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https://issues.apache.org/jira/browse/FOP-2148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536865#comment-13536865
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ffimbel commented on FOP-2148:
------------------------------
Looking at the source code, I could trace a possible cause for this bug.
In o.a.f..layoutmgr.PageProvider, in the method getPage
a test is done to verify if the page is the last one
boolean isLastPage = (lastPageIndex >= 0) && (index == lastPageIndex);
In the case of the fo attached (onlypage.fo) this test returns false as
lastPageIndex is still initialized to -1.
Further down the processing, in
o.a.f.fo.pagination.ConditionalPageMasterReference isValid method
the test (pagePosition == EN_ONLY && (isFirstPage && isLastPage)) fails
I do not have enough experience with the fop source code to provide a possible
patch, but hopefully this could help someone to do it for me.
> page-position="only" in conditional-page-master-reference does not work
> -----------------------------------------------------------------------
>
> Key: FOP-2148
> URL: https://issues.apache.org/jira/browse/FOP-2148
> Project: Fop
> Issue Type: Bug
> Components: page-master/layout
> Affects Versions: trunk
> Environment: Operating System:
> Platform: PC
> Reporter: ffimbel
> Attachments: lastpage.fo, lastpage.fo.pdf, onlypage.fo,
> onlypage.fo.pdf
>
>
> Using the attribute page-position="only" in a
> conditional-page-master-reference in order to produce a different page header
> if the document has only one page does not work.
> I get the header for multiple page even if I only have one page in the final
> output document.
> <fo:page-sequence-master master-name="Section_1">
> <fo:repeatable-page-master-alternatives>
> <fo:conditional-page-master-reference master-reference="Single"
> page-position="only" />
> <fo:conditional-page-master-reference master-reference="Multiple" />
> </fo:repeatable-page-master-alternatives>
> </fo:page-sequence-master>
> If I change the attribute to last, it works fine.
> <fo:page-sequence-master master-name="Section_1">
> <fo:repeatable-page-master-alternatives>
> <fo:conditional-page-master-reference master-reference="Single"
> page-position="last" />
> <fo:conditional-page-master-reference master-reference="Multiple" />
> </fo:repeatable-page-master-alternatives>
> </fo:page-sequence-master>
> I attached fo and pdf to reproduce the issue.
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