test/javax/script/Helper.java

/*
 * 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;
    }
}