org.apache.tika.parser

Class ParserDecorator

java.lang.Object

org.apache.tika.parser.AbstractParser

org.apache.tika.parser.ParserDecorator

All Implemented Interfaces:

Serializable, Parser

Direct Known Subclasses:

CTAKESParser, DigestingParser, ParserPostProcessor

public class ParserDecorator
extends AbstractParser

Decorator base class for the Parser interface.

This class simply delegates all parsing calls to an underlying decorated parser instance. Subclasses can provide extra decoration by overriding the parse method.

To decorate several different parsers at the same time, wrap them in a CompositeParser instance first.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ParserDecorator(Parser parser) Creates a decorator for the given parser.

Method Summary

Modifier and Type	Method and Description
String	getDecorationName()
Set<MediaType>	getSupportedTypes(ParseContext context) Delegates the method call to the decorated parser.
Parser	getWrappedParser() Gets the parser wrapped by this ParserDecorator
void	parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) Delegates the method call to the decorated parser.
static Parser	withFallbacks(Collection<? extends Parser> parsers, Set<MediaType> types) Deprecated. Do not use until the TODOs are resolved, see TIKA-1509
static Parser	withoutTypes(Parser parser, Set<MediaType> excludeTypes) Decorates the given parser so that it never claims to support parsing of the given media types, but will work for all others.
static Parser	withTypes(Parser parser, Set<MediaType> types) Decorates the given parser so that it always claims to support parsing of the given media types.

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

ParserDecorator

public ParserDecorator(Parser parser)

Creates a decorator for the given parser.

Parameters:

parser - the parser instance to be decorated

Method Detail

withTypes

public static final Parser withTypes(Parser parser,
                                     Set<MediaType> types)

Decorates the given parser so that it always claims to support parsing of the given media types.

Parameters:

parser - the parser to be decorated

types - supported media types

Returns:

the decorated parser

withoutTypes

public static final Parser withoutTypes(Parser parser,
                                        Set<MediaType> excludeTypes)

Decorates the given parser so that it never claims to support parsing of the given media types, but will work for all others.

Parameters:

parser - the parser to be decorated

excludeTypes - excluded/ignored media types

Returns:

the decorated parser

withFallbacks

public static final Parser withFallbacks(Collection<? extends Parser> parsers,
                                         Set<MediaType> types)

Deprecated. Do not use until the TODOs are resolved, see TIKA-1509

Decorates the given parsers into a virtual parser, where they'll be tried in preference order until one works without error. TODO Is this the right name? TODO Is this the right place to put this? Should it be in CompositeParser? Elsewhere? TODO Should we reset the Metadata if we try another parser? TODO Should we reset the ContentHandler if we try another parser? TODO Should we log/report failures anywhere?

getSupportedTypes

public Set<MediaType> getSupportedTypes(ParseContext context)

Delegates the method call to the decorated parser. Subclasses should override this method (and use super.getSupportedTypes() to invoke the decorated parser) to implement extra decoration.

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 method call to the decorated parser. Subclasses should override this method (and use super.parse() to invoke the decorated parser) to implement extra decoration.

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

getDecorationName

public String getDecorationName()

Returns:

A name/description of the decoration, or null if none available

getWrappedParser

public Parser getWrappedParser()

Gets the parser wrapped by this ParserDecorator

Returns:

the parser wrapped by this ParserDecorator