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 }