nashorn/samples/jsobject.js
author cjplummer
Sat, 06 May 2017 00:05:32 +0000
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#// Usage: jjs -scripting -cp . jsobject.js
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/*
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 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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// This sample demonstrats how to expose a
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// script friendly object from your java code
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// by implementing jdk.nashorn.api.scripting.JSObject
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// compile the java program
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`javac BufferArray.java`;
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// print error, if any and exit
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if ($ERR != '') {
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    print($ERR);
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    exit($EXIT);
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}
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// create BufferArray
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var BufferArray = Java.type("BufferArray");
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var bb = new BufferArray(10);
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// 'magic' methods called to retrieve set/get
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// properties on BufferArray instance
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var len = bb.length;
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print("bb.length = " + len)
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for (var i = 0; i < len; i++) {
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    bb[i] = i*i;
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}
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for (var i = 0; i < len; i++) {
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    print(bb[i]);
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}
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// get underlying buffer by calling a method
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// on BufferArray magic object
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// 'buf' is a function member
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print(typeof bb.buf);
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var buf = bb.buf();
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// use retrieved underlying nio buffer
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var cap = buf.capacity();
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print("buf.capacity() = " + cap);
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for (var i = 0; i < cap; i++) {
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   print(buf.get(i));
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}