/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2006-2018 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright 
     notice, this list of conditions and the following disclaimer in 
     the documentation and/or other materials provided with the distribution.

  3. The names of the authors may not be used to endorse or promote products
     derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.jcraft.jsch;

import java.io.PrintWriter;
import java.io.StringWriter;

public interface Logger{

  public final int DEBUG=0;
  public final int INFO=1;
  public final int WARN=2;
  public final int ERROR=3;
  public final int FATAL=4;

  public boolean isEnabled(int level);

  public void log(int level, String message);
  
  public default void log(int level, String message, Throwable cause) {
    if (!isEnabled(level)) {
      return;
    }
    if (cause != null) {
      StringWriter sw = new StringWriter();
      try (PrintWriter pw = new PrintWriter(sw, true)) {
        cause.printStackTrace(pw);
      }
      message += System.lineSeparator() + sw.toString();
    }
    log(level, message);
  }

  /*
  public final Logger SIMPLE_LOGGER=new Logger(){
      public boolean isEnabled(int level){return true;}
      public void log(int level, String message){System.err.println(message);}
    };
  final Logger DEVNULL=new Logger(){
      public boolean isEnabled(int level){return false;}
      public void log(int level, String message){}
    };
  */
}
