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https://issues.apache.org/jira/browse/PDFBOX-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991408#comment-12991408
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Mel Martinez commented on PDFBOX-956:
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Kevin,
I like the look of this optimization, though I haven't run it yet.
One comment: The 52b22bd6.pdf file that you attached as a test case seems a
bit problematic. It apparently makes use of javascript. For security reasons
I normally run with javascript disabled on PDFs. When I try to open this file
with Adobe Reader from Firefox, it properly prompted me with whether to allow
the javascript to run and before I could answer it hung up the Adobe Reader for
about 90 seconds and then blew away both the Reader (v9.4.0) AND Firefox
(v3.6.13). This is on a 64bit Win XP Pro machine (latest patches as of a
couple of days ago).
After restarting everything I tried once more (thinking maybe Firefox had
gotten to a cluttered state) but it did it again right off the bat.
I'm not sure what happened at a micro level to cause that but I wonder if the
file has some sort of corruption?
> Poor text extraction performance in PDFTextStripper.java
> --------------------------------------------------------
>
> Key: PDFBOX-956
> URL: https://issues.apache.org/jira/browse/PDFBOX-956
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.4.0
> Reporter: Kevin Jackson
> Fix For: 1.5.0
>
> Attachments: 52b22bd6_69.pdf, PDFTextStripper.java.patch
>
>
> The worst case performance of the suppressDuplicateOverlappingText logic in
> processTextPosition is O(n^2).
> The patch is to use a TreeMap to achieve O(N log N) performance.
> The example PDF took over 2 hours to extract the text before this patch and
> less than 10 minute after.
> BTW: The extracted text is also quite different compared to Adobe Reader.
> Not sure which is correct but for this document it doesn't matter.
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