Package org.eclipse.rdf4j.rio.helpers

Class AbstractRDFWriter

java.lang.Object

org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

All Implemented Interfaces:

Sink, RDFHandler, RDFWriter

Direct Known Subclasses:

BinaryRDFWriter, ConsoleRDFWriter, JSONLDWriter, JSONLDWriter, NDJSONLDWriter, NDJSONLDWriter, NTriplesWriter, RDFJSONWriter, RDFXMLWriter, TriXWriter, TurtleWriter

public abstract class AbstractRDFWriter
extends Object
implements RDFWriter, Sink

Base class for RDFWriters offering common functionality for RDF writers.

Author:

Peter Ansell

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<String,String>	namespaceTable	Mapping from namespace prefixes to namespace names.
protected Consumer<Statement>	statementConsumer

Constructor Summary

Constructors

Constructor	Description
AbstractRDFWriter()

Method Summary

Modifier and Type	Method	Description
protected void	checkWritingStarted()	Verify that writing has started.
protected void	consumeStatement(Statement st)	Consume a statement.
FileFormat	getFileFormat()	Get the FileFormat this sink uses.
Collection<RioSetting<?>>	getSupportedSettings()
WriterConfig	getWriterConfig()	Retrieves the current writer configuration as a single object.
void	handleNamespace(String prefix, String uri)	Handles a namespace declaration/definition.
void	handleStatement(Statement st)	Handles a statement.
protected boolean	isWritingStarted()	See if writing has started
<T> RDFWriter	set(RioSetting<T> setting, T value)	Set a setting on the writer, and return this writer object to allow chaining.
RDFWriter	setWriterConfig(WriterConfig config)	Sets all supplied writer configuration options.
void	startRDF()	Signals the start of the RDF data.

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.rio.RDFHandler

endRDF, handleComment

Methods inherited from interface org.eclipse.rdf4j.rio.RDFWriter

getRDFFormat

Methods inherited from interface org.eclipse.rdf4j.common.io.Sink

acceptsFileFormat

Field Details

namespaceTable

protected Map<String,String> namespaceTable

Mapping from namespace prefixes to namespace names.

statementConsumer

protected Consumer<Statement> statementConsumer

Constructor Details

AbstractRDFWriter

public AbstractRDFWriter()

Method Details

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

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.

setWriterConfig

public RDFWriter setWriterConfig(WriterConfig config)

Description copied from interface: RDFWriter

Sets all supplied writer configuration options.

Specified by:

setWriterConfig in interface RDFWriter

Parameters:

config - a writer configuration object.

Returns:

Either a copy of this writer, if it is immutable, or this object, to allow chaining of method calls.

getWriterConfig

public WriterConfig getWriterConfig()

Description copied from interface: RDFWriter

Retrieves the current writer configuration as a single object.

Specified by:

getWriterConfig in interface RDFWriter

Returns:

a writer configuration object representing the current configuration of the writer.

getFileFormat

public FileFormat getFileFormat()

Description copied from interface: Sink

Get the FileFormat this sink uses.

Specified by:

getFileFormat in interface Sink

Returns:

a FileFormat. May not be null.

getSupportedSettings

public Collection<RioSetting<?>> getSupportedSettings()

Specified by:

getSupportedSettings in interface RDFWriter

Returns:

A collection of RioSettings that are supported by this RDFWriter.

set

public <T> RDFWriter set(RioSetting<T> setting,
 T value)

Description copied from interface: RDFWriter

Set a setting on the writer, and return this writer object to allow chaining.

Specified by:

set in interface RDFWriter

Parameters:

setting - The setting to change.

value - The value to change.

Returns:

Either a copy of this writer, if it is immutable, or this object, to allow chaining of method calls.

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

Throws:

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

handleStatement

public void handleStatement(Statement st)
                     throws RDFHandlerException

Description copied from interface: RDFHandler

Handles a statement.

Specified by:

handleStatement in interface RDFHandler

Parameters:

st - The statement.

Throws:

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

consumeStatement

protected void consumeStatement(Statement st)

Consume a statement.

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

Parameters:

st - the statement to consume.

isWritingStarted

protected boolean isWritingStarted()

See if writing has started

Returns:

true if writing has started, false otherwise

checkWritingStarted

protected void checkWritingStarted()

Verify that writing has started.

Throws:

RDFHandlerException - if writing has not yet started.