Large tables

31st May 2016
iText

Example that shows how you can add a table little by little in order to keep the memory footprint low.

IncompleteTable.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.tables;
 
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.UnitValue;
 
import java.io.File;
 
public class IncompleteTable {
    public static final String DEST = "./target/sandbox/tables/incomplete_table.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new IncompleteTable().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
        Document doc = new Document(pdfDoc);
 
        Table table = new Table(UnitValue.createPercentArray(5), true);
 
        for (int i = 0; i < 5; i++) {
            table.addHeaderCell(new Cell().setKeepTogether(true).add(new Paragraph("Header " + i)));
        }
 
        doc.add(table);
        for (int i = 0; i < 500; i++) {
            if (i % 5 == 0) {
                table.flush();
            }
            table.addCell(new Cell().setKeepTogether(true).add(new Paragraph("Test " + i).setMargins(0, 0, 0, 0)));
        }
 
        table.complete();
 
        doc.close();
    }
}
IncompleteTable.cs
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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2019 iText Group NV
Authors: iText Software.
 
For more information, please contact iText Software at this address:
sales@itextpdf.com
*/
 
using System;
using System.IO;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
 
namespace iText.Samples.Sandbox.Tables
{
    public class IncompleteTable
    {
        public static readonly string DEST = "../../results/sandbox/tables/incomplete_table.pdf";
 
        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();
 
            new IncompleteTable().ManipulatePdf(DEST);
        }
 
        private void ManipulatePdf(string dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(pdfDoc);
 
            // The second argument determines 'large table' functionality is used
            // It defines whether parts of the table will be written before all data is added.
            Table table = new Table(UnitValue.CreatePercentArray(5), true);
 
            for (int i = 0; i < 5; i++)
            {
                table.AddHeaderCell(new Cell().SetKeepTogether(true).Add(new Paragraph("Header " + i)));
            }
 
            // For the "large tables" they shall be added to the document before its child elements are populated
            doc.Add(table);
 
            for (int i = 0; i < 500; i++)
            {
                if (i % 5 == 0)
                {
                    // Moves to the new row of table
                    // Flush() and Complete() methods are required and used only for the 'large tables'
                    table.Flush();
                }
 
                table.AddCell(new Cell().SetKeepTogether(true).Add(new Paragraph("Test " + i)
                    .SetMargins(0, 0, 0, 0)));
            }
 
            // Indicates that no more content will be added to the table
            table.Complete();
 
            doc.Close();
        }
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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