/*
 * @(#)BBoardServlet.java	1.16 97/05/22
 * 
 * Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 * 
 * CopyrightVersion 1.0
 */

import java.io.*;
import java.net.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

/*
 * Bulletin board servlet
 * @author  Rachel Gollub
 */
public class BBoardServlet extends HttpServlet {

    /*
     * This gets the information from the html form, reads the file,
     * and writes to it.
     */
    public void service(HttpServletRequest req, HttpServletResponse res)
	throws IOException
    {
	ServletOutputStream out = res.getOutputStream();
	ServletContext servletContext = getServletContext();
	String bBoardName = servletContext.getRealPath("board.html");
	RandomAccessFile fil = new RandomAccessFile(bBoardName, "rw");
	String entry = req.getParameter("entry");
	String noentry = req.getParameter("noentry");
	String entries[] = new String[50];
	int i;
	entries[0] = null;

        res.setContentType("text/html");

	for (i=1; i<50; i++)
	    if (fil.getFilePointer() < fil.length())
		entries[i] = fil.readLine();
	    else
		entries[i] = null;

	/* This bit, including the horrid concat line, writes to the file,
	 * replacing all \n characters with <BR>.
	 */

	if (entry != null && noentry == null) {
	    fil.seek(0);
	    while ((i=entry.indexOf("\n")) != -1)
		entry=entry.substring(0,i-1).concat("<BR>").concat(entry.substring(i+1,entry.length()));
	    entries[0]=entry;
	    fil.writeBytes(entry + "\n");
	    for (i=1; i<50; i++)
		if (entries[i] != null)
		    fil.writeBytes(entries[i] + "\n");
	}
	fil.close();
	BuildBoard(out, entries);
    }

    /*
     * This parses the information into bulletin board entries.
     */
    public void BuildBoard(ServletOutputStream out, String entries[]) throws IOException {
	int i;

	out.print("<HR>");
	for (i=0; i<50; i++)
	    if (entries[i] != null) {
		out.print(entries[i]);
		out.print("<HR>");
	    }
        out.flush();
    }

    public String getServletInfo() {
        return "This servlet maintains a bulletin board on a server.";
    }

}