Package org.apache.tika.parser
Class DelegatingParser
- java.lang.Object
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- org.apache.tika.parser.AbstractParser
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- org.apache.tika.parser.DelegatingParser
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- All Implemented Interfaces:
Serializable
,Parser
- Direct Known Subclasses:
CryptoParser
,LanguageDetectingParser
public class DelegatingParser extends AbstractParser
Base class for parser implementations that want to delegate parts of the task of parsing an input document to another parser. The delegate parser is looked up from the parsing context using theParser
class as the key.- Since:
- Apache Tika 0.4, major changes in Tika 0.5
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description DelegatingParser()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Parser
getDelegateParser(ParseContext context)
Returns the parser instance to which parsing tasks should be delegated.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)
Looks up the delegate parser from the parsing context and delegates the parse operation to it.-
Methods inherited from class org.apache.tika.parser.AbstractParser
parse
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Method Detail
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getDelegateParser
protected Parser getDelegateParser(ParseContext context)
Returns the parser instance to which parsing tasks should be delegated. The default implementation looks up the delegate parser from the given parse context, and uses anEmptyParser
instance as a fallback. Subclasses can override this method to implement alternative delegation strategies.- Parameters:
context
- parse context- Returns:
- delegate parser
- Since:
- Apache Tika 0.7
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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
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parse
public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) throws SAXException, IOException, TikaException
Looks up the delegate parser from the parsing context and delegates the parse operation to it. If a delegate parser is not found, then an empty XHTML document is returned.Subclasses should override this method to parse the top level structure of the given document stream. Parsed sub-streams can be passed to this base class method to be parsed by the configured delegate 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:
SAXException
- if the SAX events could not be processedIOException
- if the document stream could not be readTikaException
- if the document could not be parsed
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