/*
 * $Id$
 *
 * This code is part of the 'iText Tutorial'.
 * You can find the complete tutorial at the following address:
 * http://itextdocs.lowagie.com/tutorial/
 *
 * This code 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.
 *
 * itext-questions@lists.sourceforge.net
 */

package com.lowagie.examples.general.webapp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;

/**
 * Hello World example as a Servlet.
 */
public class OutSimplePdf extends HttpServlet {
	private static final long serialVersionUID = 2788260006560387781L;

	/**
	 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse)
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
		makePdf(request, response, "GET");
	}
	
	/**
	 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
			makePdf(request, response, "POST");
	}
	/**
	 * Performs the action: generate a PDF from a GET or POST.
	 * 
	 * @param request	the Servlets request object
	 * @param response	the Servlets request object
	 * @param methodGetPost	the method that was used in the form
	 */
	public void makePdf(HttpServletRequest request, HttpServletResponse response, String methodGetPost) {
		try {

			// take the message from the URL or create default message
			String msg = request.getParameter("msg");
			if (msg == null || msg.trim().length() <= 0)
				msg = "[ specify a message in the 'msg' argument on the URL ]";

			// create simple doc and write to a ByteArrayOutputStream
			Document document = new Document();
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			PdfWriter.getInstance(document, baos);
			document.open();
			document.add(new Paragraph(msg));
			document.add(Chunk.NEWLINE);
			document.add(new Paragraph("The method used to generate this PDF was: " + methodGetPost));
			document.close();

			// setting some response headers
			response.setHeader("Expires", "0");
			response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
			response.setHeader("Pragma", "public");
			// setting the content type
			response.setContentType("application/pdf");
			// the contentlength is needed for MSIE!!!
			response.setContentLength(baos.size());
			// write ByteArrayOutputStream to the ServletOutputStream
			ServletOutputStream out = response.getOutputStream();
			baos.writeTo(out);
			out.flush();

		} catch (Exception e2) {
			System.out.println("Error in " + getClass().getName() + "\n" + e2);
		}
	}

	/**
	 * @see javax.servlet.GenericServlet#destroy()
	 */
	public void destroy() {
	}
}