org.apache.jackrabbit.extractor
Class CompositeTextExtractor

java.lang.Object
  org.apache.jackrabbit.extractor.CompositeTextExtractor

All Implemented Interfaces:

TextExtractor

Direct Known Subclasses:

DefaultTextExtractor

public class CompositeTextExtractor
extends Object
implements TextExtractor

Composite text extractor. This class presents a unified interface for a set of TextExtractor instances. The composite extractor supports all the content types supported by the component extractors, and delegates text extraction calls to the appropriate components.

Constructor Summary

CompositeTextExtractor()

Method Summary

void	addTextExtractor(TextExtractor extractor) Adds a component text extractor.
Reader	extractText(InputStream stream, String type, String encoding) Extracts text content using one of the component extractors.
String[]	getContentTypes() Returns all the content types supported by the component extractors.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeTextExtractor

public CompositeTextExtractor()

Method Detail

addTextExtractor

public void addTextExtractor(TextExtractor extractor)

Adds a component text extractor. The given extractor is registered to process all the content types it claims to support.

Parameters:

extractor - component extractor

getContentTypes

public String[] getContentTypes()

Returns all the content types supported by the component extractors.

Specified by:

getContentTypes in interface TextExtractor

Returns:

supported content types

extractText

public Reader extractText(InputStream stream,
                          String type,
                          String encoding)
                   throws IOException

Extracts text content using one of the component extractors. If an extractor for the given content type does not exist, then the binary stream is just closed and an empty reader is returned.

Specified by:

extractText in interface TextExtractor

Parameters:

stream - binary stream

type - content type

encoding - optional character encoding

Returns:

reader for the text content of the binary stream

Throws:

IOException - if the binary stream can not be read