ATM Simulation Implementation - the Envelope Acceptor

/*
 * Example ATM simulation - file EnvelopeAcceptor.java
 *
 * This file implements the class that manages the ATM's envelope acceptor
 *
 * Copyright (c) 1997 - Russell C. Bjork
 *
 */

package atm.atmparts;
import java.awt.*;

//

Class EnvelopeAcceptor

public class EnvelopeAcceptor extends Button
  {     

    //

    public EnvelopeAcceptor()
      { super("Click to insert Envelope");
        _originalBounds = null;  // Must get this after GUI is all laid out
      }
    
    //

    public synchronized boolean acceptEnvelope()
      { 
        if (_originalBounds == null)
            _originalBounds = bounds();
        else
            reshape(_originalBounds.x, _originalBounds.y,
                    _originalBounds.width, _originalBounds.height);

        show();
        repaint();
        requestFocus();
                                
        // Wait for user to simulate inserting envelope by clicking button.
        // If we wait 20 seconds and no envelope is entered, we time out

        try
          { wait(20 * 1000); }
        catch(InterruptedException e)
          { }

        if (! _inserted)
          { hide();
            return _inserted;
          }
          
        // Animate envelope going into the machine
        
        Rectangle currentBounds =
           new Rectangle(_originalBounds.x, _originalBounds.y,
                         _originalBounds.width, _originalBounds.height);
                         
        while (currentBounds.width > 0 && currentBounds.height > 0)
          { reshape(currentBounds.x, currentBounds.y,
                    currentBounds.width, currentBounds.height);
            repaint();
            try 
              { Thread.sleep(100); } 
            catch (InterruptedException e) 
              { }
            currentBounds.height -= 1;
            currentBounds.width = 
              (_originalBounds.width * currentBounds.height) / _originalBounds.height;
            currentBounds.x =
              _originalBounds.x + (_originalBounds.width - currentBounds.width) / 2;
            currentBounds.y =
              _originalBounds.y + (_originalBounds.height - currentBounds.height) / 2;
          }
          
        hide();
        
        return _inserted;
      }
      
    //

    // Method and private data needed for GUI

    public synchronized boolean action(Event e, Object arg)
      { if (e.target == this)
          { _inserted = true;
            notify();
            return true;
          }
        else
            return false;
      }    

    private Rectangle _originalBounds;
    private boolean _inserted;
  }
  
//