I am trying to create a pdf portfolio by embedding one or more pdf files into
a "portfolio" file.
When creating this portfolio file from scratch, with PdfWriter and a
Document, the collection is set as expected. However, if I try to set the
collection on an already existing pdf document, using PdfStamper, it does
not work.
Is this expected behavior? Is it possible to set a collection dictionary on
an existing document? Is there something I'm missing that prevents the
collection dictionary from actually being written out to the document?
Here's a code snippet of what I am doing. As an example, I am creating a
hidden collection and setting the initial document to the first embedded
file.
As a new file:
byte[] innerDocument = // byte content of document getting embedded.
ByteArrayOutputStream outDoc = new ByteArrayOutputStream();
Document doc = new Document(PageSize.LETTER);
PdfWriter writer = PdfWriter.getInstance(wrapper, outDoc);
doc.open();
PdfCollection coll = new PdfCollection(PdfCollection.HIDDEN);
coll.setInitialDocument("document1");
writer.setCollection(coll);
PdfFileSpecification fs = PdfFileSpecification.fileEmbedded(writer, null,
"file.pdf", innerDocument, false);
fs.addDescription("document1", false);
writer.addFileAttachment(fs);
doc.add(new Paragraph("Some text for cover page."));
doc.close();
writer.close();
This works as expected. However, if I want to use an existing document as
the portfolio file, it does not add the collection dictionary:
byte[] innerDocument = // byte content of document getting embedded.
byte[] outerDocument = // byte content of existing document to embed file
into.
ByteArrayOutputStream outDoc = new ByteArrayOutputStream();
PdfReader outerDoc = new PdfReader(outerDocument);
PdfStamper stamper = new PdfStamper(outerDoc, outDoc);
PdfWriter writer = stamper.getWriter();
PdfCollection coll = new PdfCollection(PdfCollection.HIDDEN);
coll.setInitialDocument("document1");
writer.setCollection(coll);
PdfFileSpecification fs = PdfFileSpecification.fileEmbedded(writer, null,
"file.pdf", innerDocument, false);
fs.addDescription("document1", false);
writer.addFileAttachment(fs);
stamper.close();
When the document created by the first method is opened in Acrobat Reader,
it immediately opens the embedded file. Also, when viewing the document in
a text viewer, the Collection Dictionary can be seen in the document.
However, the document created by the second method does not switch
immediately to the embedded document. When viewing the created file in a
text viewer, the Collection Dictionary cannot be found.
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