Package org.eclipse.rdf4j.repository.http

Class HTTPRepository

java.lang.Object

org.eclipse.rdf4j.repository.base.AbstractRepository

org.eclipse.rdf4j.repository.http.HTTPRepository

All Implemented Interfaces:

HttpClientDependent, SessionManagerDependent, Repository

public class HTTPRepository
extends AbstractRepository
implements HttpClientDependent, SessionManagerDependent

A repository that serves as a client for a remote repository on an RDF4J Server. Methods in this class may throw the specific RepositoryException subclass UnauthorizedException, the semantics of which is defined by the HTTP protocol.

This repository client uses a RDF4J-specific extension of the SPARQL 1.1 Protocol to communicate with the server. For communicating with a SPARQL endpoint that is not based on RDF4J, it is recommended to use SPARQLRepository instead.

Author:

Arjohn Kampman, Jeen Broekstra, Herko ter Horst

See Also:

• UnauthorizedException

Field Summary

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

logger

Constructor Summary

Constructors

Constructor	Description
HTTPRepository(String repositoryURL)
HTTPRepository(String serverURL, String repositoryID)

Method Summary

Modifier and Type	Method	Description
protected RDF4JProtocolSession	createHTTPClient()	Creates a new RDF4JProtocolSession object.
Map<String,String>	getAdditionalHttpHeaders()	Get the additional HTTP headers which will be used
RepositoryConnection	getConnection()	Opens a connection to this repository that can be used for querying and updating the contents of the repository.
File	getDataDir()	Get the directory where data and logging for this repository is stored.
final 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.
RDFFormat	getPreferredRDFFormat()	Indicates the current preferred RDFFormat.
TupleQueryResultFormat	getPreferredTupleQueryResultFormat()	Indicates the current preferred TupleQueryResultFormat.
String	getRepositoryURL()
ValueFactory	getValueFactory()	Gets a ValueFactory for this Repository.
protected void	initializeInternal()
boolean	isWritable()	Checks whether this repository is writable, i.e.
void	setAdditionalHttpHeaders(Map<String,String> additionalHttpHeaders)	Set additional HTTP headers to be included in every request to the server, which may be required for certain unusual server configurations.
void	setDataDir(File dataDir)	Set the directory where data and logging for this repository is stored.
void	setHttpClient(org.apache.http.client.HttpClient httpClient)	Assign an HttpClient that this object should use.
void	setHttpClientSessionManager(HttpClientSessionManager client)	Assign an HttpClientSessionManager that this object should use.
void	setPreferredRDFFormat(RDFFormat format)	Sets the preferred serialization format for RDF to the supplied RDFFormat, overriding the SPARQLProtocolSession's default preference.
void	setPreferredTupleQueryResultFormat(TupleQueryResultFormat format)	Sets the preferred serialization format for tuple query results to the supplied TupleQueryResultFormat, overriding the SPARQLProtocolSession 's default preference.
void	setUsernameAndPassword(String username, String password)	Set the username and password to use for authenticating with the remote repository.
protected void	shutDownInternal()

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

init, isInitialized, shutDown

Methods inherited from class java.lang.Object

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

Constructor Details

HTTPRepository

public HTTPRepository(String serverURL,
 String repositoryID)

HTTPRepository

public HTTPRepository(String repositoryURL)

Method Details

setDataDir

public void setDataDir(File dataDir)

Description copied from interface: Repository

Set the directory where data and logging for this repository is stored.

Specified by:

setDataDir in interface Repository

Parameters:

dataDir - the directory where data for this repository is stored

getDataDir

public File getDataDir()

Description copied from interface: Repository

Get the directory where data and logging for this repository is stored.

Specified by:

getDataDir in interface Repository

Returns:

the directory where data for this repository is stored.

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 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 SessionManagerDependent

Parameters:

client -

getAdditionalHttpHeaders

public Map<String,String> getAdditionalHttpHeaders()

Get the additional HTTP headers which will be used

Returns:

a read-only view of the additional HTTP headers which will be included in every request to the server.

setAdditionalHttpHeaders

public void setAdditionalHttpHeaders(Map<String,String> additionalHttpHeaders)

Set additional HTTP headers to be included in every request to the server, which may be required for certain unusual server configurations. This will only take effect on connections subsequently returned by getConnection().

Parameters:

additionalHttpHeaders - a map containing pairs of header names and values. May be null

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 -

getValueFactory

public ValueFactory getValueFactory()

Description copied from interface: Repository

Gets a ValueFactory for this Repository.

Specified by:

getValueFactory in interface Repository

Returns:

A repository-specific ValueFactory.

getConnection

public RepositoryConnection getConnection()
                                   throws RepositoryException

Description copied from interface: Repository

Opens a connection to this repository that can be used for querying and updating the contents of the repository. Created connections need to be closed to make sure that any resources they keep hold of are released. The best way to do this is to use a try-with-resources block, as follows:

 try (RepositoryConnection conn = repository.getConnection()) {
        // perform operations on the connection
 }
 

Note that RepositoryConnection is not guaranteed to be thread-safe! The recommended pattern for repository access in a multi-threaded application is to share the Repository object between threads, but have each thread create and use its own RepositoryConnections.

Specified by:

getConnection in interface Repository

Returns:

A connection that allows operations on this repository.

Throws:

RepositoryException - If something went wrong during the creation of the Connection.

isWritable

public boolean isWritable()
                   throws RepositoryException

Description copied from interface: Repository

Checks whether this repository is writable, i.e. if the data contained in this repository can be changed. The writability of the repository is determined by the writability of the Sail that this repository operates on.

Specified by:

isWritable in interface Repository

Throws:

RepositoryException

setPreferredTupleQueryResultFormat

public void setPreferredTupleQueryResultFormat(TupleQueryResultFormat format)

Sets the preferred serialization format for tuple query results to the supplied TupleQueryResultFormat, overriding the SPARQLProtocolSession 's default preference. Setting this parameter is not necessary in most cases as the SPARQLProtocolSession by default indicates a preference for the most compact and efficient format available.

Parameters:

format - the preferred TupleQueryResultFormat. If set to 'null' no explicit preference will be stated.

getPreferredTupleQueryResultFormat

public TupleQueryResultFormat getPreferredTupleQueryResultFormat()

Indicates the current preferred TupleQueryResultFormat.

Returns:

The preferred format, of 'null' if no explicit preference is defined.

setPreferredRDFFormat

public void setPreferredRDFFormat(RDFFormat format)

Sets the preferred serialization format for RDF to the supplied RDFFormat, overriding the SPARQLProtocolSession's default preference. Setting this parameter is not necessary in most cases as the SPARQLProtocolSession by default indicates a preference for the most compact and efficient format available.

Use with caution: if set to a format that does not support context serialization any context info contained in the query result will be lost.

Parameters:

format - the preferred RDFFormat. If set to 'null' no explicit preference will be stated.

getPreferredRDFFormat

public RDFFormat getPreferredRDFFormat()

Indicates the current preferred RDFFormat.

Returns:

The preferred format, of 'null' if no explicit preference is defined.

setUsernameAndPassword

public void setUsernameAndPassword(String username,
 String password)

Set the username and password to use for authenticating with the remote repository.

Parameters:

username - the username. Setting this to null will disable authentication.

password - the password. Setting this to null will disable authentication.

getRepositoryURL

public String getRepositoryURL()

initializeInternal

protected void initializeInternal()
                           throws RepositoryException

Specified by:

initializeInternal in class AbstractRepository

Throws:

RepositoryException

shutDownInternal

protected void shutDownInternal()
                         throws RepositoryException

Specified by:

shutDownInternal in class AbstractRepository

Throws:

RepositoryException

createHTTPClient

protected RDF4JProtocolSession createHTTPClient()

Creates a new RDF4JProtocolSession object.

Returns:

a RDF4JProtocolSession object.