Petr Slaby created PDFBOX-2132:
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Summary: Provide a pluggable exception handler to PDFStreamEngine
Key: PDFBOX-2132
URL: https://issues.apache.org/jira/browse/PDFBOX-2132
Project: PDFBox
Issue Type: Improvement
Components: Rendering
Affects Versions: 2.0.0
Reporter: Petr Slaby
Attachments: ExceptionHandler.patch
In our text processing and OMS application, PDFs are used as attachments to
documents and rendered to target formats, among others AFP or PCL. The
rendering part is implemented as a Graphics2D which gets called from PageDrawer
and produces corresponding commands in the target printing language.
As PDF is a much richer language than AFP or PCL, there are cases when we are
not able to directly implement the corresponding g2d function (e.g. partial
transparency of objects in AFP as it only supports transparency masks in
bitmaps). In such case, the g2d implementation throws an
UnsupportedOperationException which is supposed to abort the rendering in
PDFBox. We catch the exception back in our code and render the PDF as a full
page bitmap using a BufferedImage instead.
Current PDFBox trunk implementation swallows all exceptions that happen in
PDFStreamEngine. For our purposes, a pluggable exception handler that can log
all exceptions and re-throw UnsupportedOperationException would be perfect. A
simple solution that works for me is shown in the attached patch.
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