org.eclipse.rdf4j.repository.base

Class RepositoryConnectionWrapper

java.lang.Object

org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection

org.eclipse.rdf4j.repository.base.RepositoryConnectionWrapper

All Implemented Interfaces:

AutoCloseable, DelegatingRepositoryConnection, RepositoryConnection

Direct Known Subclasses:

ContextAwareConnection, DatasetRepositoryConnection, InterceptingRepositoryConnectionWrapper, NotifyingRepositoryConnectionWrapper

public class RepositoryConnectionWrapper
extends AbstractRepositoryConnection
implements DelegatingRepositoryConnection

Delegates all calls to the delegate RepositoryConnection. Conditionally processes add/remove/read to common base method to make them easier to override.

Author:

James Leigh

See Also:

isDelegatingAdd(), isDelegatingRemove(), isDelegatingRead()

Field Summary

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

logger

Constructor Summary

Constructors

Constructor and Description
RepositoryConnectionWrapper(Repository repository)
RepositoryConnectionWrapper(Repository repository, RepositoryConnection delegate)

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> statementIter, 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.
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.
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.
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	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 void	exportStatements(RepositoryResult<Statement> stIter, RDFHandler handler) Exports all statements contained in the supplied statement iterator and all relevant namespace information 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.
RepositoryConnection	getDelegate()
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.
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	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.
protected boolean	isDelegatingAdd() If false then the following add methods will call addWithoutCommit(Resource, IRI, Value, Resource[]).
protected boolean	isDelegatingRead() If false then the following has/export/isEmpty methods will call getStatements(Resource, IRI, Value, boolean, Resource[]).
protected boolean	isDelegatingRemove() If false then the following remove methods will call removeWithoutCommit(Resource, IRI, Value, Resource[]).
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, String baseURI) Prepares queries that return true or false.
GraphQuery	prepareGraphQuery(QueryLanguage ql, String query, String baseURI) Prepares queries that produce RDF graphs.
Query	prepareQuery(QueryLanguage ql, String query, String baseURI) Prepares a query for evaluation on this repository (optional operation).
TupleQuery	prepareTupleQuery(QueryLanguage ql, String query, String baseURI) Prepares a query that produces sets of value tuples.
Update	prepareUpdate(QueryLanguage ql, String update, String baseURI) Prepares an 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> statementIter, 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.
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.
protected void	removeWithoutCommit(Resource subject, IRI predicate, Value object, Resource... contexts)
void	rollback() Rolls back all updates in the active transaction.
void	setAutoCommit(boolean autoCommit) Deprecated. use begin() instead.
void	setDelegate(RepositoryConnection delegate)
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 parserConfig) 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.

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

addWithoutCommit, conditionalCommit, conditionalRollback, export, getParserConfig, getRepository, getValueFactory, prepareBooleanQuery, prepareGraphQuery, prepareQuery, prepareTupleQuery, prepareUpdate, removeWithoutCommit, startLocalTransaction

Methods inherited from class java.lang.Object

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

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

add, export, getParserConfig, getRepository, getStatements, getStatements, getValueFactory, hasStatement, prepareBooleanQuery, prepareBooleanQuery, prepareGraphQuery, prepareGraphQuery, prepareQuery, prepareQuery, prepareTupleQuery, prepareTupleQuery, prepareUpdate, prepareUpdate, remove

Constructor Detail

RepositoryConnectionWrapper

public RepositoryConnectionWrapper(Repository repository)

RepositoryConnectionWrapper

public RepositoryConnectionWrapper(Repository repository,
                                   RepositoryConnection delegate)

Method Detail

getDelegate

public RepositoryConnection getDelegate()

Specified by:

getDelegate in interface DelegatingRepositoryConnection

setDelegate

public void setDelegate(RepositoryConnection delegate)

Specified by:

setDelegate in interface DelegatingRepositoryConnection

isDelegatingAdd

protected boolean isDelegatingAdd()
                           throws RepositoryException

If false then the following add methods will call addWithoutCommit(Resource, IRI, Value, Resource[]).

Returns:

true to delegate add methods, false to call addWithoutCommit(Resource, IRI, Value, Resource[])

Throws:

RepositoryException

See Also:

add(Iterable, Resource...), add(Iteration, Resource...), add(Statement, Resource...), add(File, String, RDFFormat, Resource...), add(InputStream, String, RDFFormat, Resource...), add(Reader, String, RDFFormat, Resource...), add(Resource, IRI, Value, Resource...), add(URL, String, RDFFormat, Resource...)

isDelegatingRead

protected boolean isDelegatingRead()
                            throws RepositoryException

If false then the following has/export/isEmpty methods will call getStatements(Resource, IRI, Value, boolean, Resource[]).

Returns:

true to delegate read methods, false to call getStatements(Resource, IRI, Value, boolean, Resource[])

Throws:

RepositoryException

See Also:

exportStatements(Resource, IRI, Value, boolean, RDFHandler, Resource...), hasStatement(Statement, boolean, Resource...), hasStatement(Resource, IRI, Value, boolean, Resource...), isEmpty()

isDelegatingRemove

protected boolean isDelegatingRemove()
                              throws RepositoryException

If false then the following remove methods will call removeWithoutCommit(Resource, IRI, Value, Resource[]).

Returns:

true to delegate remove methods, false to call removeWithoutCommit(Resource, IRI, Value, Resource...)

Throws:

RepositoryException

See Also:

clear(Resource...), remove(Iterable, Resource...), remove(Iteration, Resource...), remove(Statement, Resource...), remove(Resource, IRI, Value, Resource...)

setParserConfig

public void setParserConfig(ParserConfig parserConfig)

Description copied from interface: RepositoryConnection

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

Specified by:

setParserConfig in interface RepositoryConnection

Overrides:

setParserConfig in class AbstractRepositoryConnection

Parameters:

parserConfig - a Rio RDF Parser configuration.

add

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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.

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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.

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

Parameters:

statementIter - 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

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

Description copied from interface: RepositoryConnection

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.

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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.

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

add in interface RepositoryConnection

Overrides:

add in class AbstractRepositoryConnection

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.

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.

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.

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.

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()

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.

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

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

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.

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.

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 Statements and optionally throwing a RepositoryException when an error when a problem occurs during retrieval.

Throws:

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

hasStatement

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

Description copied from interface: RepositoryConnection

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

Specified by:

hasStatement in interface RepositoryConnection

Overrides:

hasStatement in class AbstractRepositoryConnection

Parameters:

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

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

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:

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

Throws:

RepositoryException

isAutoCommit

@Deprecated
public boolean isAutoCommit()
                                 throws RepositoryException

Deprecated. since 2.0. Use isActive() instead.

Description copied from interface: RepositoryConnection

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

Specified by:

isAutoCommit in interface RepositoryConnection

Overrides:

isAutoCommit in class AbstractRepositoryConnection

Throws:

RepositoryException - If a repository access error occurs.

isActive

public boolean isActive()
                 throws UnknownTransactionStateException,
                        RepositoryException

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.

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.

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()

prepareGraphQuery

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

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.

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:

MalformedQueryException - If the supplied query is malformed.

RepositoryException

prepareQuery

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

Description copied from interface: RepositoryConnection

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

Specified by:

prepareQuery in interface RepositoryConnection

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.

RepositoryException

prepareTupleQuery

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

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.

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:

MalformedQueryException - If the supplied query is malformed.

RepositoryException

prepareBooleanQuery

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

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.

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:

MalformedQueryException - If the supplied query is malformed.

RepositoryException

prepareUpdate

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

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

remove

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

Description copied from interface: RepositoryConnection

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

Specified by:

remove in interface RepositoryConnection

Overrides:

remove in class AbstractRepositoryConnection

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

remove in interface RepositoryConnection

Overrides:

remove in class AbstractRepositoryConnection

Parameters:

statementIter - 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

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

Description copied from interface: RepositoryConnection

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

Specified by:

remove in interface RepositoryConnection

Overrides:

remove in class AbstractRepositoryConnection

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

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

Description copied from interface: RepositoryConnection

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

Specified by:

remove in interface RepositoryConnection

Overrides:

remove in class AbstractRepositoryConnection

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.

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.

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()

setAutoCommit

@Deprecated
public void setAutoCommit(boolean autoCommit)
                               throws RepositoryException

Deprecated. use begin() instead.

Description copied from interface: RepositoryConnection

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 RepositoryConnection.commit() or RepositoryConnection.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.

Specified by:

setAutoCommit in interface RepositoryConnection

Overrides:

setAutoCommit in class AbstractRepositoryConnection

Throws:

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

See Also:

RepositoryConnection.commit()

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.

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

exportStatements

protected void exportStatements(RepositoryResult<Statement> stIter,
                                RDFHandler handler)
                         throws RepositoryException,
                                RDFHandlerException

Exports all statements contained in the supplied statement iterator and all relevant namespace information to the supplied RDFHandler.

Throws:

RepositoryException

RDFHandlerException

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(), #setIsolationLevel()

setIsolationLevel

public void setIsolationLevel(IsolationLevel level)
                       throws IllegalStateException

Description copied from interface: RepositoryConnection

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 RepositoryConnection.begin() will result in an exception.

Specified by:

setIsolationLevel in interface RepositoryConnection

Overrides:

setIsolationLevel in class AbstractRepositoryConnection

Parameters:

level - the transaction isolation level to set.

Throws:

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

getIsolationLevel

public IsolationLevel getIsolationLevel()

Description copied from interface: RepositoryConnection

Retrieves the current transaction isolation level of the connection.

Specified by:

getIsolationLevel in interface RepositoryConnection

Overrides:

getIsolationLevel in class AbstractRepositoryConnection

Returns:

the current transaction isolation level.