException

getStatements

RepositoryResult<Statement> getStatements(Resource subj,
                                          IRI pred,
                                          Value obj,
                                          boolean includeInferred,
                                          Resource... contexts)
                                   throws RepositoryException

Gets all statements with a specific subject, predicate and/or object from the repository. The result is optionally restricted to the specified set of named contexts.

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - An IRI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

includeInferred - if false, no inferred statements are returned; if true, inferred statements are returned if available. The default is true.

Returns:

The statements matching the specified pattern. The result object is a RepositoryResult object, a lazy Iterator-like object containing Statements and optionally throwing a RepositoryException when an error when a problem occurs during retrieval.

Throws:

RepositoryException

hasStatement

boolean hasStatement(Resource subj,
                     IRI pred,
                     Value obj,
                     boolean includeInferred,
                     Resource... contexts)
              throws RepositoryException

Checks whether the repository contains statements with a specific subject, predicate and/or object, optionally in the specified contexts.

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - An IRI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

contexts - The context(s) the need to be searched. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

includeInferred - if false, no inferred statements are considered; if true, inferred statements are considered if available

Returns:

true If a matching statement is in the repository in the specified context, false otherwise.

Throws:

RepositoryException

hasStatement

@Deprecated
default boolean hasStatement(Resource subj,
                                         URI pred,
                                         Value obj,
                                         boolean includeInferred,
                                         Resource... contexts)
                                  throws RepositoryException

Deprecated. since 2.0. Use hasStatement(Resource, IRI, Value, boolean, Resource...) instead.

Checks whether the repository contains statements with a specific subject, predicate and/or object, optionally in the specified contexts.

Parameters:

subj - A Resource specifying the subject, or null for a wildcard.

pred - A URI specifying the predicate, or null for a wildcard.

obj - A Value specifying the object, or null for a wildcard.

contexts - The context(s) the need to be searched. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

includeInferred - if false, no inferred statements are considered; if true, inferred statements are considered if available

Returns:

true If a matching statement is in the repository in the specified context, false otherwise.

Throws:

RepositoryException

hasStatement

boolean hasStatement(Statement st,
                     boolean includeInferred,
                     Resource... contexts)
              throws RepositoryException

Checks whether the repository contains the specified statement, optionally in the specified contexts.

Parameters:

st - The statement to look for. Context information in the statement is ignored.

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

includeInferred - if false, no inferred statements are considered; if true, inferred statements are considered if available

Returns:

true If the repository contains the specified statement, false otherwise.

Throws:

RepositoryException

exportStatements

void exportStatements(Resource subj,
                      IRI pred,
                      Value obj,
                      boolean includeInferred,
                      RDFHandler handler,
                      Resource... contexts)
               throws RepositoryException,
                      RDFHandlerException

Exports all statements with a specific subject, predicate and/or object from the repository, optionally from the specified contexts. This method supplies the RDFHandler with all namespace declarations available in the repository.

Parameters:

subj - The subject, or null if the subject doesn't matter.

pred - The predicate, or null if the predicate doesn't matter.

obj - The object, or null if the object doesn't matter.

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

handler - The handler that will handle the RDF data.

includeInferred - if false, no inferred statements are returned; if true, inferred statements are returned if available

Throws:

RDFHandlerException - If the handler encounters an unrecoverable error.

RepositoryException

export

void export(RDFHandler handler,
            Resource... contexts)
     throws RepositoryException,
            RDFHandlerException

Exports all explicit statements in the specified contexts to the supplied RDFHandler. This method supplies the RDFHandler with all namespace declarations available in the repository.

Parameters:

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

handler - The handler that will handle the RDF data.

Throws:

RDFHandlerException - If the handler encounters an unrecoverable error.

RepositoryException

size

long size(Resource... contexts)
   throws RepositoryException

Returns the number of (explicit) statements that are in the specified contexts in this repository.

Parameters:

contexts - The context(s) to get the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

Returns:

The number of explicit statements from the specified contexts in this repository.

Throws:

RepositoryException

isEmpty

boolean isEmpty()
         throws RepositoryException

Returns true if this repository does not contain any (explicit) statements.

Returns:

true if this repository is empty, false otherwise.

Throws:

RepositoryException - If the repository could not be checked to be empty.

setAutoCommit

@Deprecated
void setAutoCommit(boolean autoCommit)
                        throws RepositoryException

Deprecated. As of release 2.7.0, use begin() instead.

Enables or disables auto-commit mode for the connection. If a connection is in auto-commit mode, then all updates will be executed and committed as individual transactions. Otherwise, the updates are grouped into transactions that are terminated by a call to either commit() or rollback(). By default, new connections are in auto-commit mode.

NOTE: If this connection is switched to auto-commit mode during a transaction, the transaction is committed.

Throws:

RepositoryException - In case the mode switch failed, for example because a currently active transaction failed to commit.

See Also:

commit()

isAutoCommit

@Deprecated
boolean isAutoCommit()
                          throws RepositoryException

Deprecated. since 2.0. Use isActive() instead.

Indicates if the connection is in auto-commit mode. The connection is in auto-commit mode when no transaction is currently active, that is, when:

1. begin() has not been called or;
2. commit() or rollback() have been called to finish the transaction.

Throws:

RepositoryException - If a repository access error occurs.

isActive

boolean isActive()
          throws UnknownTransactionStateException,
                 RepositoryException

Indicates if a transaction is currently active on the connection. A transaction is active if begin() has been called, and becomes inactive after commit() or rollback() has been called.

Returns:

true iff a transaction is active, false iff no transaction is active.

Throws:

UnknownTransactionStateException - if the transaction state can not be determined. This can happen for instance when communication with a repository fails or times out.

RepositoryException

setIsolationLevel

void setIsolationLevel(IsolationLevel level)
                throws IllegalStateException

Sets the transaction isolation level for the next transaction(s) on this connection. If the level is set to a value that is not supported by the underlying repository, this method will still succeed but a subsequent call to begin() will result in an exception.

Parameters:

level - the transaction isolation level to set.

Throws:

IllegalStateException - if the method is called while a transaction is already active.

getIsolationLevel

IsolationLevel getIsolationLevel()

Retrieves the current transaction isolation level of the connection.

Returns:

the current transaction isolation level.

begin

void begin()
    throws RepositoryException

Begins a new transaction, requiring commit() or rollback() to be called to end the transaction. The transaction will use the currently set isolation level for this connection.

Throws:

RepositoryException - If the connection could not start the transaction. One possible reason this may happen is if a transaction is already active on the current connection.

See Also:

begin(IsolationLevel), isActive(), commit(), rollback(), setIsolationLevel(IsolationLevel)

begin

void begin(IsolationLevel level)
    throws RepositoryException

Begins a new transaction with the supplied IsolationLevel, requiring commit() or rollback() to be called to end the transaction.

Parameters:

level - The IsolationLevel at which this transaction will operate. If set to null the default isolation level of the underlying store will be used. If the specified isolation level is not supported by the underlying store, it will attempt to use a supported compatible level instead.

Throws:

RepositoryException - If the connection could not start the transaction. Possible reasons this may happen are:

• a transaction is already active on the current connection.
• the specified IsolationLevel is not supported by the store, and no compatible level could be found.

See Also:

begin(), isActive(), commit(), rollback(), setIsolationLevel(IsolationLevel)

begin

default void begin(TransactionSetting... settings)

Begins a new transaction with the supplied TransactionSetting, requiring commit() or rollback() to be called to end the transaction.

Parameters:

settings - The TransactionSetting (zero or more) for this transaction. If an isolation level is provided in the settings this will be used for the transaction. If none is provided then the default will be used. Behaviour of this method is undefined if more than one isolation level is provided. Behaviour of this method is undefined if one or more settings is null.

Throws:

RepositoryException - If the connection could not start the transaction. Possible reasons this may happen are:

• a transaction is already active on the current connection.
• the specified IsolationLevel is not supported by the store, and no compatible level could be found.

Since:

3.3.0

See Also:

begin(), isActive(), commit(), rollback(), setIsolationLevel(IsolationLevel)

commit

void commit()
     throws RepositoryException

Commits the active transaction. This operation ends the active transaction.

Throws:

UnknownTransactionStateException - if the transaction state can not be determined. This can happen for instance when communication with a repository fails or times out.

RepositoryException - If the connection could not be committed, or if the connection does not have an active transaction.

See Also:

isActive(), begin(), rollback()

rollback

void rollback()
       throws RepositoryException

Rolls back all updates in the active transaction. This operation ends the active transaction.

Throws:

UnknownTransactionStateException - if the transaction state can not be determined. This can happen for instance when communication with a repository fails or times out.

RepositoryException - If the transaction could not be rolled back, or if the connection does not have an active transaction.

See Also:

isActive(), begin(), commit()

add

void add(InputStream in,
         String baseURI,
         RDFFormat dataFormat,
         Resource... contexts)
  throws IOException,
         RDFParseException,
         RepositoryException

Adds RDF data from an InputStream to the repository, optionally to one or more named contexts.

Parameters:

in - An InputStream from which RDF data can be read.

baseURI - The base URI to resolve any relative URIs that are in the data against.

dataFormat - The serialization format of the data.

contexts - The contexts to add the data to. If one or more contexts are supplied the method ignores contextual information in the actual data. If no contexts are supplied the contextual information in the input stream is used, if no context information is available the data is added without any context.

Throws:

IOException - If an I/O error occurred while reading from the input stream.

UnsupportedRDFormatException - If no parser is available for the specified RDF format.

RDFParseException - If an error was found while parsing the RDF data.

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

void add(Reader reader,
         String baseURI,
         RDFFormat dataFormat,
         Resource... contexts)
  throws IOException,
         RDFParseException,
         RepositoryException

Adds RDF data from a Reader to the repository, optionally to one or more named contexts. Note: using a Reader to upload byte-based data means that you have to be careful not to destroy the data's character encoding by enforcing a default character encoding upon the bytes. If possible, adding such data using an InputStream is to be preferred.

Parameters:

reader - A Reader from which RDF data can be read.

baseURI - The base URI to resolve any relative URIs that are in the data against.

dataFormat - The serialization format of the data.

contexts - The contexts to add the data to. If one or more contexts are specified the data is added to these contexts, ignoring any context information in the data itself.

Throws:

IOException - If an I/O error occurred while reading from the reader.

UnsupportedRDFormatException - If no parser is available for the specified RDF format.

RDFParseException - If an error was found while parsing the RDF data.

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

void add(URL url,
         String baseURI,
         RDFFormat dataFormat,
         Resource... contexts)
  throws IOException,
         RDFParseException,
         RepositoryException

Adds the RDF data that can be found at the specified URL to the repository, optionally to one or more named contexts.

Parameters:

url - The URL of the RDF data.

baseURI - The base URI to resolve any relative URIs that are in the data against. This defaults to the value of url.toExternalForm() if the value is set to null.

dataFormat - The serialization format of the data. If set to null, the format will be automatically determined by examining the content type in the HTTP response header, and failing that, the file name extension of the supplied URL.

contexts - The contexts to add the data to. If one or more contexts are specified the data is added to these contexts, ignoring any context information in the data itself.

Throws:

IOException - If an I/O error occurred while reading from the URL.

UnsupportedRDFormatException - If no parser is available for the specified RDF format, or the RDF format could not be automatically determined.

RDFParseException - If an error was found while parsing the RDF data.

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

void add(File file,
         String baseURI,
         RDFFormat dataFormat,
         Resource... contexts)
  throws IOException,
         RDFParseException,
         RepositoryException

Adds RDF data from the specified file to a specific contexts in the repository.

Parameters:

file - A file containing RDF data.

baseURI - The base URI to resolve any relative URIs that are in the data against. This defaults to the value of file.toURI() if the value is set to null.

dataFormat - The serialization format of the data.

contexts - The contexts to add the data to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, the data is added to any context specified in the actual data file, or if the data contains no context, it is added without context. If one or more contexts are specified the data is added to these contexts, ignoring any context information in the data itself.

Throws:

IOException - If an I/O error occurred while reading from the file.

UnsupportedRDFormatException - If no parser is available for the specified RDF format.

RDFParseException - If an error was found while parsing the RDF data.

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

void add(Resource subject,
         IRI predicate,
         Value object,
         Resource... contexts)
  throws RepositoryException

Adds a statement with the specified subject, predicate and object to this repository, optionally to one or more named contexts.

Parameters:

subject - The statement's subject.

predicate - The statement's predicate.

object - The statement's object.

contexts - The contexts to add the data to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, the data is added to any context specified in the actual data file, or if the data contains no context, it is added without context. If one or more contexts are specified the data is added to these contexts, ignoring any context information in the data itself.

Throws:

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

@Deprecated
default void add(Resource subject,
                             URI predicate,
                             Value object,
                             Resource... contexts)
                      throws RepositoryException

Deprecated. since 2.0. Use add(Resource, IRI, Value, Resource...) instead.

Adds a statement with the specified subject, predicate and object to this repository, optionally to one or more named contexts.

Parameters:

subject - The statement's subject.

predicate - The statement's predicate.

object - The statement's object.

contexts - The contexts to add the data to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, the data is added to any context specified in the actual data file, or if the data contains no context, it is added without context. If one or more contexts are specified the data is added to these contexts, ignoring any context information in the data itself.

Throws:

RepositoryException - If the data could not be added to the repository, for example because the repository is not writable.

add

void add(Statement st,
         Resource... contexts)
  throws RepositoryException

Adds the supplied statement to this repository, optionally to one or more named contexts.

Parameters:

st - The statement to add.

contexts - The contexts to add the statements to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, the statement is added to any context specified in each statement, or if the statement contains no context, it is added without context. If one or more contexts are specified the statement is added to these contexts, ignoring any context information in the statement itself.

Throws:

RepositoryException - If the statement could not be added to the repository, for example because the repository is not writable.

add

void add(Iterable<? extends Statement> statements,
         Resource... contexts)
  throws RepositoryException

Adds the supplied statements to this repository, optionally to one or more named contexts.

Parameters:

statements - The statements that should be added.

contexts - The contexts to add the statements to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, each statement is added to any context specified in the statement, or if the statement contains no context, it is added without context. If one or more contexts are specified each statement is added to these contexts, ignoring any context information in the statement itself. ignored.

Throws:

RepositoryException - If the statements could not be added to the repository, for example because the repository is not writable.

add

<E extends Exception> void add(Iteration<? extends Statement,E> statements,
                               Resource... contexts)
                        throws RepositoryException,
                               E extends Exception

Adds the supplied statements to this repository, optionally to one or more named contexts.

Parameters:

statements - The statements to add. In case the iteration is a CloseableIteration, it will be closed before this method returns.

contexts - The contexts to add the statements to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, each statement is added to any context specified in the statement, or if the statement contains no context, it is added without context. If one or more contexts are specified each statement is added to these contexts, ignoring any context information in the statement itself. ignored.

Throws:

RepositoryException - If the statements could not be added to the repository, for example because the repository is not writable.

E extends Exception

add

default void add(RepositoryResult<Statement> statements,
                 Resource... contexts)
          throws RepositoryException

Adds the supplied statements to this repository, optionally to one or more named contexts.

Parameters:

statements - The statements to add. The @{link RepositoryResult} will be closed before this method returns.

contexts - The contexts to add the statements to. Note that this parameter is a vararg and as such is optional. If no contexts are specified, each statement is added to any context specified in the statement, or if the statement contains no context, it is added without context. If one or more contexts are specified each statement is added to these contexts, ignoring any context information in the statement itself. ignored.

Throws:

RepositoryException - If the statements could not be added to the repository, for example because the repository is not writable.

remove

void remove(Resource subject,
            IRI predicate,
            Value object,
            Resource... contexts)
     throws RepositoryException

Removes the statement(s) with the specified subject, predicate and object from the repository, optionally restricted to the specified contexts.

Parameters:

subject - The statement's subject, or null for a wildcard.

predicate - The statement's predicate, or null for a wildcard.

object - The statement's object, or null for a wildcard.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

Throws:

RepositoryException - If the statement(s) could not be removed from the repository, for example because the repository is not writable.

remove

@Deprecated
default void remove(Resource subject,
                                URI predicate,
                                Value object,
                                Resource... contexts)
                         throws RepositoryException

Deprecated. since 2.0. Use remove(Resource, IRI, Value, Resource...) instead.

Removes the statement(s) with the specified subject, predicate and object from the repository, optionally restricted to the specified contexts.

Parameters:

subject - The statement's subject, or null for a wildcard.

predicate - The statement's predicate, or null for a wildcard.

object - The statement's object, or null for a wildcard.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

Throws:

RepositoryException - If the statement(s) could not be removed from the repository, for example because the repository is not writable.

remove

void remove(Statement st,
            Resource... contexts)
     throws RepositoryException

Removes the supplied statement from the specified contexts in the repository.

Parameters:

st - The statement to remove.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the contexts associated with the statement itself, and if no context is associated with the statement, on the entire repository.

Throws:

RepositoryException - If the statement could not be removed from the repository, for example because the repository is not writable.

remove

void remove(Iterable<? extends Statement> statements,
            Resource... contexts)
     throws RepositoryException

Removes the supplied statements from the specified contexts in this repository.

Parameters:

statements - The statements that should be added.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the contexts associated with the statement itself, and if no context is associated with the statement, on the entire repository.

Throws:

RepositoryException - If the statements could not be added to the repository, for example because the repository is not writable.

remove

<E extends Exception> void remove(Iteration<? extends Statement,E> statements,
                                  Resource... contexts)
                           throws RepositoryException,
                                  E extends Exception

Removes the supplied statements from a specific context in this repository, ignoring any context information carried by the statements themselves.

Parameters:

statements - The statements to remove. In case the iteration is a CloseableIteration, it will be closed before this method returns.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the contexts associated with the statement itself, and if no context is associated with the statement, on the entire repository.

Throws:

RepositoryException - If the statements could not be removed from the repository, for example because the repository is not writable.

E extends Exception

remove

default void remove(RepositoryResult<Statement> statements,
                    Resource... contexts)
             throws RepositoryException

Removes the supplied statements from a specific context in this repository, ignoring any context information carried by the statements themselves.

Parameters:

statements - The statements to remove. The RepositoryResult will be closed before this method returns.

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the contexts associated with the statement itself, and if no context is associated with the statement, on the entire repository.

Throws:

RepositoryException - If the statements could not be removed from the repository, for example because the repository is not writable.

clear

void clear(Resource... contexts)
    throws RepositoryException

Removes all statements from a specific contexts in the repository.

Parameters:

contexts - The context(s) to remove the data from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.

Throws:

RepositoryException - If the statements could not be removed from the repository, for example because the repository is not writable.

getNamespaces

RepositoryResult<Namespace> getNamespaces()
                                   throws RepositoryException

Gets all declared namespaces as a RepositoryResult of Namespace objects. Each Namespace object consists of a prefix and a namespace name.

Returns:

A RepositoryResult containing Namespace objects. Care should be taken to close the RepositoryResult after use.

Throws:

RepositoryException - If the namespaces could not be read from the repository.

getNamespace

String getNamespace(String prefix)
             throws RepositoryException

Gets the namespace that is associated with the specified prefix, if any.

Parameters:

prefix - A namespace prefix, or an empty string in case of the default namespace.

Returns:

The namespace name that is associated with the specified prefix, or null if there is no such namespace.

Throws:

RepositoryException - If the namespace could not be read from the repository.

NullPointerException - In case prefix is null.

setNamespace

void setNamespace(String prefix,
                  String name)
           throws RepositoryException

Sets the prefix for a namespace.

Parameters:

prefix - The new prefix, or an empty string in case of the default namespace.

name - The namespace name that the prefix maps to.

Throws:

RepositoryException - If the namespace could not be set in the repository, for example because the repository is not writable.

NullPointerException - In case prefix or name is null.

removeNamespace

void removeNamespace(String prefix)
              throws RepositoryException

Removes a namespace declaration by removing the association between a prefix and a namespace name.

Parameters:

prefix - The namespace prefix, or an empty string in case of the default namespace.

Throws:

RepositoryException - If the namespace prefix could not be removed.

NullPointerException - In case prefix is null.

clearNamespaces

void clearNamespaces()
              throws RepositoryException

Removes all namespace declarations from the repository.

Throws:

RepositoryException - If the namespace declarations could not be removed.