package at.gv.egovernment.moa.ss.erechtclient;

import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Writer;

import javax.servlet.ServletOutputStream;

/**
 * Base class of MOA specific exceptions.
 * 
 * This class has the ability to wrap other exceptions which may be seen
 * as the root cause for this exception. 
 * 
 * @author Gregor Karlinger
 * @version $Id$
 */
public class ERechtClientException extends Exception {

  /** The wrapped <code>Throwable</code>. */
  private Throwable wrapped_;

  /**
   * Create a <code>MOAException</code>.
   * 
   * @param message The message contained in the created <code>ERechtClientException</code>.
   */
  public ERechtClientException(String message) 
  {
    super(message);
  }

  /**
   * Create a <code>MOAException</code>.
   * 
   * @param message The message contained in the created <code>ERechtClientException</code>.
   * 
   * @param wrapped The exception wrapped by the created <code>ERechtClientException</code>.
   */
  public ERechtClientException(String message, Throwable wrapped) 
  {
    super(message, wrapped);
    this.wrapped_ = wrapped;
  }
  
  /**
   * Print a stack trace of this exception to <code>System.err</code>.
   * 
   * @see java.lang.Throwable#printStackTrace()
   */
  public void printStackTrace() 
  {
    printStackTrace(System.err);
  }

  /**
   * Print a stack trace of this exception, including the wrapped exception.
   * 
   * @param s The stream to write the stack trace to.
   * 
   * @see java.lang.Throwable#printStackTrace(java.io.PrintStream)
   */
  public void printStackTrace(PrintStream s) 
  {
    super.printStackTrace(s);
    if (wrapped_ != null) 
    {
      s.print("Caused by: ");
      wrapped_.printStackTrace(s);
    }
  }

  /**
   * Print a stack trace of this exception, including the wrapped exception.
   * 
   * @param s The stream to write the stacktrace to.
   * 
   * @see java.lang.Throwable#printStackTrace(java.io.PrintWriter)
   */
  public void printStackTrace(PrintWriter s) {
    super.printStackTrace(s);
    if (wrapped_ != null) 
    {
      s.print("Caused by: ");
      wrapped_.printStackTrace(s);
    }
  }

  /**
   * Print a stack trace of this exception, including the wrapped exception.
   * 
   * @param s The stream to write the stacktrace to.
   * 
   * @see java.lang.Throwable#printStackTrace(java.io.PrintWriter)
   */
  public String getStackTracePrint() 
  {
    ByteArrayOutputStream bAOS = new ByteArrayOutputStream();
    PrintWriter s = new PrintWriter(bAOS);
    super.printStackTrace(s);
    if (wrapped_ != null) 
    {
      s.print("Caused by: ");
      wrapped_.printStackTrace(s);
    }
    s.flush();
    return bAOS.toString();
  }
}