Package org.eclipse.rdf4j.rio.rdfjson

Class RDFJSONWriter

java.lang.Object

org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

org.eclipse.rdf4j.rio.rdfjson.RDFJSONWriter

All Implemented Interfaces:

CharSink, Sink, RDFHandler, RDFWriter

public class RDFJSONWriter
extends AbstractRDFWriter
implements CharSink

RDFWriter implementation for the RDF/JSON format

Author:

Peter Ansell p_ansell@yahoo.com

Field Summary

Fields inherited from class org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

namespaceTable, statementConsumer

Constructor Summary

Constructors

Constructor	Description
RDFJSONWriter(OutputStream out, RDFFormat actualFormat)
RDFJSONWriter(Writer writer, RDFFormat actualFormat)

Method Summary

Modifier and Type	Method	Description
void	consumeStatement(Statement statement)	Consume a statement.
void	endRDF()	Signals the end of the RDF data.
RDFFormat	getRDFFormat()	Gets the RDF format that this RDFWriter uses.
Collection<RioSetting<?>>	getSupportedSettings()
Writer	getWriter()	get the Writer used by this CharSink.
void	handleComment(String comment)	Handles a comment.
void	handleNamespace(String prefix, String uri)	Handles a namespace declaration/definition.
static void	modelToRdfJsonInternal(Model graph, WriterConfig writerConfig, com.fasterxml.jackson.core.JsonGenerator jg)
static String	resourceToString(Resource uriOrBnode)	Returns the correct syntax for a Resource, depending on whether it is a URI or a Blank Node (ie, BNode)
void	startRDF()	Signals the start of the RDF data.
static void	writeObject(Value object, Set<Resource> contexts, com.fasterxml.jackson.core.JsonGenerator jg)	Helper method to reduce complexity of the JSON serialisation algorithm Any null contexts will only be serialised to JSON if there are also non-null contexts in the contexts array

Methods inherited from class org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

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

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.common.io.Sink

acceptsFileFormat, getFileFormat

Constructor Detail

RDFJSONWriter

public RDFJSONWriter(OutputStream out,
                     RDFFormat actualFormat)

RDFJSONWriter

public RDFJSONWriter(Writer writer,
                     RDFFormat actualFormat)

Method Detail

getWriter

public Writer getWriter()

Description copied from interface: CharSink

get the Writer used by this CharSink.

Specified by:

getWriter in interface CharSink

Returns:

an Writer

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.

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.

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.

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.

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.

consumeStatement

public void consumeStatement(Statement statement)
                      throws RDFHandlerException

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:

statement - the statement to consume.

Throws:

RDFHandlerException

writeObject

public static void writeObject(Value object,
                               Set<Resource> contexts,
                               com.fasterxml.jackson.core.JsonGenerator jg)
                        throws com.fasterxml.jackson.core.JsonGenerationException,
                               IOException

Helper method to reduce complexity of the JSON serialisation algorithm Any null contexts will only be serialised to JSON if there are also non-null contexts in the contexts array

Parameters:

object - The RDF value to serialise

contexts - The set of contexts that are relevant to this object, including null contexts as they are found.

jg - the JsonGenerator to write to.

Throws:

IOException

com.fasterxml.jackson.core.JsonGenerationException

resourceToString

public static String resourceToString(Resource uriOrBnode)

Returns the correct syntax for a Resource, depending on whether it is a URI or a Blank Node (ie, BNode)

Parameters:

uriOrBnode - The resource to serialise to a string

Returns:

The string value of the RDF4J resource

modelToRdfJsonInternal

public static void modelToRdfJsonInternal(Model graph,
                                          WriterConfig writerConfig,
                                          com.fasterxml.jackson.core.JsonGenerator jg)
                                   throws IOException

Throws:

IOException