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https://issues.apache.org/jira/browse/PDFBOX-4723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027531#comment-17027531
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Christian Appl commented on PDFBOX-4723:
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Testing the current Snapshot we encountered a problem with this solution. In
one of our tests we are checking the correct page order of a document, when
adding pages to a document. The test ended up adding the pages after the second
page instead of the fifth. (as the contents of page 2 and 5 of said document
seem to be identical)
One can easily reproduce this by inserting pages via
PDPageTree.insertBefore(...) / PDPageTree.insertAfter(...)
(which is using equals: _if (pageDict.equals(nextPage.getCOSObject()))_)
In my opinion content equality is not a sufficient criterium to deduce identity.
The thought of having a ready to use method to check content equality is nice
and I can understand the benefit of implementing it, but is it really necessary
to override "equals" to reach that goal? I would prefer if the equals method
would remain untouched and a new "contentEquals" (or the like) method was
created instead.
> Add equals() and hashCode() to PDAnnotation and COS objects
> -----------------------------------------------------------
>
> Key: PDFBOX-4723
> URL: https://issues.apache.org/jira/browse/PDFBOX-4723
> Project: PDFBox
> Issue Type: Sub-task
> Components: PDModel
> Affects Versions: 2.0.18
> Reporter: Maruan Sahyoun
> Assignee: Maruan Sahyoun
> Priority: Major
> Fix For: 2.0.19, 3.0.0 PDFBox
>
>
> In order to proper support removeAll/retainAll for COSArrayList we need to
> detect if entries are in fact duplicates of others. This currently fails as
> even though one might add the same instance of an annotation object multiple
> times to setAnnotations getting the annotations will have individual
> instances. See the discussion at PDFBOX-4669.
> In order to proper support removal we need to be able to detect equality
> where an object is equal if the underlying COSDictionary has the same entries.
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