Refactor image and jpeg parsers for access to MetadataExtractor API
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Key: TIKA-482
URL: https://issues.apache.org/jira/browse/TIKA-482
Project: Tika
Issue Type: Improvement
Components: parser
Affects Versions: 0.7
Reporter: Staffan Olsson
When I added support for more image metadata in TIKA-472, i realized
the current design had some restrictions:
* I could not access the typed getters from Metadata Extractor, such
as getDate (to format iso date) and getStringArray (for keywords).
* The handler function was called one field at a time which prevents
logic where one field depends on the value of another (there is for
example record versions and fields that specify encoding)
See attached patch. It refactors TiffExtractor to MetadataExtractorExtractor.
The patch also includes the date fix, see
https://issues.apache.org/jira/browse/TIKA-451#action_12898794
We can later add more Extractors using other libraries, and map to parsers
based on format. For example we already use ImageIO in ImageParser so maybe
there should be an ImageIOExtractor. To support more image formats we could
investigate XMP, for example using
http://www.pkg.dk/projects/XMP-Utilities-for-Java-XMPUtil4J/.
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