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https://issues.apache.org/jira/browse/PDFBOX-4723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192411#comment-17192411
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Andreas Lehmkühler commented on PDFBOX-4723:
--------------------------------------------

After resolving PDFBOX-4954 there are only those cases left where COSArrayList 
is used as converter/bridge from COS- to PD-level objects. We should think 
about the real purpose of COSArrayList. Do we really need to sync the COS and 
the PD-level objects? Maybe it is ok to limit that class to convert those 
objects from one level to the other?

> 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: 3.0.0 PDFBox
>
>         Attachments: bird_burst.heic.pdf, image-2020-09-02-13-52-21-370.png, 
> image-2020-09-02-13-53-02-622.png, image-2020-09-02-13-54-31-630.png, 
> screenshot-1.png
>
>
> 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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