/*

 * 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.

 *

 * 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.

 */

import javax.script.*;

/**

 * Helper class to consolidate testing requirements for a js engine.

 * A js engine is required as part of Oracle's product JDK.

 */

public class Helper {

    private Helper() {}; // Don't instantiate

    public static ScriptEngine getJsEngine(ScriptEngineManager m) {

        ScriptEngine e  = m.getEngineByName("nashorn");

        if (e == null &&

            System.getProperty("java.runtime.name").startsWith("Java(TM)")) {

            // A js engine is requied for Sun's product JDK

            throw new RuntimeException("no js engine found");

        }

        return e;

    }

}