Class BinaryRDFWriter

java.lang.Object

org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

org.eclipse.rdf4j.rio.binary.BinaryRDFWriter

All Implemented Interfaces:

ByteSink, Sink, RDFHandler, RDFWriter

public class BinaryRDFWriter
extends AbstractRDFWriter
implements ByteSink

A RDFWriter for the binary RDF format.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	BinaryRDFWriter.ValueMeta	Holds the frequency of a value within the current statementQueue as well as an identifier if any has been assigned.

Field Summary

Fields

Modifier and Type	Field	Description
private int	bufferSize
private Charset	charset
private int	formatVersion
private final Queue<Integer>	idPool
private int	nextId
private final DataOutputStream	out
private boolean	recycleIds
private final Queue<Statement>	statementQueue
private final Map<Value, BinaryRDFWriter.ValueMeta>	valueMeta

Fields inherited from class AbstractRDFWriter

namespaceTable, statementConsumer

Constructor Summary

Constructors

Constructor	Description
BinaryRDFWriter(OutputStream out)
BinaryRDFWriter(OutputStream out, int bufferSize)

Method Summary

Modifier and Type	Method	Description
private void	assignId(Value v, BinaryRDFWriter.ValueMeta meta)
protected void	consumeStatement(Statement st)	Consume a statement.
void	endRDF()	Signals the end of the RDF data.
OutputStream	getOutputStream()	get the OutputStream used by this ByteSink.
RDFFormat	getRDFFormat()	Gets the RDF format that this RDFWriter uses.
Collection<RioSetting<?>>	getSupportedSettings()
void	handleComment(String comment)	Handles a comment.
void	handleNamespace(String prefix, String uri)	Handles a namespace declaration/definition.
private void	handleWriterConfig()
private void	incValueFreq(Value v)
void	startRDF()	Signals the start of the RDF data.
private void	writeBNode(BNode bnode)
private void	writeInt(int i)
private void	writeLiteral(Literal literal)
private void	writeStatement()	Writes the first statement from the statement queue
private void	writeString(String s)
private void	writeTriple(Triple triple)
private void	writeURI(IRI uri)
private void	writeValue(Value value)
private void	writeValueOrId(Value value)

Methods inherited from class AbstractRDFWriter

checkWritingStarted, getFileFormat, getWriterConfig, handleStatement, isWritingStarted, set, setWriterConfig

Methods inherited from class Object

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

Methods inherited from interface Sink

acceptsFileFormat, getFileFormat

Field Details

statementQueue

private final Queue<Statement> statementQueue

bufferSize

private int bufferSize

valueMeta

private final Map<Value, BinaryRDFWriter.ValueMeta> valueMeta

nextId

private int nextId

idPool

private final Queue<Integer> idPool

out

private final DataOutputStream out

formatVersion

private int formatVersion

charset

private Charset charset

recycleIds

private boolean recycleIds

Constructor Details

BinaryRDFWriter

public BinaryRDFWriter(OutputStream out)

BinaryRDFWriter

public BinaryRDFWriter(OutputStream out,
 int bufferSize)

Method Details

getRDFFormat

public RDFFormat getRDFFormat()

Description copied from interface: RDFWriter

Gets the RDF format that this RDFWriter uses.

Specified by:

getRDFFormat in interface RDFWriter

getSupportedSettings

public Collection<RioSetting<?>> getSupportedSettings()

Specified by:

getSupportedSettings in interface RDFWriter

Overrides:

getSupportedSettings in class AbstractRDFWriter

Returns:

A collection of RioSettings that are supported by this RDFWriter.

getOutputStream

public OutputStream getOutputStream()

Description copied from interface: ByteSink

get the OutputStream used by this ByteSink.

Specified by:

getOutputStream in interface ByteSink

Returns:

an OutputStream

startRDF

public void startRDF()
              throws RDFHandlerException

Description copied from interface: RDFHandler

Signals the start of the RDF data. This method is called before any data is reported.

Specified by:

startRDF in interface RDFHandler

Overrides:

startRDF in class AbstractRDFWriter

Throws:

RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

handleWriterConfig

private void handleWriterConfig()

endRDF

public void endRDF()
            throws RDFHandlerException

Description copied from interface: RDFHandler

Signals the end of the RDF data. This method is called when all data has been reported.

Specified by:

endRDF in interface RDFHandler

Throws:

RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

handleNamespace

public void handleNamespace(String prefix,
 String uri)
                     throws RDFHandlerException

Description copied from interface: RDFHandler

Handles a namespace declaration/definition. A namespace declaration associates a (short) prefix string with the namespace's URI. The prefix for default namespaces, which do not have an associated prefix, are represented as empty strings.

Specified by:

handleNamespace in interface RDFHandler

Overrides:

handleNamespace in class AbstractRDFWriter

Parameters:

prefix - The prefix for the namespace, or an empty string in case of a default namespace.

uri - The URI that the prefix maps to.

Throws:

RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

handleComment

public void handleComment(String comment)
                   throws RDFHandlerException

Description copied from interface: RDFHandler

Handles a comment.

Specified by:

handleComment in interface RDFHandler

Parameters:

comment - The comment.

Throws:

RDFHandlerException - If the RDF handler has encountered an unrecoverable error.

consumeStatement

protected void consumeStatement(Statement st)

Description copied from class: AbstractRDFWriter

Consume a statement.

Extending classes must override this method instead of overriding AbstractRDFWriter.handleStatement(Statement) in order to benefit from automatic handling of RDF-star conversion or encoding.

Overrides:

consumeStatement in class AbstractRDFWriter

Parameters:

st - the statement to consume.

writeStatement

private void writeStatement()
                     throws RDFHandlerException,
IOException

Writes the first statement from the statement queue

Throws:

RDFHandlerException

IOException

incValueFreq

private void incValueFreq(Value v)

assignId

private void assignId(Value v,
 BinaryRDFWriter.ValueMeta meta)

writeValueOrId

private void writeValueOrId(Value value)
                     throws RDFHandlerException,
IOException

Throws:

RDFHandlerException

IOException

writeValue

private void writeValue(Value value)
                 throws RDFHandlerException,
IOException

Throws:

RDFHandlerException

IOException

writeURI

private void writeURI(IRI uri)
               throws IOException

Throws:

IOException

writeBNode

private void writeBNode(BNode bnode)
                 throws IOException

Throws:

IOException

writeLiteral

private void writeLiteral(Literal literal)
                   throws IOException

Throws:

IOException

writeTriple

private void writeTriple(Triple triple)
                  throws IOException

Throws:

IOException

writeString

private void writeString(String s)
                  throws IOException

Throws:

IOException

writeInt

private void writeInt(int i)
               throws IOException

Throws:

IOException