1 #// Usage: jjs -scripting -cp . jsobject.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 // This sample demonstrats how to expose a
  35 // script friendly object from your java code
  36 // by implementing jdk.nashorn.api.scripting.JSObject
  37 
  38 // compile the java program
  39 `javac BufferArray.java`;
  40 
  41 // print error, if any and exit
  42 if ($ERR != '') {
  43     print($ERR);
  44     exit($EXIT);
  45 }
  46 
  47 // create BufferArray
  48 var BufferArray = Java.type("BufferArray");
  49 var bb = new BufferArray(10);
  50 
  51 // 'magic' methods called to retrieve set/get
  52 // properties on BufferArray instance
  53 var len = bb.length;
  54 print("bb.length = " + len)
  55 for (var i = 0; i < len; i++) {
  56     bb[i] = i*i;
  57 }
  58 
  59 for (var i = 0; i < len; i++) {
  60     print(bb[i]);
  61 }
  62 
  63 // get underlying buffer by calling a method
  64 // on BufferArray magic object
  65 
  66 // 'buf' is a function member
  67 print(typeof bb.buf);
  68 var buf = bb.buf();
  69 
  70 // use retrieved underlying nio buffer
  71 var cap = buf.capacity();
  72 print("buf.capacity() = " + cap);
  73 for (var i = 0; i < cap; i++) {
  74    print(buf.get(i));
  75 }