1 #// Usage: jjs -scripting callmethod.js
   2 
   3 /*
   4  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  *   - Redistributions of source code must retain the above copyright
  11  *     notice, this list of conditions and the following disclaimer.
  12  *
  13  *   - Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  *
  17  *   - Neither the name of Oracle nor the names of its
  18  *     contributors may be used to endorse or promote products derived
  19  *     from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  22  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 
  34 // simple example demonstrating calling a script object
  35 // method from script engine user code
  36 
  37 var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");
  38 // create manager
  39 var manager = new ScriptEngineManager();
  40 // create engine
  41 var engine = manager.getEngineByName("js");
  42 
  43 // eval code - too many script escapes?
  44 // use heredoc !
  45 engine.eval(<<CODE
  46     var obj = {
  47         func: function() {
  48             print("I am func of " + this);
  49         },
  50 
  51         toString: function() {
  52             return "Object 'obj'";
  53         }
  54    };
  55 CODE);
  56 
  57 // invoke methods of an object in script world
  58 // from javax.script.Invocable interface. But, hey,
  59 // calling code is JavaScript and don't worry about types :)
  60 
  61 // get that script object on which to call a method
  62 var scriptObj = engine.get("obj");
  63 // call 'func' method on object 'obj'
  64 engine.invokeMethod(scriptObj, "func");