org.eclipse.rdf4j.repository.sail

## Class SailRepositoryConnection

- java.lang.Object
- - org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection
  - - org.eclipse.rdf4j.repository.sail.SailRepositoryConnection

- All Implemented Interfaces:
    AutoCloseable, HttpClientDependent, SesameClientDependent, SessionManagerDependent, FederatedServiceResolverClient, RepositoryConnection, RepositoryResolverClient
  Direct Known Subclasses:
    FedXRepositoryConnection

      public class SailRepositoryConnection
      extends AbstractRepositoryConnection
      implements FederatedServiceResolverClient, RepositoryResolverClient, HttpClientDependent, SessionManagerDependent

  An implementation of the `RepositoryConnection` interface that wraps a `SailConnection`.
  Author:
    Jeen Broekstra, Arjohn Kampman

- - ### Field Summary

    - ### Fields inherited from class org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection

      `logger`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `SailRepositoryConnection(SailRepository repository, SailConnection sailConnection)` Creates a new repository connection that will wrap the supplied SailConnection.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `addWithoutCommit(Resource subject, IRI predicate, Value object, Resource... contexts)`
    `void` | `begin()` Begins a new transaction, requiring `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` to be called to end the transaction.
    `void` | `begin(IsolationLevel level)` Begins a new transaction with the supplied `IsolationLevel`, requiring `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` to be called to end the transaction.
    `void` | `begin(TransactionSetting... settings)` Begins a new transaction with the supplied `TransactionSetting`, requiring `RepositoryConnection.commit()` or `RepositoryConnection.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.
    `void` | `close()` Closes the connection, freeing resources.
    `void` | `commit()` Commits the active transaction.
    `protected <E> RepositoryResult<E>` | `createRepositoryResult(CloseableIteration<? extends E,SailException> sailIter)` Wraps a CloseableIteration coming from a Sail in a RepositoryResult object, applying the required conversions
    `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.
    `org.apache.http.client.HttpClient` | `getHttpClient()` `HttpClient` that has been assigned or has been used by this object.
    `HttpClientSessionManager` | `getHttpClientSessionManager()` `HttpClientSessionManager` that has been assigned or has been used by this object.
    `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.
    `SailConnection` | `getSailConnection()` Returns the underlying SailConnection.
    `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.
    `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.
    `boolean` | `isActive()` Indicates if a transaction is currently active on the connection.
    `boolean` | `isEmpty()` Returns `true` if this repository does not contain any (explicit) statements.
    `boolean` | `isOpen()` Checks whether this connection is open.
    `void` | `prepare()` Checks for an error state in the active transaction that would force the transaction to be rolled back.
    `SailBooleanQuery` | `prepareBooleanQuery(QueryLanguage ql, String queryString, String baseURI)` Prepares queries that return `true` or `false`.
    `SailGraphQuery` | `prepareGraphQuery(QueryLanguage ql, String queryString, String baseURI)` Prepares queries that produce RDF graphs.
    `SailQuery` | `prepareQuery(QueryLanguage ql, String queryString, String baseURI)` Prepares a query for evaluation on this repository (optional operation).
    `SailTupleQuery` | `prepareTupleQuery(QueryLanguage ql, String queryString, String baseURI)` Prepares a query that produces sets of value tuples.
    `Update` | `prepareUpdate(QueryLanguage ql, String update, String baseURI)` Prepares an Update operation.
    `void` | `removeNamespace(String prefix)` Removes a namespace declaration by removing the association between a prefix and a namespace name.
    `protected void` | `removeWithoutCommit(Resource subject, IRI predicate, Value object, Resource... contexts)`
    `void` | `rollback()` Rolls back all updates in the active transaction.
    `void` | `setFederatedServiceResolver(FederatedServiceResolver resolver)` Sets the `FederatedServiceResolver` to use for this client.
    `void` | `setHttpClient(org.apache.http.client.HttpClient client)` Assign an `HttpClient` that this object should use.
    `void` | `setHttpClientSessionManager(HttpClientSessionManager client)` Assign an `HttpClientSessionManager` that this object should use.
    `void` | `setNamespace(String prefix, String name)` Sets the prefix for a namespace.
    `void` | `setRepositoryResolver(RepositoryResolver resolver)`
    `long` | `size(Resource... contexts)` Returns the number of (explicit) statements that are in the specified contexts in this repository.
    `String` | `toString()`

    - ### Methods inherited from class org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection

      `add, add, add, add, add, add, add, add, addWithoutCommit, conditionalCommit, conditionalRollback, export, getIsolationLevel, getParserConfig, getRepository, getValueFactory, hasStatement, isAutoCommit, prepareBooleanQuery, prepareGraphQuery, prepareQuery, prepareTupleQuery, prepareUpdate, remove, remove, remove, remove, removeWithoutCommit, setAutoCommit, setIsolationLevel, setParserConfig, startLocalTransaction`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.eclipse.rdf4j.http.client.SesameClientDependent

      `getSesameClient, setSesameClient`

    - ### Methods inherited from interface org.eclipse.rdf4j.repository.RepositoryConnection

      `add, add, add, add, add, add, add, add, getStatements, getStatements, hasStatement, prepareBooleanQuery, prepareGraphQuery, prepareQuery, prepareTupleQuery, prepareUpdate, remove, remove`

- - ### Constructor Detail

    - #### SailRepositoryConnection

          protected SailRepositoryConnection(SailRepository repository,
                                             SailConnection sailConnection)

      Creates a new repository connection that will wrap the supplied SailConnection. SailRepositoryConnection objects are created by `SailRepository.getConnection()`.

  - ### Method Detail

    - #### getSailConnection

          public SailConnection getSailConnection()

      Returns the underlying SailConnection.

    - #### setFederatedServiceResolver

          public void setFederatedServiceResolver(FederatedServiceResolver resolver)

      Description copied from interface: `FederatedServiceResolverClient`
      Sets the `FederatedServiceResolver` to use for this client.
      Specified by:
        `setFederatedServiceResolver` in interface `FederatedServiceResolverClient`
      Parameters:
        `resolver` - The resolver to use.

    - #### setRepositoryResolver

          public void setRepositoryResolver(RepositoryResolver resolver)

      Specified by:
        `setRepositoryResolver` in interface `RepositoryResolverClient`

    - #### getHttpClientSessionManager

          public HttpClientSessionManager getHttpClientSessionManager()

      Description copied from interface: `SessionManagerDependent`
      `HttpClientSessionManager` that has been assigned or has been used by this object. The life cycle might not be or might be tied to this object, depending on whether `HttpClientSessionManager` was passed to or created by this object respectively.
      Specified by:
        `getHttpClientSessionManager` in interface `SesameClientDependent`
      Specified by:
        `getHttpClientSessionManager` in interface `SessionManagerDependent`
      Returns:
        a `HttpClientSessionManager` instance or null

    - #### setHttpClientSessionManager

          public void setHttpClientSessionManager(HttpClientSessionManager client)

      Description copied from interface: `SessionManagerDependent`
      Assign an `HttpClientSessionManager` that this object should use. The life cycle of the given `HttpClientSessionManager` is independent of this object. Closing or shutting down this object does not have any impact on the given client. Callers must ensure that the given client is properly closed elsewhere.
      Specified by:
        `setHttpClientSessionManager` in interface `SesameClientDependent`
      Specified by:
        `setHttpClientSessionManager` in interface `SessionManagerDependent`

    - #### getHttpClient

          public org.apache.http.client.HttpClient getHttpClient()

      Description copied from interface: `HttpClientDependent`
      `HttpClient` that has been assigned or has been used by this object. The life cycle might not be or might be tied to this object, depending on whether `HttpClient` was passed to or created by this object respectively.
      Specified by:
        `getHttpClient` in interface `HttpClientDependent`
      Returns:
        an `HttpClient` instance or null

    - #### setHttpClient

          public void setHttpClient(org.apache.http.client.HttpClient client)

      Description copied from interface: `HttpClientDependent`
      Assign an `HttpClient` that this object should use. The life cycle of the given `HttpClient` is independent of this object. Closing or shutting down this object does not have any impact on the given client. Callers must ensure that the given client is properly closed elsewhere.
      Specified by:
        `setHttpClient` in interface `HttpClientDependent`

    - #### begin

          public void begin()
                     throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Begins a new transaction, requiring `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` to be called to end the transaction. The transaction will use the currently set `isolation level` for this connection.
      Specified by:
        `begin` in interface `RepositoryConnection`
      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:
        `RepositoryConnection.begin(IsolationLevel)`, `RepositoryConnection.isActive()`, `RepositoryConnection.commit()`, `RepositoryConnection.rollback()`, `RepositoryConnection.setIsolationLevel(IsolationLevel)`

    - #### begin

          public void begin(IsolationLevel level)
                     throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Begins a new transaction with the supplied `IsolationLevel`, requiring `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` to be called to end the transaction.
      Specified by:
        `begin` in interface `RepositoryConnection`
      Overrides:
        `begin` in class `AbstractRepositoryConnection`
      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:
        `RepositoryConnection.begin()`, `RepositoryConnection.isActive()`, `RepositoryConnection.commit()`, `RepositoryConnection.rollback()`, `RepositoryConnection.setIsolationLevel(IsolationLevel)`

    - #### begin

          public void begin(TransactionSetting... settings)

      Description copied from interface: `RepositoryConnection`
      Begins a new transaction with the supplied `TransactionSetting`, requiring `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` to be called to end the transaction.
      Specified by:
        `begin` in interface `RepositoryConnection`
      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.
      See Also:
        `RepositoryConnection.begin()`, `RepositoryConnection.isActive()`, `RepositoryConnection.commit()`, `RepositoryConnection.rollback()`, `RepositoryConnection.setIsolationLevel(IsolationLevel)`

    - #### prepare

          public void prepare()
                       throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Checks for an error state in the active transaction that would force the transaction to be rolled back. This is an optional call; calling or not calling this method should have no effect on the outcome of `RepositoryConnection.commit()` or `RepositoryConnection.rollback()`. A call to this method must be followed by (in the same thread) with a call to `RepositoryConnection.prepare()` , `RepositoryConnection.commit()`, `RepositoryConnection.rollback()`, or `RepositoryConnection.close()` . This method may be called multiple times within the same transaction by the same thread. If this method returns normally, the caller can reasonably expect that a subsequent call to `RepositoryConnection.commit()` will also return normally. If this method returns with an exception the caller should treat the exception as if it came from a call to `RepositoryConnection.commit()`.
      Specified by:
        `prepare` in interface `RepositoryConnection`
      Throws:
        `UnknownTransactionStateException` - If the transaction state can not be determined (this can happen for instance when communication between client and server fails or times-out). It does not indicate a problem with the integrity of the store.
        `RepositoryException` - If there is an active transaction and it cannot be committed.
      See Also:
        `RepositoryConnection.commit()`, `RepositoryConnection.begin()`, `RepositoryConnection.rollback()`

    - #### commit

          public void commit()
                      throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Commits the active transaction. This operation ends the active transaction.
      Specified by:
        `commit` in interface `RepositoryConnection`
      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:
        `RepositoryConnection.isActive()`, `RepositoryConnection.begin()`, `RepositoryConnection.rollback()`, `RepositoryConnection.prepare()`

    - #### rollback

          public void rollback()
                        throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Rolls back all updates in the active transaction. This operation ends the active transaction.
      Specified by:
        `rollback` in interface `RepositoryConnection`
      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:
        `RepositoryConnection.isActive()`, `RepositoryConnection.begin()`, `RepositoryConnection.commit()`

    - #### close

          public void close()
                     throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Closes the connection, freeing resources. If a `transaction` is `active` on the connection, all non-committed operations will be lost by actively calling `RepositoryConnection.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`
      Specified by:
        `close` in interface `RepositoryConnection`
      Overrides:
        `close` in class `AbstractRepositoryConnection`
      Throws:
        `RepositoryException` - If the connection could not be closed.

    - #### isOpen

          public boolean isOpen()
                         throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Checks whether this connection is open. A connection is open from the moment it is created until it is closed.
      Specified by:
        `isOpen` in interface `RepositoryConnection`
      Overrides:
        `isOpen` in class `AbstractRepositoryConnection`
      Throws:
        `RepositoryException`
      See Also:
        `RepositoryConnection.close()`

    - #### prepareQuery

          public SailQuery prepareQuery(QueryLanguage ql,
                                        String queryString,
                                        String baseURI)
                                 throws MalformedQueryException

      Description copied from interface: `RepositoryConnection`
      Prepares a query for evaluation on this repository (optional operation).

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

      Specified by:
        `prepareQuery` in interface `RepositoryConnection`
      Parameters:
        `ql` - The `query language` in which the query is formulated.
        `queryString` - 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.

    - #### prepareTupleQuery

          public SailTupleQuery prepareTupleQuery(QueryLanguage ql,
                                                  String queryString,
                                                  String baseURI)
                                           throws MalformedQueryException

      Description copied from interface: `RepositoryConnection`
      Prepares a query that produces sets of value tuples.
      Specified by:
        `prepareTupleQuery` in interface `RepositoryConnection`
      Parameters:
        `ql` - The `query language` in which the query is formulated.
        `queryString` - 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:
        `MalformedQueryException` - If the supplied query is malformed.

    - #### prepareGraphQuery

          public SailGraphQuery prepareGraphQuery(QueryLanguage ql,
                                                  String queryString,
                                                  String baseURI)
                                           throws MalformedQueryException

      Description copied from interface: `RepositoryConnection`
      Prepares queries that produce RDF graphs.
      Specified by:
        `prepareGraphQuery` in interface `RepositoryConnection`
      Parameters:
        `ql` - The `query language` in which the query is formulated.
        `queryString` - 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:
        `MalformedQueryException` - If the supplied query is malformed.

    - #### prepareBooleanQuery

          public SailBooleanQuery prepareBooleanQuery(QueryLanguage ql,
                                                      String queryString,
                                                      String baseURI)
                                               throws MalformedQueryException

      Description copied from interface: `RepositoryConnection`
      Prepares queries that return `true` or `false`.
      Specified by:
        `prepareBooleanQuery` in interface `RepositoryConnection`
      Parameters:
        `ql` - The `query language` in which the query is formulated.
        `queryString` - 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:
        `MalformedQueryException` - If the supplied query is malformed.

    - #### prepareUpdate

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

      Description copied from interface: `RepositoryConnection`
      Prepares an Update operation.
      Specified by:
        `prepareUpdate` in interface `RepositoryConnection`
      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`

    - #### hasStatement

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

      Description copied from interface: `RepositoryConnection`
      Checks whether the repository contains statements with a specific subject, predicate and/or object, optionally in the specified contexts.
      Specified by:
        `hasStatement` in interface `RepositoryConnection`
      Overrides:
        `hasStatement` in class `AbstractRepositoryConnection`
      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.
        `includeInferred` - if false, no inferred statements are considered; if true, inferred statements are considered if available
        `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.
      Returns:
        true If a matching statement is in the repository in the specified context, false otherwise.
      Throws:
        `RepositoryException`

    - #### getContextIDs

          public RepositoryResult<Resource> getContextIDs()
                                                   throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      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.
      Specified by:
        `getContextIDs` in interface `RepositoryConnection`
      Returns:
        a RepositoryResult object containing Resources that are used as context identifiers.
      Throws:
        `RepositoryException`

    - #### getStatements

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

      Description copied from interface: `RepositoryConnection`
      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.
      Specified by:
        `getStatements` in interface `RepositoryConnection`
      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.
        `includeInferred` - if false, no inferred statements are returned; if true, inferred statements are returned if available. The default is true.
        `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 `Statement`s and optionally throwing a `RepositoryException` when an error when a problem occurs during retrieval.
      Throws:
        `RepositoryException`

    - #### isEmpty

          public boolean isEmpty()
                          throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Returns `true` if this repository does not contain any (explicit) statements.
      Specified by:
        `isEmpty` in interface `RepositoryConnection`
      Overrides:
        `isEmpty` in class `AbstractRepositoryConnection`
      Returns:
        `true` if this repository is empty, `false` otherwise.
      Throws:
        `RepositoryException` - If the repository could not be checked to be empty.

    - #### exportStatements

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

      Description copied from interface: `RepositoryConnection`
      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.
      Specified by:
        `exportStatements` in interface `RepositoryConnection`
      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.
        `includeInferred` - if false, no inferred statements are returned; if true, inferred statements are returned if available
        `handler` - The handler that will handle the RDF data.
        `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.
      Throws:
        `RDFHandlerException` - If the handler encounters an unrecoverable error.
        `RepositoryException`

    - #### size

          public long size(Resource... contexts)
                    throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Returns the number of (explicit) statements that are in the specified contexts in this repository.
      Specified by:
        `size` in interface `RepositoryConnection`
      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`

    - #### addWithoutCommit

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

      Specified by:
        `addWithoutCommit` in class `AbstractRepositoryConnection`
      Throws:
        `RepositoryException`

    - #### removeWithoutCommit

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

      Specified by:
        `removeWithoutCommit` in class `AbstractRepositoryConnection`
      Throws:
        `RepositoryException`

    - #### clear

          public void clear(Resource... contexts)
                     throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Removes all statements from a specific contexts in the repository.
      Specified by:
        `clear` in interface `RepositoryConnection`
      Overrides:
        `clear` in class `AbstractRepositoryConnection`
      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.

    - #### setNamespace

          public void setNamespace(String prefix,
                                   String name)
                            throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Sets the prefix for a namespace.
      Specified by:
        `setNamespace` in interface `RepositoryConnection`
      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.

    - #### removeNamespace

          public void removeNamespace(String prefix)
                               throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Removes a namespace declaration by removing the association between a prefix and a namespace name.
      Specified by:
        `removeNamespace` in interface `RepositoryConnection`
      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.

    - #### clearNamespaces

          public void clearNamespaces()
                               throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Removes all namespace declarations from the repository.
      Specified by:
        `clearNamespaces` in interface `RepositoryConnection`
      Throws:
        `RepositoryException` - If the namespace declarations could not be removed.

    - #### getNamespaces

          public RepositoryResult<Namespace> getNamespaces()
                                                    throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Gets all declared namespaces as a RepositoryResult of `Namespace` objects. Each Namespace object consists of a prefix and a namespace name.
      Specified by:
        `getNamespaces` in interface `RepositoryConnection`
      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

          public String getNamespace(String prefix)
                              throws RepositoryException

      Description copied from interface: `RepositoryConnection`
      Gets the namespace that is associated with the specified prefix, if any.
      Specified by:
        `getNamespace` in interface `RepositoryConnection`
      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.

    - #### createRepositoryResult

          protected <E> RepositoryResult<E> createRepositoryResult(CloseableIteration<? extends E,SailException> sailIter)

      Wraps a CloseableIteration coming from a Sail in a RepositoryResult object, applying the required conversions

    - #### isActive

          public boolean isActive()
                           throws UnknownTransactionStateException

      Description copied from interface: `RepositoryConnection`
      Indicates if a transaction is currently active on the connection. A transaction is active if `RepositoryConnection.begin()` has been called, and becomes inactive after `RepositoryConnection.commit()` or `RepositoryConnection.rollback()` has been called.
      Specified by:
        `isActive` in interface `RepositoryConnection`
      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.

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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