package de.unisiegen.gtitool.core.exceptions.machine;


import java.util.ArrayList;

import de.unisiegen.gtitool.core.entities.Symbol;
import de.unisiegen.gtitool.core.entities.Transition;
import de.unisiegen.gtitool.core.exceptions.CoreException;
import de.unisiegen.gtitool.core.exceptions.TransitionsInvolvedException;
import de.unisiegen.gtitool.core.i18n.Messages;


/**
 * The {@link MachineEpsilonTransitionException} is used, if there is a
 * {@link Transition} without a {@link Symbol}.
 * 
 * @author Christian Fehler
 * @version $Id: MachineEpsilonTransitionException.java 90 2007-11-04 16:20:27Z
 *          fehler $
 */
public final class MachineEpsilonTransitionException extends MachineException
    implements TransitionsInvolvedException
{

  /**
   * The serial version uid.
   */
  private static final long serialVersionUID = -7273516723544742004L;


  /**
   * The {@link Transition}.
   */
  private Transition transition;


  /**
   * Allocates a new {@link MachineEpsilonTransitionException}.
   * 
   * @param transition The {@link Transition}.
   */
  public MachineEpsilonTransitionException ( Transition transition )
  {
    super ();
    // Transition
    if ( transition == null )
    {
      throw new NullPointerException ( "transition is null" ); //$NON-NLS-1$
    }
    this.transition = transition;
    // Message and description
    setPrettyMessage ( Messages
        .getPrettyString ( "MachineEpsilonTransitionException.Message" ) ); //$NON-NLS-1$
    setPrettyDescription ( Messages.getPrettyString (
        "MachineEpsilonTransitionException.Description", this.transition //$NON-NLS-1$
            .getStateBegin ().toPrettyString (), this.transition.getStateEnd ()
            .toPrettyString () ) );
  }


  /**
   * {@inheritDoc}
   * 
   * @see TransitionsInvolvedException#getTransition()
   */
  public final ArrayList < Transition > getTransition ()
  {
    ArrayList < Transition > result = new ArrayList < Transition > ( 1 );
    result.add ( this.transition );
    return result;
  }


  /**
   * {@inheritDoc}
   * 
   * @see CoreException#getType()
   */
  @Override
  public final ErrorType getType ()
  {
    return ErrorType.ERROR;
  }


  /**
   * {@inheritDoc}
   * 
   * @see Throwable#toString()
   */
  @Override
  public final String toString ()
  {
    String lineBreak = System.getProperty ( "line.separator" ); //$NON-NLS-1$
    StringBuilder result = new StringBuilder ( super.toString () );
    result.append ( lineBreak );
    result.append ( "Transition:  " ); //$NON-NLS-1$
    result.append ( this.transition.getStateBegin ().getName () );
    result.append ( " -> " ); //$NON-NLS-1$
    result.append ( this.transition.getStateEnd ().getName () );
    return result.toString ();
  }
}