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iText, a free Java-PDF library
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/*
 * $Id: Divide.java 3271 2008-04-18 20:39:42Z xlv $
 * Copyright (c) 2005-2007 Carsten Hammer
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * This class was originally published under the MPL by Carsten Hammer.
 * It was a part of iText, a Java-PDF library. You can now use it under
 * the MIT License; for backward compatibility you can also use it under
 * the MPL version 1.1: http://www.mozilla.org/MPL/
 * A copy of the MPL license is bundled with the source code FYI.
 */

package com.lowagie.toolbox.plugins;

import java.io.File;
import java.io.FileOutputStream;

import javax.swing.JInternalFrame;

import com.lowagie.text.Document;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.toolbox.AbstractTool;
import com.lowagie.toolbox.arguments.AbstractArgument;
import com.lowagie.toolbox.arguments.FileArgument;
import com.lowagie.toolbox.arguments.filters.PdfFilter;

/**
 * This tool lets you generate a PDF that shows N pages on 1.
 * @since 2.1.1 (imported from itexttoolbox project)
 */
public class Divide extends AbstractTool {

	static {
		addVersion("$Id: Divide.java 3271 2008-04-18 20:39:42Z xlv $");
	}

	/**
	 * Constructs an Divide object.
	 */
	public Divide() {
		menuoptions = MENU_EXECUTE | MENU_EXECUTE_SHOW;
		arguments.add(new FileArgument(this, "srcfile",
				"The file you want to divide", false, new PdfFilter()));
		arguments.add(new FileArgument(this, "destfile", "The resulting PDF",
				true, new PdfFilter()));
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#createFrame()
	 */
	protected void createFrame() {
		internalFrame = new JInternalFrame("Divide", true, false, true);
		internalFrame.setSize(300, 80);
		internalFrame.setJMenuBar(getMenubar());
		System.out.println("=== Divide OPENED ===");
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#execute()
	 */
	public void execute() {
		try {
			if (getValue("srcfile") == null) {
				throw new InstantiationException(
						"You need to choose a sourcefile");
			}
			File src = (File) getValue("srcfile");
			if (getValue("destfile") == null) {
				throw new InstantiationException(
						"You need to choose a destination file");
			}
			File dest = (File) getValue("destfile");

			// we create a reader for a certain document
			PdfReader reader = new PdfReader(src.getAbsolutePath());
			// we retrieve the total number of pages and the page size
			int total = reader.getNumberOfPages();
			System.out.println("There are " + total
					+ " pages in the original file.");

			Rectangle pageSize = reader.getPageSize(1);
			Rectangle newSize = new Rectangle(pageSize.getWidth() / 2, pageSize
					.getHeight());
			// step 1: creation of a document-object
			Document document = new Document(newSize, 0, 0, 0, 0);
			// step 2: we create a writer that listens to the document
			PdfWriter writer = PdfWriter.getInstance(document,
					new FileOutputStream(dest));
			// step 3: we open the document
			document.open();
			// step 4: adding the content
			PdfContentByte cb = writer.getDirectContent();
			PdfImportedPage page;
			float offsetX, offsetY;
			int p;
			for (int i = 0; i < total; i++) {
				p = i + 1;
				pageSize = reader.getPageSize(p);
				newSize = new Rectangle(pageSize.getWidth() / 2, pageSize.getHeight());

				document.newPage();
				offsetX = 0;
				offsetY = 0;
				page = writer.getImportedPage(reader, p);
				cb.addTemplate(page, 1, 0, 0, 1, offsetX, offsetY);
				document.newPage();
				offsetX = -newSize.getWidth();
				offsetY = 0;
				page = writer.getImportedPage(reader, p);
				cb.addTemplate(page, 1, 0, 0, 1, offsetX, offsetY);

			}
			// step 5: we close the document
			document.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument)
     * @param arg StringArgument
     */
    public void valueHasChanged(AbstractArgument arg) {
		if (internalFrame == null) {
			// if the internal frame is null, the tool was called from the
			// command line
			return;
		}
		// represent the changes of the argument in the internal frame
	}

    /**
     * Generates a divided version of an NUp version of an existing PDF file.
     *
     * @param args String[]
     */
    public static void main(String[] args) {
		Divide tool = new Divide();
		if (args.length < 2) {
			System.err.println(tool.getUsage());
		}
		tool.setMainArguments(args);
		tool.execute();
	}

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#getDestPathPDF()
     * @throws InstantiationException
     * @return File
     */
    protected File getDestPathPDF() throws InstantiationException {
		return (File) getValue("destfile");
	}
}