RE: [iText-questions] RV: Improvements to iText

Paulo Soares Wed, 25 Feb 2004 04:20:05 -0800

Title: RE: [iText-questions] RV: Improvements to iText

Send me the changes and examples.

Best Regards,
Paulo Soares

-----Original Message-----
From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED] On Behalf Of Carmona Perez, David

Sent:   Wednesday, February 25, 2004 11:47
To:     Itext-Questions (E-mail)
Subject:        [iText-questions] RV: Improvements to iText

What steps should I do in order to incorportate the improvements I have made to iText?

I think are quite generic and they may be useful to other people using iText.

I have them documented, and explained.

--------
David

-----Mensaje original-----
De: Carmona Perez, David
Enviado el: viernes, 20 de febrero de 2004 9:08
Para: Itext-Questions (E-mail)
Asunto: RV: [iText-questions] RV: PdfWriter.fitsPage()

The speed improvements I have gotten by preventing rendering more than once a table with fitsPage(), are spectacular. It takes less than half the time.

--------
David

-----Mensaje original-----
De: Carmona Perez, David
Enviado el: jueves, 19 de febrero de 2004 16:14
Para: Itext-Questions (E-mail)
Asunto: [iText-questions] RV: PdfWriter.fitsPage()

I repost the message, because of the lose of formatting, prevents good readability.

--------
David

-----Mensaje original-----
De: Carmona Perez, David
Enviado el: jueves, 19 de febrero de 2004 15:58
Para: Itext-Questions (E-mail)
Asunto: PdfWriter.fitsPage()

Hi Paulo, Bruno,

I have the following needs:

1- Build tables with arbitrary rowspans and colspans
2- Tables can be very big in size, so memory consumption is important
3- Must be quick

Discarded solutions
1- Use PdfPTable by need 1
2- Build a big table in memory and the render it, by need 2
3- Use PdfWriter.fitsPage(Table) because is very slow. If we call it for every row, a PdfTable is created each time.

Proposed solution:
Use the Table class, and use a changed version of iText.

Changes:
I have changed the iText library version 1.02b (latest one), without breaking compatibility with previous APIs, that would like to share with the iText community and integrate with current code.

The changes consist mainly of the following new methods in class PdfWriter:

        public PdfTable getPdfTable(Table table) {
                return pdf.getPdfTable(table, true);
        }

        public boolean breakTableIfDoesnFit(PdfTable table) throws DocumentException {
                return pdf.breakTableIfDoesnFit(table);
        }

All methods of PdfTable remain private, so the user code doesn't have to interact with this class, the Table interface is used instead. It could even be replaced with a marker interface, if we don't want to expose this implementation class.

Typical use scenario of this new functions:

PdfWriter writer;
....
Table table = new Table();
PdfTable pdfTable = writer.getPdfTable();
...
for (int i = 0; i < bigNumberOfRows; i++) {
        Cell column1, column2, column3;
        ...
        table.addCell(column1);
        table.addCell(column2);
        table.addCell(column3);
        /* This method which is very quick, renders a page of a PdfTable
             if it doesn't fit the current page, and empties both table and pdfTable in that case. Its use is optional*/

writer.breakTableIfDoesntFit(pdfTable);
}
// Write remaining rows. document.add() accepts either a Table or a PdfTable
document.add(pdfTable);

What do you think?

--------
David

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