Am 24.02.2016 um 23:38 schrieb David Lattimore:
On Wed, Feb 24, 2016 at 6:39 PM, Tilman Hausherr<[email protected]>
wrote:
>Am 24.02.2016 um 06:21 schrieb David Lattimore:
>
>>I'm trying to read annotations from PDFs and am having trouble matching up
>>replies with the annotations they're in reply to.
>>
>>PDPage.getAnnotations() returns a list of PDAnnotation. When I have
>>a PDAnnotationMarkup, I try to call getInReplyTo to get the previous
>>annotation in the thread. But I have two problems:
>>
>>1) getInReplyTo() crashes if the annotation isn't a reply. It'd be nice if
>>it just returned null. I can work around this by getting the COSDictionary
>>and checking for an IRT entry first.
>>
>
>Please post a stack trace
java.io.IOException: Error: Unknown annotation type null
at
org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation.createAnnotation(PDAnnotation.java:167)
at
org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationMarkup.getInReplyTo(PDAnnotationMarkup.java:225)
The following code can be used to reproduce this:
new PDAnnotationMarkup().getInReplyTo();
So it is an IOException, this isn't as bad as a nullpointerexception.
But it is kindof weird indeed, usually we just return null when
something doesn't exist. (I know that this is bad design
http://www.yegor256.com/2014/05/13/why-null-is-bad.html but it's too
late now). I'll sleep over it and then probably change it.
Tilman
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