package com.psibt.framework.net;

import java.io.*;
import java.net.*;
import java.util.*;
import org.apache.log4j.*;

/**
 * This class implements a RequestHandler for log4j configuration. It serves the "/log4j/" path
 * in the PluggableHTTPServer. If this path is requested a list of all current log4j categories
 * with their current priorities is created. All priority settings can be changed by the user
 * and can be submitted and taken over.
 *
 * @author Volker Mentzner
 */
public class Log4jRequestHandler extends RootRequestHandler {

  private Priority[] prios = Priority.getAllPossiblePriorities();

 /**
   * Creates a new Log4jRequestHandler object
   */
  public Log4jRequestHandler() {
    this.setTitle("log4j");
    this.setDescription("log4j configuration");
    this.setHandledPath("/log4j/");
  }

 /**
   * Handles the given request and writes the reply to the given out-stream.
   *
   * @param request - client browser request
   * @param out - Out stream for sending data to client browser
   * @return if the request was handled by this handler : true, else : false
   */
  public boolean handleRequest(String request, Writer out) {
    String path = "";
    String query = null;
    String name;
    try {
      // check request url
      URL url = new URL("http://localhost"+request);
      path = url.getPath();
      query = url.getQuery();
      if (path.startsWith(this.getHandledPath()) == false) {
        return false;
      }

      out.write("HTTP/1.0 200 OK\r\n");
      out.write("Content-type: text/html\r\n\r\n");
      out.write("\r\n");
      out.write("
log4j
\r\n");
      out.write(this.getDescription() + "

\r\n");

      // handle a request with query
      if ((query != null) && (query.length() >= 0)) {
        StringTokenizer st = new StringTokenizer(query, "&");
        String cmd;
        String catname;
        String catval;
        int idx;
        while (st.hasMoreTokens()) {
          cmd = st.nextToken();
          idx = cmd.indexOf("=");
          catname = cmd.substring(0, idx);
          catval = cmd.substring(idx+1, cmd.length());
          if (catname.equalsIgnoreCase("root"))
            Category.getRoot().setPriority(Priority.toPriority(catval));
          else
            Category.getInstance(catname).setPriority(Priority.toPriority(catval));
        }
      }

      // output category information in a form with a simple table
      out.write("
");
      out.write("\r\n");
      out.write(" \r\n");
      out.write("  \r\n");
      out.write("  \r\n");
      out.write("  \r\n");
      out.write(" \r\n");

      // output for root category
      Category cat = Category.getRoot();
      out.write(" \r\n");
      out.write("  \r\n");
      out.write("  \r\n");
      out.write(" \r\n");

      // output for all other categories
      for (Enumeration en = Category.getCurrentCategories(); en.hasMoreElements();) {
        cat = (Category)en.nextElement();
        out.write(" \r\n");
        out.write("  \r\n");
        out.write("  \r\n");
        out.write("  \r\n");
        out.write(" \r\n");
      }
      out.write("
Category
Priority
Appender
root
\r\n");
      out.write("   ");
      for (int i = 0; i < prios.length; i++) {
        if (cat.getChainedPriority().toString().equals(prios[i].toString()))
          out.write(""+prios[i].toString());
        else
          out.write(""+prios[i].toString());
      }
      out.write("\r\n");
      out.write("  
\r\n");
      for (Enumeration apds = cat.getAllAppenders(); apds.hasMoreElements();) {
        Appender apd = (Appender)apds.nextElement();
        name = apd.getName();
        if (name == null)
          name = "(no name)";
        out.write(name);
        if (apd instanceof AppenderSkeleton) {
          try {
            AppenderSkeleton apskel = (AppenderSkeleton)apd;
            out.write(" [" + apskel.getThreshold().toString() + "]");
          } catch (Exception ex) {
          }
        }
        if (apds.hasMoreElements())
          out.write(",  ");
      }
      out.write("  
" + cat.getName() + "
\r\n");
        out.write("   ");
        for (int i = 0; i < prios.length; i++) {
          if (cat.getChainedPriority().toString().equals(prios[i].toString()))
            out.write(""+prios[i].toString());
          else
            out.write(""+prios[i].toString());
        }
        out.write("\r\n");
        out.write("  
\r\n");
        for (Enumeration apds = cat.getAllAppenders(); apds.hasMoreElements();) {
          Appender apd = (Appender)apds.nextElement();
          name = apd.getName();
          if (name == null)
            name = "(no name)";
          out.write(name);
          if (apd instanceof AppenderSkeleton) {
            try {
              AppenderSkeleton apskel = (AppenderSkeleton)apd;
              out.write(" [" + apskel.getThreshold().toString() + "]");
            } catch (Exception ex) {
            }
          }
          if (apds.hasMoreElements())
            out.write(",  ");
        }
        out.write("  
\r\n");
      out.write("");
      out.write("
");
      out.write("\r\n");
      out.flush();
      return true;
    } catch (Exception ex) {
      return false;
    }
  }
}