Package cz.vutbr.fit.layout.rdf

Class RDFStorage

java.lang.Object

cz.vutbr.fit.layout.rdf.RDFStorage

All Implemented Interfaces:

Closeable, AutoCloseable

public class RDFStorage
extends Object
implements Closeable

This class provides an abstraction of an RDF repository and implements the common low-level operations.

Author:

burgetr

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RDFStorage(org.eclipse.rdf4j.repository.Repository repo)	Use the create functions for creating the instances.

Method Summary

Modifier and Type	Method	Description
void	add(org.eclipse.rdf4j.model.IRI subj, org.eclipse.rdf4j.model.IRI pred, org.eclipse.rdf4j.model.IRI obj, org.eclipse.rdf4j.model.IRI context)	Adds a new quadruple to the storage.
void	addNamespace(String prefix, String namespace)
void	addValue(org.eclipse.rdf4j.model.IRI subj, org.eclipse.rdf4j.model.IRI pred, Object value, org.eclipse.rdf4j.model.IRI context)	Adds a new data quadruple to the storage.
void	clear()	Clears the entire RDF repository.
void	clear(org.eclipse.rdf4j.model.IRI context)	Clears the entire RDF repository.
void	clearNamespaces()
void	close()
static RDFStorage	create(org.eclipse.rdf4j.repository.Repository repo)
static RDFStorage	createHTTP(String serverUrl, String repositoryId)
static RDFStorage	createMemory(String dataDir)
static RDFStorage	createNative(String dataDir)
void	deleteNamespace(String prefix)
void	execSparqlUpdate(String query)
org.eclipse.rdf4j.model.Model	executeSafeQuery(String query)	Executes an internal (safe) SPARQL graph query.
List<org.eclipse.rdf4j.query.BindingSet>	executeSafeTupleQuery(String query)	Executes an internal (safe) tuple query.
org.eclipse.rdf4j.repository.RepositoryConnection	getConnection()
org.eclipse.rdf4j.model.Model	getContextModel(Collection<org.eclipse.rdf4j.model.Resource> contexts)	Obtains a model containing all statements in a given context.
org.eclipse.rdf4j.model.Model	getContextModel(org.eclipse.rdf4j.model.Resource context)	Obtains a model containing all statements in a given context.
long	getLastSequenceValue(org.eclipse.rdf4j.model.IRI sequenceIri)	Obtains the last assigned value of a sequence with the given name.
String	getNamespace(String prefix)
List<org.eclipse.rdf4j.model.Namespace>	getNamespaces()
long	getNextSequenceValue(org.eclipse.rdf4j.model.IRI sequenceIri)
org.eclipse.rdf4j.model.Value	getPropertyValue(org.eclipse.rdf4j.model.Resource subject, org.eclipse.rdf4j.model.IRI predicate)	Obtains the value of the given predicate for the given subject.
org.eclipse.rdf4j.repository.Repository	getRepository()
org.eclipse.rdf4j.model.Model	getSubjectModel(org.eclipse.rdf4j.model.Resource subject)	Obtains a model for the specific subject.
org.eclipse.rdf4j.model.IRI	getSubjectType(org.eclipse.rdf4j.model.Resource subject)	Determines the type of the subject as determined by the corresponding rdf:type predicate (if present)
org.eclipse.rdf4j.model.ValueFactory	getValueFactory()
void	importTurtle(String query)
void	importTurtle(String query, org.eclipse.rdf4j.model.IRI context)
void	importXML(String query)
void	importXML(String query, org.eclipse.rdf4j.model.IRI context)
void	insertGraph(org.eclipse.rdf4j.model.Model graph)	Inserts a new graph to the database.
void	insertGraph(org.eclipse.rdf4j.model.Model graph, org.eclipse.rdf4j.model.IRI contextIri)	Inserts a new graph to the database.
void	queryExportCSV(String queryString, OutputStream ostream)

Methods inherited from class java.lang.Object

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

Constructor Detail

RDFStorage

protected RDFStorage(org.eclipse.rdf4j.repository.Repository repo)

Use the create functions for creating the instances.

Method Detail

create

public static RDFStorage create(org.eclipse.rdf4j.repository.Repository repo)

createMemory

public static RDFStorage createMemory(String dataDir)

createNative

public static RDFStorage createNative(String dataDir)

createHTTP

public static RDFStorage createHTTP(String serverUrl,
                                    String repositoryId)

getRepository

public org.eclipse.rdf4j.repository.Repository getRepository()

getValueFactory

public org.eclipse.rdf4j.model.ValueFactory getValueFactory()

getConnection

public org.eclipse.rdf4j.repository.RepositoryConnection getConnection()

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

getPropertyValue

public org.eclipse.rdf4j.model.Value getPropertyValue(org.eclipse.rdf4j.model.Resource subject,
                                                      org.eclipse.rdf4j.model.IRI predicate)
                                               throws StorageException

Obtains the value of the given predicate for the given subject.

Parameters:

subject - the subject resource

predicate - the predicate IRI

Returns:

the resulting Value or null when there is no corresponding triplet available.

Throws:

StorageException

getSubjectModel

public org.eclipse.rdf4j.model.Model getSubjectModel(org.eclipse.rdf4j.model.Resource subject)
                                              throws StorageException

Obtains a model for the specific subject.

Parameters:

subject -

Returns:

Throws:

StorageException

getSubjectType

public org.eclipse.rdf4j.model.IRI getSubjectType(org.eclipse.rdf4j.model.Resource subject)
                                           throws StorageException

Determines the type of the subject as determined by the corresponding rdf:type predicate (if present)

Parameters:

subject - the subject IRI

Returns:

the type IRI or null when the type is not defined

Throws:

StorageException

getContextModel

public org.eclipse.rdf4j.model.Model getContextModel(org.eclipse.rdf4j.model.Resource context)
                                              throws StorageException

Obtains a model containing all statements in a given context.

Parameters:

context - the context IRI

Returns:

Throws:

StorageException

getContextModel

public org.eclipse.rdf4j.model.Model getContextModel(Collection<org.eclipse.rdf4j.model.Resource> contexts)
                                              throws StorageException

Obtains a model containing all statements in a given context.

Parameters:

contexts - the context IRIs

Returns:

Throws:

StorageException

executeSafeQuery

public org.eclipse.rdf4j.model.Model executeSafeQuery(String query)
                                               throws StorageException

Executes an internal (safe) SPARQL graph query.

Parameters:

query - the SPARQL query

Returns:

a the resulting model

Throws:

StorageException

executeSafeTupleQuery

public List<org.eclipse.rdf4j.query.BindingSet> executeSafeTupleQuery(String query)
                                                               throws StorageException

Executes an internal (safe) tuple query.

Parameters:

query -

Returns:

a list of binding sets object representing the result

Throws:

StorageException

add

public void add(org.eclipse.rdf4j.model.IRI subj,
                org.eclipse.rdf4j.model.IRI pred,
                org.eclipse.rdf4j.model.IRI obj,
                org.eclipse.rdf4j.model.IRI context)

Adds a new quadruple to the storage.

Parameters:

subj -

pred -

obj -

context -

addValue

public void addValue(org.eclipse.rdf4j.model.IRI subj,
                     org.eclipse.rdf4j.model.IRI pred,
                     Object value,
                     org.eclipse.rdf4j.model.IRI context)

Adds a new data quadruple to the storage.

Parameters:

subj -

pred -

value -

context -

insertGraph

public void insertGraph(org.eclipse.rdf4j.model.Model graph)
                 throws StorageException

Inserts a new graph to the database.

Parameters:

graph -

Throws:

StorageException

insertGraph

public void insertGraph(org.eclipse.rdf4j.model.Model graph,
                        org.eclipse.rdf4j.model.IRI contextIri)
                 throws StorageException

Inserts a new graph to the database.

Parameters:

graph -

contextIri - the context to be used for the inserted statements

Throws:

StorageException

clear

public void clear()
           throws StorageException

Clears the entire RDF repository.

Throws:

StorageException

clear

public void clear(org.eclipse.rdf4j.model.IRI context)
           throws StorageException

Clears the entire RDF repository.

Throws:

StorageException

execSparqlUpdate

public void execSparqlUpdate(String query)
                      throws StorageException

Throws:

StorageException

importTurtle

public void importTurtle(String query)
                  throws StorageException,
                         IOException

Throws:

StorageException

IOException

importTurtle

public void importTurtle(String query,
                         org.eclipse.rdf4j.model.IRI context)
                  throws StorageException,
                         IOException

Throws:

StorageException

IOException

importXML

public void importXML(String query)
               throws StorageException,
                      IOException

Throws:

StorageException

IOException

importXML

public void importXML(String query,
                      org.eclipse.rdf4j.model.IRI context)
               throws StorageException,
                      IOException

Throws:

StorageException

IOException

queryExportCSV

public void queryExportCSV(String queryString,
                           OutputStream ostream)
                    throws StorageException

Throws:

StorageException

getLastSequenceValue

public long getLastSequenceValue(org.eclipse.rdf4j.model.IRI sequenceIri)
                          throws StorageException

Obtains the last assigned value of a sequence with the given name.

Parameters:

sequenceIri - the sequence IRI

Returns:

the last assigned value or 0 when the sequence does not exist.

Throws:

StorageException

getNextSequenceValue

public long getNextSequenceValue(org.eclipse.rdf4j.model.IRI sequenceIri)
                          throws StorageException

Throws:

StorageException

getNamespaces

public List<org.eclipse.rdf4j.model.Namespace> getNamespaces()

getNamespace

public String getNamespace(String prefix)

addNamespace

public void addNamespace(String prefix,
                         String namespace)

deleteNamespace

public void deleteNamespace(String prefix)

clearNamespaces

public void clearNamespaces()