org.apache.any23.extractor.rdfa
Class RDFaExtractor

java.lang.Object
  org.apache.any23.extractor.rdfa.RDFaExtractor

All Implemented Interfaces:

Extractor<Document>, Extractor.TagSoupDOMExtractor

public class RDFaExtractor
extends Object
implements Extractor.TagSoupDOMExtractor

Extractor for RDFa in HTML, based on Fabien Gadon's XSLT transform, found here. It works by first parsing the HTML using a tagsoup parser, then applies the XSLT to the DOM tree, then parses the resulting RDF/XML.

Author:

Gabriele Renzi, Richard Cyganiak (richard@cyganiak.de)

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.any23.extractor.Extractor

Extractor.BlindExtractor, Extractor.ContentExtractor, Extractor.TagSoupDOMExtractor

Field Summary

static ExtractorFactory<RDFaExtractor>	factory
static String	NAME
static String	xsltFilename

Constructor Summary

RDFaExtractor()
Default constructor, with no verification of data types and not stop at first error.

RDFaExtractor(boolean verifyDataType, boolean stopAtFirstError)
Constructor, allows to specify the validation and error handling policies.

Method Summary

ExtractorDescription	getDescription() Returns a ExtractorDescription of this extractor.
static XSLTStylesheet	getXSLT() Returns a XSLTStylesheet able to distill RDFa from HTML pages.
boolean	isStopAtFirstError()
boolean	isVerifyDataType()
void	run(ExtractionParameters extractionParameters, ExtractionContext extractionContext, Document in, ExtractionResult out) Executes the extractor.
void	setStopAtFirstError(boolean stopAtFirstError)
void	setVerifyDataType(boolean verifyDataType)

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

xsltFilename

public static final String xsltFilename

factory

public static final ExtractorFactory<RDFaExtractor> factory

Constructor Detail

RDFaExtractor

public RDFaExtractor(boolean verifyDataType,
                     boolean stopAtFirstError)

Constructor, allows to specify the validation and error handling policies.

Parameters:

verifyDataType - if true the data types will be verified, if false will be ignored.

stopAtFirstError - if true the parser will stop at first parsing error, if false will ignore non blocking errors.

RDFaExtractor

public RDFaExtractor()

Default constructor, with no verification of data types and not stop at first error.

Method Detail

getXSLT

public static XSLTStylesheet getXSLT()

Returns a XSLTStylesheet able to distill RDFa from HTML pages.

Returns:

returns a not null XSLT instance.

isVerifyDataType

public boolean isVerifyDataType()

setVerifyDataType

public void setVerifyDataType(boolean verifyDataType)

isStopAtFirstError

public boolean isStopAtFirstError()

setStopAtFirstError

public void setStopAtFirstError(boolean stopAtFirstError)

run

public void run(ExtractionParameters extractionParameters,
                ExtractionContext extractionContext,
                Document in,
                ExtractionResult out)
         throws IOException,
                ExtractionException

Description copied from interface: Extractor

Executes the extractor. Will be invoked only once, extractors are not reusable.

Specified by:

run in interface Extractor<Document>

Parameters:

extractionParameters - the parameters to be applied during the extraction.

extractionContext - The document context.

in - The extractor input data.

out - the collector for the extracted data.

Throws:

IOException - On error while reading from the input stream.

ExtractionException - On other error, such as parse errors.

getDescription

public ExtractorDescription getDescription()

Description copied from interface: Extractor

Returns a ExtractorDescription of this extractor.

Specified by:

getDescription in interface Extractor<Document>

Returns:

the ExtractorDescription of this extractor