nashorn/samples/javaconstructorbind.js
author duke
Thu, 24 Aug 2017 16:34:44 +0200
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Merge
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/*
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 * Copyright (c) 2015, 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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// bind on a Java constructor
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// See Function.prototype.bind:
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
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var bind = Function.prototype.bind;
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var URL = Java.type("java.net.URL");
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// get the constructor that accepts URL, String parameters.
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// constructor signatures are properties of type object.
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var newURL = URL["(URL, String)"];
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// bind "context" URL parameter.
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var TwitterURL = bind.call(newURL, null, new URL('https://www.twitter.com'));
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// now you can create context relative URLs using the bound constructor
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print(new TwitterURL("sundararajan_a"));
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// read the URL content and print (optional part)
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var BufferedReader = Java.type("java.io.BufferedReader");
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var InputStreamReader = Java.type("java.io.InputStreamReader");
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// function to retrieve text content of the given URL
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function readTextFromURL(url) {
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    var str = '';
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    var u = new URL(url);
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    var reader = new BufferedReader(
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        new InputStreamReader(u.openStream()));
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    try {
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        reader.lines().forEach(function(x) str += x);
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        return str;
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    } finally {
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        reader.close();
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    }
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}
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print(readTextFromURL(new TwitterURL("sundararajan_a")));