SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.jdwp.host;

import cc.squirreljme.jdwp.host.trips.JDWPTrip;
import java.lang.ref.Reference;

/**
 * The base class for trip handlers.
 *
 * @since 2021/04/11
 */
abstract class __TripBase__
    implements JDWPTrip
{
    /** The controller reference. */
    private final Reference<JDWPHostController> _controller;
    
    /**
     * Initializes the trip base.
     * 
     * @param __controller The controller used.
     * @throws NullPointerException On null arguments.
     * @since 2021/04/11
     */
    __TripBase__(Reference<JDWPHostController> __controller)
        throws NullPointerException
    {
        if (__controller == null)
            throw new NullPointerException("NARG");
        
        this._controller = __controller;
    }
    
    /**
     * Returns the debug controller.
     * 
     * @return The debug controller.
     * @since 2021/04/11
     */
    final JDWPHostController __controller()
    {
        /* {@squirreljme.error AG0n The debug controller was garbage
        collected.} */
        JDWPHostController rv = this._controller.get();
        if (rv == null)
            throw new IllegalStateException("AG0n");
        
        return rv;
    }
}