/**

 * HTML via Java(tm) Language Bindings

 * Copyright (C) 2013 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program 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 for more details. apidesign.org

 * designates this particular file as subject to the

 * "Classpath" exception as provided by apidesign.org

 * in the License file that accompanied this code.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://wiki.apidesign.org/wiki/GPLwithClassPathException

 */

package org.apidesign.html.boot.impl;

import org.apidesign.html.boot.spi.Fn;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public final class FnContext {

    private FnContext() {

    }

    private static final ThreadLocal<Fn.Presenter> CURRENT = new ThreadLocal<Fn.Presenter>();

    public static Fn.Presenter currentPresenter(Fn.Presenter p) {

        Fn.Presenter prev = CURRENT.get();

        CURRENT.set(p);

        return prev;

    }

    public static Fn.Presenter currentPresenter() {

        Fn.Presenter p = CURRENT.get();

        if (p == null) {

            throw new IllegalStateException("No current WebView context around!");

        }

        return p;

    }

}