org.apache.jackrabbit.extractor
Class PngTextExtractor

java.lang.Object
  org.apache.jackrabbit.extractor.AbstractTextExtractor
      org.apache.jackrabbit.extractor.PngTextExtractor

All Implemented Interfaces:

TextExtractor

public class PngTextExtractor
extends AbstractTextExtractor

Text extractor for png/apng/mng images. This class extracts the text content from tEXt chunks.

can handle image with mime types (image/png, image/apng, image/mng)

Constructor Summary

PngTextExtractor()
Creates a new PngTextExtractor instance.

Method Summary

java.io.Reader

extractText(java.io.InputStream stream, java.lang.String type, java.lang.String encoding) Returns a reader for the text content of the given png image.

Methods inherited from class org.apache.jackrabbit.extractor.AbstractTextExtractor

getContentTypes

Methods inherited from class java.lang.Object

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

Constructor Detail

PngTextExtractor

public PngTextExtractor()

Creates a new PngTextExtractor instance.

Method Detail

extractText

public java.io.Reader extractText(java.io.InputStream stream,
                                  java.lang.String type,
                                  java.lang.String encoding)
                           throws java.io.IOException

Returns a reader for the text content of the given png image. Returns an empty reader if the png document could not be parsed.

Parameters:

stream - png image

type - ignored

encoding - ignored

Returns:

reader for the text content of the given png image, or an empty reader if the image could not be parsed

Throws:

java.io.IOException - if the png image stream can not be closed