Package org.apache.tika.parser.multiple

Class AbstractMultipleParser

java.lang.Object

org.apache.tika.parser.multiple.AbstractMultipleParser

All Implemented Interfaces:

Serializable, Parser

Direct Known Subclasses:

FallbackParser, PickBestTextEncodingParser, SupplementingParser

public abstract class AbstractMultipleParser
extends Object
implements Parser

Abstract base class for parser wrappers which may / will process a given stream multiple times, merging the results of the various parsers used. End users should normally use FallbackParser or SupplementingParser along with a Strategy. Note that unless you give a ContentHandlerFactory, you'll get content from every parser tried mushed together!

Since:

Apache Tika 1.18

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	AbstractMultipleParser.MetadataPolicy	The various strategies for handling metadata emitted by multiple parsers.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final String	METADATA_POLICY_CONFIG_KEY

Constructor Summary

Constructors

Constructor	Description
AbstractMultipleParser(MediaTypeRegistry registry, Collection<? extends Parser> parsers, Map<String,Param> params)
AbstractMultipleParser(MediaTypeRegistry registry, AbstractMultipleParser.MetadataPolicy policy, Collection<? extends Parser> parsers)
AbstractMultipleParser(MediaTypeRegistry registry, AbstractMultipleParser.MetadataPolicy policy, Parser... parsers)

Method Summary

Modifier and Type	Method	Description
List<Parser>	getAllParsers()
MediaTypeRegistry	getMediaTypeRegistry()	Returns the media type registry used to infer type relationships.
AbstractMultipleParser.MetadataPolicy	getMetadataPolicy()
protected static AbstractMultipleParser.MetadataPolicy	getMetadataPolicy(Map<String,Param> params)
Set<MediaType>	getSupportedTypes(ParseContext context)	Returns the set of media types supported by this parser when used with the given parse context.
protected static Metadata	mergeMetadata(Metadata newMetadata, Metadata lastMetadata, AbstractMultipleParser.MetadataPolicy policy)
void	parse(InputStream stream, ContentHandlerFactory handlers, Metadata metadata, ParseContext context)	Deprecated. The ContentHandlerFactory override is still experimental and the method signature is subject to change before Tika 2.0
void	parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)	Processes the given Stream through one or more parsers, resetting things between parsers as requested by policy.
protected abstract boolean	parserCompleted(Parser parser, Metadata metadata, ContentHandler handler, ParseContext context, Exception exception)	Used to notify implementations that a Parser has Finished or Failed, and to allow them to decide to continue or abort further parsing
protected void	parserPrepare(Parser parser, Metadata metadata, ParseContext context)	Used to allow implementations to prepare or change things before parsing occurs
void	setMediaTypeRegistry(MediaTypeRegistry registry)	Sets the media type registry used to infer type relationships.

Methods inherited from class java.lang.Object

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

Field Details

METADATA_POLICY_CONFIG_KEY

protected static final String METADATA_POLICY_CONFIG_KEY

See Also:

• Constant Field Values

Constructor Details

AbstractMultipleParser

public AbstractMultipleParser(MediaTypeRegistry registry,
 Collection<? extends Parser> parsers,
 Map<String,Param> params)

AbstractMultipleParser

public AbstractMultipleParser(MediaTypeRegistry registry,
 AbstractMultipleParser.MetadataPolicy policy,
 Parser... parsers)

AbstractMultipleParser

public AbstractMultipleParser(MediaTypeRegistry registry,
 AbstractMultipleParser.MetadataPolicy policy,
 Collection<? extends Parser> parsers)

Method Details

getMetadataPolicy

protected static AbstractMultipleParser.MetadataPolicy getMetadataPolicy(Map<String,Param> params)

mergeMetadata

protected static Metadata mergeMetadata(Metadata newMetadata,
 Metadata lastMetadata,
 AbstractMultipleParser.MetadataPolicy policy)

getMediaTypeRegistry

public MediaTypeRegistry getMediaTypeRegistry()

Returns the media type registry used to infer type relationships.

Returns:

media type registry

setMediaTypeRegistry

public void setMediaTypeRegistry(MediaTypeRegistry registry)

Sets the media type registry used to infer type relationships.

Parameters:

registry - media type registry

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.

Specified by:

getSupportedTypes in interface Parser

Parameters:

context - parse context

Returns:

immutable set of media types

getMetadataPolicy

public AbstractMultipleParser.MetadataPolicy getMetadataPolicy()

getAllParsers

public List<Parser> getAllParsers()

parserPrepare

protected void parserPrepare(Parser parser,
 Metadata metadata,
 ParseContext context)

Used to allow implementations to prepare or change things before parsing occurs

parserCompleted

protected abstract boolean parserCompleted(Parser parser,
 Metadata metadata,
 ContentHandler handler,
 ParseContext context,
 Exception exception)

Used to notify implementations that a Parser has Finished or Failed, and to allow them to decide to continue or abort further parsing

parse

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

Processes the given Stream through one or more parsers, resetting things between parsers as requested by policy. The actual processing is delegated to one or more Parsers.

Note that you'll get text from every parser this way, to have control of which content is from which parser you need to call the method with a ContentHandlerFactory instead.

Specified by:

parse in interface Parser

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

parse

@Deprecated
public void parse(InputStream stream,
 ContentHandlerFactory handlers,
 Metadata metadata,
 ParseContext context)
           throws IOException,
SAXException,
TikaException

Deprecated.

The ContentHandlerFactory override is still experimental and the method signature is subject to change before Tika 2.0

Processes the given Stream through one or more parsers, resetting things between parsers as requested by policy. The actual processing is delegated to one or more Parsers. You will get one ContentHandler fetched for each Parser used. TODO Do we need to return all the ContentHandler instances we created?

Throws:

IOException

SAXException

TikaException