// FieldButton.java Copyright (c) 2004 brising.com

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeSupport;

/**
I am a button out in the middle of the game's button matrix.
I am either black (untested),
blue (tested and occupied),
or yellow (tested and unoccupied).
*/
public
    class       FieldButton
    extends     GameButton
    {
// STATIC VARIABLES ///////////////////////////////////////////////////////////

    static public final String gksUpdateFound = "updateFound";

// INSTANCE VARIABLES /////////////////////////////////////////////////////////

    boolean hyOccupied;

// PUBLIC INSTANCE METHODS ////////////////////////////////////////////////////

    /**
    See if I am occupied.
    Turn blue if I am, or yellow if I am not.
    */
    public
        void        actionPerformed
        (
        ActionEvent aoActionEvent
        )
        {
        if (this.hasBackgroundDefault())
            {
            if (isOccupied())
                {
                setBackground(Color.blue);
                gkoPropertyChangeSupport
                    .firePropertyChange(gksUpdateFound,null,null);
                }
            else
                {
                setBackground(Color.yellow);
                changeScore();
                }
            }
        }

    /**
    My default background color is black.
    */
    public
        Color   getBackgroundDefault
        (
        )
        {
        return Color.black;
        }

    /**
    How many points do I subtract from the game's score if I am unoccupied?
    */
    public
        int     getScore
        (
        )
        {
        return 5;
        }

    /**
    Am I occupied?
    */
    public
        boolean isOccupied
        (
        )
        {
        return hyOccupied;
        }

    /**
    Do Photons propagate through me?
    */
    public
        boolean isPropagating
        (
        )
        {
        return !this.isOccupied();
        }

    public
        void    reset
        (
        )
        {
        super.reset();
        setOccupied(false);
        }

    public
        void    setOccupied
        (
        boolean ay
        )
        {
        hyOccupied = ay;
        }

    public
        void    terminate
        (
        )
        {
        // do nothing
        }
    }