org.eclipse.rdf4j.repository.util

Class Repositories

java.lang.Object

org.eclipse.rdf4j.repository.util.Repositories

public final class Repositories
extends Object

Utility for dealing with Repository and RepositoryConnection objects.

Author:

Peter Ansell

Method Summary

Modifier and Type	Method and Description
static void	consume(Repository repository, java.util.function.Consumer<RepositoryConnection> processFunction) Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static void	consume(Repository repository, java.util.function.Consumer<RepositoryConnection> processFunction, java.util.function.Consumer<RepositoryException> exceptionHandler) Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static void	consumeSilent(Repository repository, java.util.function.Consumer<RepositoryConnection> processFunction) Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static <T> T	get(Repository repository, java.util.function.Function<RepositoryConnection,T> processFunction) Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static <T> T	get(Repository repository, java.util.function.Function<RepositoryConnection,T> processFunction, java.util.function.Consumer<RepositoryException> exceptionHandler) Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static <T> T	getSilent(Repository repository, java.util.function.Function<RepositoryConnection,T> processFunction) Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.
static <T> T	graphQuery(Repository repository, String query, java.util.function.Function<GraphQueryResult,T> processFunction) Performs a SPARQL Construct or Describe query on the given Repository and passes the results to the given Function with the result from the function returned by the method.
static void	graphQuery(Repository repository, String query, RDFHandler handler) Performs a SPARQL Construct or Describe query on the given Repository and passes the results to the given RDFHandler.
static java.util.function.Supplier<RepositoryException>	repositoryException(String message) Creates a Supplier of RepositoryException objects that be passed to Optional.orElseThrow(Supplier) to generate exceptions as necessary.
static <T> T	tupleQuery(Repository repository, String query, java.util.function.Function<TupleQueryResult,T> processFunction) Performs a SPARQL Select query on the given Repository and passes the results to the given Function with the result from the function returned by the method.
static void	tupleQuery(Repository repository, String query, TupleQueryResultHandler handler) Performs a SPARQL Select query on the given Repository and passes the results to the given TupleQueryResultHandler.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

consume

public static void consume(Repository repository,
                           java.util.function.Consumer<RepositoryConnection> processFunction)
                    throws RepositoryException,
                           UnknownTransactionStateException

Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Consumer that performs an action on the connection.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

consume

public static void consume(Repository repository,
                           java.util.function.Consumer<RepositoryConnection> processFunction,
                           java.util.function.Consumer<RepositoryException> exceptionHandler)
                    throws RepositoryException,
                           UnknownTransactionStateException

Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Consumer that performs an action on the connection.

exceptionHandler - A Consumer that handles an exception if one was generated.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

consumeSilent

public static void consumeSilent(Repository repository,
                                 java.util.function.Consumer<RepositoryConnection> processFunction)

Opens a RepositoryConnection to the given Repository, sends the connection to the given Consumer, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Consumer that performs an action on the connection.

get

public static <T> T get(Repository repository,
                        java.util.function.Function<RepositoryConnection,T> processFunction)
                 throws RepositoryException,
                        UnknownTransactionStateException

Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Type Parameters:

T - The type of the return value.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Function that performs an action on the connection and returns a result.

Returns:

The result of applying the function.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

get

public static <T> T get(Repository repository,
                        java.util.function.Function<RepositoryConnection,T> processFunction,
                        java.util.function.Consumer<RepositoryException> exceptionHandler)
                 throws RepositoryException,
                        UnknownTransactionStateException

Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Type Parameters:

T - The type of the return value.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Function that performs an action on the connection and returns a result.

exceptionHandler - A Consumer that handles an exception if one was generated.

Returns:

The result of applying the function, or null if an exception occurs and the exception handler does not rethrow the exception.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

getSilent

public static <T> T getSilent(Repository repository,
                              java.util.function.Function<RepositoryConnection,T> processFunction)

Opens a RepositoryConnection to the given Repository, sends the connection to the given Function, before either rolling back the transaction if it failed, or committing the transaction if it was successful.

Type Parameters:

T - The type of the return value.

Parameters:

repository - The Repository to open a connection to.

processFunction - A Function that performs an action on the connection and returns a result.

Returns:

The result of applying the function, or null if an exception is thrown.

tupleQuery

public static <T> T tupleQuery(Repository repository,
                               String query,
                               java.util.function.Function<TupleQueryResult,T> processFunction)
                        throws RepositoryException,
                               UnknownTransactionStateException,
                               MalformedQueryException,
                               QueryEvaluationException

Performs a SPARQL Select query on the given Repository and passes the results to the given Function with the result from the function returned by the method.

Type Parameters:

T - The type of the return value.

Parameters:

repository - The Repository to open a connection to.

query - The SPARQL Select query to execute.

processFunction - A Function that performs an action on the results of the query and returns a result.

Returns:

The result of processing the query results.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

MalformedQueryException - If the supplied query is malformed

QueryEvaluationException - If there was an error evaluating the query

tupleQuery

public static void tupleQuery(Repository repository,
                              String query,
                              TupleQueryResultHandler handler)
                       throws RepositoryException,
                              UnknownTransactionStateException,
                              MalformedQueryException,
                              QueryEvaluationException

Performs a SPARQL Select query on the given Repository and passes the results to the given TupleQueryResultHandler.

Parameters:

repository - The Repository to open a connection to.

query - The SPARQL Select query to execute.

handler - A TupleQueryResultHandler that consumes the results.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

MalformedQueryException - If the supplied query is malformed

QueryEvaluationException - If there was an error evaluating the query

graphQuery

public static <T> T graphQuery(Repository repository,
                               String query,
                               java.util.function.Function<GraphQueryResult,T> processFunction)
                        throws RepositoryException,
                               UnknownTransactionStateException,
                               MalformedQueryException,
                               QueryEvaluationException

Performs a SPARQL Construct or Describe query on the given Repository and passes the results to the given Function with the result from the function returned by the method.

Type Parameters:

T - The type of the return value.

Parameters:

repository - The Repository to open a connection to.

query - The SPARQL Construct or Describe query to execute.

processFunction - A Function that performs an action on the results of the query and returns a result.

Returns:

The result of processing the query results.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

MalformedQueryException - If the supplied query is malformed

QueryEvaluationException - If there was an error evaluating the query

graphQuery

public static void graphQuery(Repository repository,
                              String query,
                              RDFHandler handler)
                       throws RepositoryException,
                              UnknownTransactionStateException,
                              MalformedQueryException,
                              QueryEvaluationException

Performs a SPARQL Construct or Describe query on the given Repository and passes the results to the given RDFHandler.

Parameters:

repository - The Repository to open a connection to.

query - The SPARQL Construct or Describe query to execute.

handler - An RDFHandler that consumes the results.

Throws:

RepositoryException - If there was an exception dealing with the Repository.

UnknownTransactionStateException - If the transaction state was not properly recognised. (Optional specific exception)

MalformedQueryException - If the supplied query is malformed

QueryEvaluationException - If there was an error evaluating the query

repositoryException

public static java.util.function.Supplier<RepositoryException> repositoryException(String message)

Creates a Supplier of RepositoryException objects that be passed to Optional.orElseThrow(Supplier) to generate exceptions as necessary.

Parameters:

message - The message to be used for the exception

Returns:

A Supplier that will create RepositoryException objects with the given message.