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From "Staffan Olsson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TIKA-504) Support XMP metadata keys for more of the common EXIF tags
Date Wed, 08 Sep 2010 20:04:32 GMT

    [ https://issues.apache.org/jira/browse/TIKA-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907391#action_12907391
] 

Staffan Olsson commented on TIKA-504:
-------------------------------------

A question on the implementation:
Should Tika really have a fallback to string on fields with expected non-string types. For
example
               Object length = directory.getObject(ExifDirectory.TAG_ORIENTATION);
               if(length instanceof Integer) {
                  metadata.set(Metadata.ORIENTATION, Integer.toString( ((Integer)length).intValue()
));
               } else {
                  metadata.set(Metadata.ORIENTATION, directory.getString(ExifDirectory.TAG_ORIENTATION));
               }
Isn't there a risk that this produces type errors for the application that uses Tika? I think
it would be better if the value is skipped when it can't be parsed to the expected type.

> Support XMP metadata keys for more of the common EXIF tags
> ----------------------------------------------------------
>
>                 Key: TIKA-504
>                 URL: https://issues.apache.org/jira/browse/TIKA-504
>             Project: Tika
>          Issue Type: Improvement
>          Components: parser
>    Affects Versions: 0.7
>            Reporter: Nick Burch
>            Assignee: Nick Burch
>            Priority: Minor
>             Fix For: 0.8
>
>
> Following the work on TIKA-442, we now have some XMP inspired image metadata keys and
type properties. This currently only covers 4 core exif tags
> There are a couple of other common tags that we should probably handle in the same way.
The plan would be to define more entries in the TIFF metadata area, using the same definitions
as in XMP, and update the Exif parser to additionally map onto these. (The raw exif tags would
continue to be output too, for compatibility)
> The tags I propose to support are:
> * exif:ExposureTime
> * exif:FNumber
> * exif:Flash
> * exif:FocalLength
> * exif:IsoSpeedRatings
> * exif:Manufacturer
> * exif:Model
> * exif:Software
> * exif:Orientation
> * exif:XResolution
> * exif:YResolution
> * exif:ResolutionUnit
> Plus one extra date, which we don't really seem to have a suitable existing key for,
but maybe should be made more generic?
> * exif:DateTimeOriginal

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