/*
 * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.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 Sun's product JDK.
 */
public class Helper {
    private Helper() {}; // Don't instantiate

    public static ScriptEngine getJsEngine(ScriptEngineManager m) {
	ScriptEngine e  = m.getEngineByName("js");
	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;
    }
}