Package org.eclipse.rdf4j.repository.sparql

Class SPARQLConnection

java.lang.Object

org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection

org.eclipse.rdf4j.repository.sparql.SPARQLConnection

All Implemented Interfaces:

AutoCloseable, HttpClientDependent, RepositoryConnection

public class SPARQLConnection
extends AbstractRepositoryConnection
implements HttpClientDependent

Provides a RepositoryConnection interface to any SPARQL endpoint.

Author:

James Leigh

Field Summary

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

logger

Constructor Summary

Constructors

Constructor	Description
SPARQLConnection(SPARQLRepository repository, SPARQLProtocolSession client)
SPARQLConnection(SPARQLRepository repository, SPARQLProtocolSession client, boolean quadMode)

Method Summary

Modifier and Type	Method	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(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(Iterable<? extends Statement> statements, Resource... contexts)	Adds the supplied statements to this repository, optionally to one or more named contexts.
void	add(URL url, String baseURI, RDFFormat dataFormat, Resource... contexts)	Adds the RDF data that can be found at the specified URL to the repository, optionally to one or more named contexts.
void	add(Statement st, Resource... contexts)	Adds the supplied statement to this repository, optionally to one or more named contexts.
protected void	addWithoutCommit(Resource subject, IRI predicate, Value object, Resource... contexts)
protected void	addWithoutCommit(Statement st, Resource... contexts)
void	begin()	Begins a new transaction, 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.
void	enableSilentMode(boolean flag)	Deprecated. Use setSilentClear(boolean) instead.
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.
final org.apache.http.client.HttpClient	getHttpClient()	HttpClient 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.
SPARQLRepository	getRepository()	Returns the Repository object to which this connection belongs.
RepositoryResult<Statement>	getStatements(Resource subj, IRI pred, Value obj, boolean includeInferred, Resource... contexts)	Gets all statements with a specific subject, predicate and/or object from the repository.
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.
protected boolean	isQuadMode()	Shall graph information also be retrieved, e.g.
protected boolean	isSilentClear()
void	prepare()	Checks for an error state in the active transaction that would force the transaction to be rolled back.
BooleanQuery	prepareBooleanQuery(QueryLanguage ql, String query, String base)	Prepares queries that return true or false.
GraphQuery	prepareGraphQuery(QueryLanguage ql, String query, String base)	Prepares queries that produce RDF graphs.
Query	prepareQuery(QueryLanguage ql, String query, String base)	Prepares a query for evaluation on this repository (optional operation).
TupleQuery	prepareTupleQuery(QueryLanguage ql, String query, String base)	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.
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)
protected void	removeWithoutCommit(Statement st, Resource... contexts)
void	rollback()	Rolls back all updates in the active transaction.
void	setHttpClient(org.apache.http.client.HttpClient httpClient)	Assign an HttpClient that this object should use.
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.
void	setSilentClear(boolean silent)	Configure the connection to execute clear(Resource...) operations silently: the remote endpoint will not respond with an error if the supplied named graph does not exist on the endpoint.
long	size(Resource... contexts)	Returns the number of (explicit) statements that are in the specified contexts in this repository.
protected Iteration<Statement,QueryEvaluationException>	toStatementIteration(TupleQueryResult iter, Resource subj, IRI pred, Value obj)	Deprecated, for removal: This API element is subject to removal in a future version.
String	toString()

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

add, add, begin, conditionalCommit, conditionalRollback, export, getIsolationLevel, getParserConfig, getValueFactory, hasStatement, isAutoCommit, isOpen, prepareBooleanQuery, prepareGraphQuery, prepareQuery, prepareTupleQuery, prepareUpdate, remove, remove, setAutoCommit, setIsolationLevel, 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.repository.RepositoryConnection

add, add, add, add, add, add, add, add, begin, getStatements, prepareBooleanQuery, prepareGraphQuery, prepareQuery, prepareTupleQuery, prepareUpdate, remove, remove

Constructor Details

SPARQLConnection

public SPARQLConnection(SPARQLRepository repository,
 SPARQLProtocolSession client)

SPARQLConnection

public SPARQLConnection(SPARQLRepository repository,
 SPARQLProtocolSession client,
 boolean quadMode)

Method Details

toString

public String toString()

Overrides:

toString in class Object

setSilentClear

public void setSilentClear(boolean silent)

Configure the connection to execute clear(Resource...) operations silently: the remote endpoint will not respond with an error if the supplied named graph does not exist on the endpoint.

By default, the SPARQL connection executes the clear(Resource...) API operation by converting it to a SPARQL `CLEAR GRAPH` update operation. This operation has an optional SILENT modifier, which can be enabled by setting this flag to true. The behavior of this modifier is speficied as follows in the SPARQL 1.1 Recommendation:

If the store records the existence of empty graphs, then the SPARQL 1.1 Update service, by default, SHOULD return failure if the specified graph does not exist. If SILENT is present, the result of the operation will always be success.

Stores that do not record empty graphs will always return success.

Note that in most SPARQL endpoint implementations not recording empty graphs is the default behavior, and setting this flag to true will have no effect. Setting this flag will have no effect on any other errors or other API or SPARQL operations: only the behavior of the clear(Resource...) API operation is modified to respond with a success message when removing a non-existent named graph.

Parameters:

silent - the value to set this to.

enableSilentMode

@Deprecated(since="3.6.0")
public void enableSilentMode(boolean flag)

Deprecated.

Use setSilentClear(boolean) instead.

Configure the connection to execute clear(Resource...) operations silently: the remote endpoint will not respond with an error if the supplied named graph does not exist on the endpoint.

By default, the SPARQL connection executes the clear(Resource...) API operation by converting it to a SPARQL `CLEAR GRAPH` update operation. This operation has an optional SILENT modifier, which can be enabled by setting this flag to true. The behavior of this modifier is speficied as follows in the SPARQL 1.1 Recommendation:

If the store records the existence of empty graphs, then the SPARQL 1.1 Update service, by default, SHOULD return failure if the specified graph does not exist. If SILENT is present, the result of the operation will always be success.

Stores that do not record empty graphs will always return success.

Note that in most SPARQL endpoint implementations not recording empty graphs is the default behavior, and setting this flag to true will have no effect. Setting this flag will have no effect on any other errors or other API or SPARQL operations: only the behavior of the clear(Resource...) API operation is modified to respond with a success message when removing a non-existent named graph.

Parameters:

flag - the value to set this to.

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.

getHttpClient

public final 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 httpClient)

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

Parameters:

httpClient -

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.

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

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

Specified by:

getNamespace in class AbstractRepositoryConnection

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.

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.

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

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

getRepository

public SPARQLRepository getRepository()

Description copied from interface: RepositoryConnection

Returns the Repository object to which this connection belongs.

Specified by:

getRepository in interface RepositoryConnection

Overrides:

getRepository in class AbstractRepositoryConnection

prepareQuery

public Query prepareQuery(QueryLanguage ql,
 String query,
 String base)
                   throws RepositoryException,
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.

query - The query string.

base - 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

prepareBooleanQuery

public BooleanQuery prepareBooleanQuery(QueryLanguage ql,
 String query,
 String base)
                                 throws RepositoryException,
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.

query - The query string.

base - 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

prepareGraphQuery

public GraphQuery prepareGraphQuery(QueryLanguage ql,
 String query,
 String base)
                             throws RepositoryException,
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.

query - The query string.

base - 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

prepareTupleQuery

public TupleQuery prepareTupleQuery(QueryLanguage ql,
 String query,
 String base)
                             throws RepositoryException,
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.

query - The query string.

base - 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

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:

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:

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:

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()

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)

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.

Note that if the data contains an embedded base URI, that embedded base URI will overrule the value supplied here (see RFC 3986 section 5.1 for details).

dataFormat - The serialization format of the data. If set to null, the format will be automatically determined by examining the file name extension of the supplied File.

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(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.

Note that if the data contains an embedded base URI, that embedded base URI will overrule the value supplied here (see RFC 3986 section 5.1 for details).

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.

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. May be null.

Note that if the data contains an embedded base URI, that embedded base URI will overrule the value supplied here (see RFC 3986 section 5.1 for details).

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(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. May be null.

Note that if the data contains an embedded base URI, that embedded base URI will overrule the value supplied here (see RFC 3986 section 5.1 for details).

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(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(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. In case the iterable is NamespaceAware and the target repository supports it, the iterable's namespaces are also added to the repository, without overwriting existing ones.

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.

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.

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.

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.

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.

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.

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

Specified by:

setNamespace in class AbstractRepositoryConnection

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.

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

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

addWithoutCommit

protected void addWithoutCommit(Statement st,
 Resource... contexts)
                         throws RepositoryException

Overrides:

addWithoutCommit in class AbstractRepositoryConnection

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

Overrides:

removeWithoutCommit 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

isQuadMode

protected boolean isQuadMode()

Shall graph information also be retrieved, e.g. for getStatements(Resource, IRI, Value, boolean, Resource...)

Returns:

true if in quad mode

isSilentClear

protected boolean isSilentClear()

toStatementIteration

@Deprecated(since="4.1.0",
            forRemoval=true)
protected Iteration<Statement,QueryEvaluationException> toStatementIteration(TupleQueryResult iter,
 Resource subj,
 IRI pred,
 Value obj)

Deprecated, for removal: This API element is subject to removal in a future version.

Converts a TupleQueryResult resulting from the EVERYTHING_WITH_GRAPH to a statement by using the respective values from the BindingSet or (if provided) the ones from the arguments.

Parameters:

iter - the TupleQueryResult

subj - the subject Resource used as input or null if wildcard was used

pred - the predicate IRI used as input or null if wildcard was used

obj - the object Value used as input or null if wildcard was used

Returns:

the converted iteration