The following issue has been updated:
Updater: fabrizio giustina (mailto:[EMAIL PROTECTED])
Date: Fri, 1 Oct 2004 6:58 AM
Changes:
Component changed to Export
Component changed from Tag Library
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For a full history of the issue, see:
http://jira.codehaus.org/browse/DISPL-13?page=history
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View the issue:
http://jira.codehaus.org/browse/DISPL-13
Here is an overview of the issue:
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Key: DISPL-13
Summary: PDF Export
Type: Improvement
Status: In Progress
Priority: Major
Original Estimate: Unknown
Time Spent: 1 day
Remaining: Unknown
Project: DisplayTag
Components:
Export
Fix Fors:
1.0 RC2
Versions:
1.0 RC2
Assignee: fabrizio giustina
Reporter: fabrizio giustina
Created: Thu, 23 Sep 2004 5:31 PM
Updated: Fri, 1 Oct 2004 6:58 AM
Description:
====
imported from sf tracker
id 1026408
submitted by Ivan Markov - ivan_markov
http://sourceforge.net/tracker/index.php?func=detail&group_id=73068&atid=536613&aid=1026408
====
PDF Export
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Our main goal while developing this patch was to do as little changes as possible in
the existing display tag code.
You know - the smaller the patch, the easier to be accepted. :)
We had to change a little the code of BaseExportView, ExportViewFactory &
MediaTypeEnum.
The changes in these classes revolve around our idea to make the export stuff in
display tag *extensible*.
The current set of exported formats supported by DT (CSV, Tab-delimited Excel, HTML,
XML) all do their stuff relying on core J2SE features only.
PDF, however, is complex enough so as we needed to drag a dependency on IText
(http://www.lowagie.com/iText/). Since we didn't want to make display tag itself
dependent on IText, we instead provided means for the user to register in DT a new
exporter.
With our patch, user needing custom export has to:
a.1) Write the exporter, by extending BaseExportView. That's what we did for PDF: our
PDFView extends BaseExportView.
a.2) The exporter should have a constructor with the same parameters as the one in
BaseExportView, because our patch uses reflection to instantiate the appropriate
exporter.
b) Somewhere in the webapp, probably in the init() method of the main servlet, the
user needs to issue:
MediaTypeEnum.registerView("<new-exporter-name>", <new-exporter-class>);
For our PDF export, we'll do:
MediaTypeEnum.registerView("pdf", PdfView.class);
We'll consider providing means for specifying this in the table.properties file too.
Note that only the changes to BaseExportView/ExportViewFactory/MediaTypeEnum are
important.
Our PDFView does not and SHOULD NOT rely on any other DT API.
I would imagine, you guys wouldn't like dependency on IText, so PDFView can find its
way in an optional package.
In future, I suppose XLS export may emerge, based on JExcelAPI (jexcelapi.sf.net),
which provides richer formatting means than the regular CSV/Tab-delimited Excel export.
Compiling The Code
------------------
You can try to apply the attached paging_and_pdf.diff file (diff to latest CVS as of
Sep 11 2004). Note that it will introduce dependency on IText, because of PDFView,
which is included for demoing.
You can also just unzip the attached archive which contains the latest CVS DT patched.
Also, Eclipse project files are provided within.
!NOTE: You need to move all 3rd party jar dependencies in WEB-INF/lib (for demoing)
INCLUDING itext-1.02b-custom.jar (from http://www.lowagie.com/iText/download.html)
so that you can just point the servlet engine to ... /displaytag2/src/webapp .
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