sundar@1524: /*
sundar@1524:  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
sundar@1524:  *
sundar@1524:  * Redistribution and use in source and binary forms, with or without
sundar@1524:  * modification, are permitted provided that the following conditions
sundar@1524:  * are met:
sundar@1524:  *
sundar@1524:  *   - Redistributions of source code must retain the above copyright
sundar@1524:  *     notice, this list of conditions and the following disclaimer.
sundar@1524:  *
sundar@1524:  *   - Redistributions in binary form must reproduce the above copyright
sundar@1524:  *     notice, this list of conditions and the following disclaimer in the
sundar@1524:  *     documentation and/or other materials provided with the distribution.
sundar@1524:  *
sundar@1524:  *   - Neither the name of Oracle nor the names of its
sundar@1524:  *     contributors may be used to endorse or promote products derived
sundar@1524:  *     from this software without specific prior written permission.
sundar@1524:  *
sundar@1524:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
sundar@1524:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
sundar@1524:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sundar@1524:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
sundar@1524:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sundar@1524:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
sundar@1524:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
sundar@1524:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
sundar@1524:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
sundar@1524:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
sundar@1524:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
sundar@1524:  */
sundar@1524: 
sundar@1524: import javax.script.*;
sundar@1524: import java.util.function.*;
sundar@1524: 
sundar@1524: // example demonstrating that arbitrary Lambda can be called as function from script
sundar@1524: 
sundar@1524: public class LambdaAsFunc {
sundar@1524:     public static void main(String[] args) throws Exception {
sundar@1524:         ScriptEngineManager m = new ScriptEngineManager();
sundar@1524:         ScriptEngine e = m.getEngineByName("nashorn");
sundar@1524: 
sundar@1524:         // expose a lambda as top-level script function
sundar@1524:         e.put("upper", (Function<String, String>) String::toUpperCase);
sundar@1524: 
sundar@1524:         // call lambda as though it is a normal script function
sundar@1524:         System.out.println(e.eval("upper('hello')"));
sundar@1524:     }
sundar@1524: }