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This powerful reporting library aims to simplify producing reports using iText. The most demanding and coding intensive tasks when producing reports with iText are how to get from data to report elements, how to style those blocks and how to evaluate (debug) the resulting report layout. Exactly those three tasks are simplified by this library: xml configuration and/or annotations to transform existing Java data objects into report block, provide styling information (css like, syntax independent) seperate from code, a firebug like debug mode to help evaluate your report.

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package com.vectorprint.report.itext;

/*
 * #%L
 * VectorPrintReport
 * %%
 * Copyright (C) 2012 - 2014 VectorPrint
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * #L%
 */

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 *
 * subclass supporting writing to an outputstream in two phases.
 *
 * @author Eduard Drenth at VectorPrint.nl
 */
abstract class AbstractTwoPassStream extends OutputStream implements TwoPassOutputStream {

   private OutputStream out = null, orig = null;
   private int bufferSize;
   private File tempFile;

   public AbstractTwoPassStream(OutputStream out, int bufferSize) throws IOException {
      this.bufferSize = bufferSize;
      orig = out;
      tempFile = File.createTempFile(getClass().getSimpleName(), "pdf");
      tempFile.deleteOnExit();
      this.out = new BufferedOutputStream(new FileOutputStream(tempFile), bufferSize);
   }

   /**
    * closes the outputstream and calls {@link #secondPass(java.io.OutputStream) } with the original outputstream. Note
    * that the original outputstream may be null when a subclass did not call {@link #setOut(java.io.OutputStream) }
    *
    * @throws IOException
    */
   @Override
   public final void close() throws IOException {
      out.close();
      if (orig != null) {
         secondPass(new BufferedInputStream(new FileInputStream(tempFile), bufferSize), orig);
         tempFile.delete();
      }
   }

   /**
    * writes to the wrapped outputstream.
    *
    * @param b
    * @throws IOException
    */
   @Override
   public final void write(int b) throws IOException {
      out.write(b);
   }


}