Package org.eclipse.rdf4j.rio.rdfxml

Class RDFXMLWriter

java.lang.Object

org.eclipse.rdf4j.rio.helpers.AbstractRDFWriter

org.eclipse.rdf4j.rio.rdfxml.RDFXMLWriter

All Implemented Interfaces:

CharSink, Sink, RDFHandler, RDFWriter

Direct Known Subclasses:

RDFXMLPrettyWriter

public class RDFXMLWriter
extends AbstractRDFWriter
implements CharSink

An implementation of the RDFWriter interface that writes RDF documents in XML-serialized RDF format.

Field Summary

Fields

Modifier and Type	Field	Description
protected final ParsedIRI	baseIRI
protected String	defaultNamespace
protected boolean	entityQuote
protected boolean	headerWritten
protected Resource	lastWrittenSubject
protected char	quote
protected final Writer	writer

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

namespaceTable, statementConsumer

Constructor Summary

Constructors

Constructor	Description
RDFXMLWriter(OutputStream out)	Creates a new RDFXMLWriter that will write to the supplied OutputStream.
RDFXMLWriter(OutputStream out, ParsedIRI baseIRI)	Creates a new RDFXMLWriter that will write to the supplied OutputStream.
RDFXMLWriter(Writer writer)	Creates a new RDFXMLWriter that will write to the supplied Writer.
RDFXMLWriter(Writer writer, ParsedIRI baseIRI)	Creates a new RDFXMLWriter that will write to the supplied Writer.

Method Summary

Modifier and Type	Method	Description
protected void	consumeStatement(Statement st)	Consume a statement.
void	endRDF()	Signals the end of the RDF data.
protected void	flushPendingStatements()
RDFFormat	getRDFFormat()	Gets the RDF format that this RDFWriter uses.
Collection<RioSetting<?>>	getSupportedSettings()
protected String	getValidNodeId(BNode bNode)	Create a syntactically valid node id from the supplied blank node id.
Writer	getWriter()	get the Writer used by this CharSink.
void	handleComment(String comment)	Handles a comment.
void	handleNamespace(String prefix, String name)	Handles a namespace declaration/definition.
protected void	setNamespace(String prefix, String name)
protected void	writeAttribute(String attName, String value)
protected void	writeAttribute(String namespace, String attName, String value)
protected void	writeCharacterData(String chars)	Replace special characters in text with entities.
protected void	writeEndOfEmptyTag()	Write > or />
protected void	writeEndOfStartTag()	Write >
protected void	writeEndTag(String namespace, String localName)
protected void	writeHeader()
protected void	writeIndent()	Write tab
protected void	writeNewLine()	Write newline character
protected void	writeQuotedAttribute(String attName, String value)	Write quoted attribute
protected void	writeStartOfStartTag(String namespace, String localName)

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

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

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

Field Details

baseIRI

protected final ParsedIRI baseIRI

writer

protected final Writer writer

defaultNamespace

protected String defaultNamespace

headerWritten

protected boolean headerWritten

lastWrittenSubject

protected Resource lastWrittenSubject

quote

protected char quote

entityQuote

protected boolean entityQuote

Constructor Details

RDFXMLWriter

public RDFXMLWriter(OutputStream out)

Creates a new RDFXMLWriter that will write to the supplied OutputStream.

Parameters:

out - The OutputStream to write the RDF/XML document to.

RDFXMLWriter

public RDFXMLWriter(OutputStream out,
 ParsedIRI baseIRI)

Creates a new RDFXMLWriter that will write to the supplied OutputStream.

Parameters:

out - The OutputStream to write the RDF/XML document to.

baseIRI - base URI

RDFXMLWriter

public RDFXMLWriter(Writer writer)

Creates a new RDFXMLWriter that will write to the supplied Writer.

Parameters:

writer - The Writer to write the RDF/XML document to.

RDFXMLWriter

public RDFXMLWriter(Writer writer,
 ParsedIRI baseIRI)

Creates a new RDFXMLWriter that will write to the supplied Writer.

Parameters:

writer - The Writer to write the RDF/XML document to.

baseIRI - base URI

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

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

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.

writeHeader

protected void writeHeader()
                    throws IOException

Throws:

IOException

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 name)

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.

name - The URI that the prefix maps to.

setNamespace

protected void setNamespace(String prefix,
 String name)

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.

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.

flushPendingStatements

protected void flushPendingStatements()
                               throws IOException,
RDFHandlerException

Throws:

IOException

RDFHandlerException

writeStartOfStartTag

protected void writeStartOfStartTag(String namespace,
 String localName)
                             throws IOException

Throws:

IOException

writeAttribute

protected void writeAttribute(String attName,
 String value)
                       throws IOException

Throws:

IOException

writeAttribute

protected void writeAttribute(String namespace,
 String attName,
 String value)
                       throws IOException,
RDFHandlerException

Throws:

IOException

RDFHandlerException

writeQuotedAttribute

protected void writeQuotedAttribute(String attName,
 String value)
                             throws IOException

Write quoted attribute

Parameters:

attName - attribute name

value - string value

Throws:

IOException

writeEndOfStartTag

protected void writeEndOfStartTag()
                           throws IOException

Write >

Throws:

IOException

writeEndOfEmptyTag

protected void writeEndOfEmptyTag()
                           throws IOException

Write > or />

Throws:

IOException

writeEndTag

protected void writeEndTag(String namespace,
 String localName)
                    throws IOException

Throws:

IOException

writeCharacterData

protected void writeCharacterData(String chars)
                           throws IOException

Replace special characters in text with entities.

Parameters:

chars - text

Throws:

IOException

writeIndent

protected void writeIndent()
                    throws IOException

Write tab

Throws:

IOException

writeNewLine

protected void writeNewLine()
                     throws IOException

Write newline character

Throws:

IOException

getValidNodeId

protected String getValidNodeId(BNode bNode)
                         throws IOException

Create a syntactically valid node id from the supplied blank node id. This is necessary because RDF/XML syntax enforces the blank node id is a valid NCName.

Parameters:

bNode - a blank node identifier

Returns:

the blank node identifier converted to a form that is a valid NCName.

Throws:

IOException

See Also:

• section 7.2.34 of the RDF/XML Syntax specification