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/*
 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.scenario.effect.impl.state;

import com.sun.scenario.effect.Effect;

public class AccessHelper {

    /**
     * Provides access to implementation details in
     * com.sun.scenario.effect package.
     */
    public interface StateAccessor {
        public Object getState(Effect effect);
    }

    private static StateAccessor theStateAccessor;

    public static void setStateAccessor(StateAccessor accessor) {
        if (theStateAccessor != null) {
            throw new InternalError("EffectAccessor already initialized");
        }
        theStateAccessor = accessor;
    }

    public static Object getState(Effect effect) {
        if (effect == null) {
            return null;
        }
        return theStateAccessor.getState(effect);
    }
}