org.apache.tika.parser

Class CompositeParser

java.lang.Object

org.apache.tika.parser.AbstractParser

org.apache.tika.parser.CompositeParser

All Implemented Interfaces:

Serializable, Parser

Direct Known Subclasses:

AutoDetectParser, CompositeExternalParser, DefaultParser

public class CompositeParser
extends AbstractParser

Composite parser that delegates parsing tasks to a component parser based on the declared content type of the incoming document. A fallback parser is defined for cases where a parser for the given content type is not available.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CompositeParser()
CompositeParser(MediaTypeRegistry registry, List<Parser> parsers)
CompositeParser(MediaTypeRegistry registry, List<Parser> parsers, Collection<Class<? extends Parser>> excludeParsers)
CompositeParser(MediaTypeRegistry registry, Parser... parsers)

Method Summary

Modifier and Type	Method and Description
Map<MediaType,List<Parser>>	findDuplicateParsers(ParseContext context) Utility method that goes through all the component parsers and finds all media types for which more than one parser declares support.
List<Parser>	getAllComponentParsers() Returns all parsers registered with the Composite Parser, including ones which may not currently be active.
Parser	getFallback() Returns the fallback parser.
MediaTypeRegistry	getMediaTypeRegistry() Returns the media type registry used to infer type relationships.
protected Parser	getParser(Metadata metadata) Returns the parser that best matches the given metadata.
protected Parser	getParser(Metadata metadata, ParseContext context)
Map<MediaType,Parser>	getParsers() Returns the component parsers.
Map<MediaType,Parser>	getParsers(ParseContext context)
Set<MediaType>	getSupportedTypes(ParseContext context) Returns the set of media types supported by this parser when used with the given parse context.
void	parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) Delegates the call to the matching component parser.
void	setFallback(Parser fallback) Sets the fallback parser.
void	setMediaTypeRegistry(MediaTypeRegistry registry) Sets the media type registry used to infer type relationships.
void	setParsers(Map<MediaType,Parser> parsers) Sets the component parsers.

Methods inherited from class org.apache.tika.parser.AbstractParser

parse

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeParser

public CompositeParser(MediaTypeRegistry registry,
                       List<Parser> parsers,
                       Collection<Class<? extends Parser>> excludeParsers)

CompositeParser

public CompositeParser(MediaTypeRegistry registry,
                       List<Parser> parsers)

CompositeParser

public CompositeParser(MediaTypeRegistry registry,
                       Parser... parsers)

CompositeParser

public CompositeParser()

Method Detail

getParsers

public Map<MediaType,Parser> getParsers(ParseContext context)

findDuplicateParsers

public Map<MediaType,List<Parser>> findDuplicateParsers(ParseContext context)

Utility method that goes through all the component parsers and finds all media types for which more than one parser declares support. This is useful in tracking down conflicting parser definitions.

Parameters:

context - parsing context

Returns:

media types that are supported by at least two component parsers

Since:

Apache Tika 0.10

See Also:

TIKA-660

getMediaTypeRegistry

public MediaTypeRegistry getMediaTypeRegistry()

Returns the media type registry used to infer type relationships.

Returns:

media type registry

Since:

Apache Tika 0.8

setMediaTypeRegistry

public void setMediaTypeRegistry(MediaTypeRegistry registry)

Sets the media type registry used to infer type relationships.

Parameters:

registry - media type registry

Since:

Apache Tika 0.8

getAllComponentParsers

public List<Parser> getAllComponentParsers()

Returns all parsers registered with the Composite Parser, including ones which may not currently be active. This won't include the Fallback Parser, if defined

getParsers

public Map<MediaType,Parser> getParsers()

Returns the component parsers.

Returns:

component parsers, keyed by media type

setParsers

public void setParsers(Map<MediaType,Parser> parsers)

Sets the component parsers.

Parameters:

parsers - component parsers, keyed by media type

getFallback

public Parser getFallback()

Returns the fallback parser.

Returns:

fallback parser

setFallback

public void setFallback(Parser fallback)

Sets the fallback parser.

Parameters:

fallback - fallback parser

getParser

protected Parser getParser(Metadata metadata)

Returns the parser that best matches the given metadata. By default looks for a parser that matches the content type metadata property, and uses the fallback parser if a better match is not found. The type hierarchy information included in the configured media type registry is used when looking for a matching parser instance.

Subclasses can override this method to provide more accurate parser resolution.

Parameters:

metadata - document metadata

Returns:

matching parser

getParser

protected Parser getParser(Metadata metadata,
                           ParseContext context)

getSupportedTypes

public Set<MediaType> getSupportedTypes(ParseContext context)

Description copied from interface: Parser

Returns the set of media types supported by this parser when used with the given parse context.

Parameters:

context - parse context

Returns:

immutable set of media types

parse

public void parse(InputStream stream,
                  ContentHandler handler,
                  Metadata metadata,
                  ParseContext context)
           throws IOException,
                  SAXException,
                  TikaException

Delegates the call to the matching component parser.

Potential RuntimeExceptions, IOExceptions and SAXExceptions unrelated to the given input stream and content handler are automatically wrapped into TikaExceptions to better honor the Parser contract.

Parameters:

stream - the document stream (input)

handler - handler for the XHTML SAX events (output)

metadata - document metadata (input and output)

context - parse context

Throws:

IOException - if the document stream could not be read

SAXException - if the SAX events could not be processed

TikaException - if the document could not be parsed