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https://issues.apache.org/jira/browse/PDFBOX-4496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803357#comment-16803357
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Tilman Hausherr commented on PDFBOX-4496:
-----------------------------------------
OK, I'm beginning to understand… this code
{code:java}
PDDocument doc = PDDocument.load(new
URL("https://issues.apache.org/jira/secure/attachment/12963758/original.pdf";).openStream());
doc.getDocumentCatalog().getOCProperties().setGroupEnabled("de", false);
doc.getDocumentCatalog().getOCProperties().setGroupEnabled("fi", true);
BufferedImage bim = new PDFRenderer(doc).renderImage(0, 4);
ImageIO.write(bim, "png", new File("huhu.png"));
{code}
Should render the PDF with the French/Italian text and without the
German/English text, but it doesn't, and your patch corrects this.
> OCG enablement with string parameter is not well defined
> --------------------------------------------------------
>
> Key: PDFBOX-4496
> URL: https://issues.apache.org/jira/browse/PDFBOX-4496
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.14
> Reporter: Stefan Ziel
> Priority: Major
> Labels: OCGs
> Attachments: PDFBOX-4496.patch, original.pdf
>
>
> The class {noformat}
> org.apache.pdfbox.pdmodel.graphics.optionalcontent.PDOptionalContentProperties
> {noformat}
> contains two methods
> {noformat} setGroupEnabled(String, boolean){noformat} and {noformat}
> isGroupEnabled(String){noformat}
> accessing the OCG's state using a name as parameter.
> As there can exist various OCG with the same name this access is not well
> defined.
> The current implementation accesses the first group with this name it can
> find.
> To make the setter work a solution would be a loop over all groups with the
> given name and add them to ON or OFF. Consider to rename it to
> {noformat}setGroupsEnabledByName{noformat}
> The getter should return some error state if the groups diverge in state - or
> better drop it ...
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