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https://issues.apache.org/jira/browse/PDFBOX-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146818#comment-13146818
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Andreas Lehmkühler commented on PDFBOX-956:
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I improved the text extraction performance in revision 1199634. My changes are
based on Kevins patch, I simply replaced the NavigableMap/Set with a
TreeMap/Set. The results seem to be similar, the performance is way faster than
before.
Thanks for the contribution!
> Poor text extraction performance in PDFTextStripper.java
> --------------------------------------------------------
>
> Key: PDFBOX-956
> URL: https://issues.apache.org/jira/browse/PDFBOX-956
> Project: PDFBox
> Issue Type: Improvement
> Components: Text extraction
> Affects Versions: 1.4.0
> Reporter: Kevin Jackson
> Assignee: Andreas Lehmkühler
> Attachments: PDFBOX956-c4ce2fcd_69.txt, PDFTextStripper.java.patch,
> PDFTextStripper.pdf, c4ce2fcd_69.pdf
>
>
> 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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