nashorn/samples/javaconstructorbind.js
author sundar
Fri, 04 Sep 2015 17:11:06 +0530
changeset 32523 d8e365854b3c
parent 31485 be1acaee8e9e
permissions -rw-r--r--
8135054: Add more samples to nashorn samples directory Reviewed-by: mhaupt, hannesw

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// bind on a Java constructor

// See Function.prototype.bind:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
var bind = Function.prototype.bind;

var URL = Java.type("java.net.URL");

// get the constructor that accepts URL, String parameters.
// constructor signatures are properties of type object.
var newURL = URL["(URL, String)"];

// bind "context" URL parameter.
var TwitterURL = bind.call(newURL, null, new URL('https://www.twitter.com'));

// now you can create context relative URLs using the bound constructor
print(new TwitterURL("sundararajan_a"));

// read the URL content and print (optional part)

var BufferedReader = Java.type("java.io.BufferedReader");
var InputStreamReader = Java.type("java.io.InputStreamReader");

// function to retrieve text content of the given URL
function readTextFromURL(url) {
    var str = '';
    var u = new URL(url);
    var reader = new BufferedReader(
        new InputStreamReader(u.openStream()));
    try {
        reader.lines().forEach(function(x) str += x);
        return str;
    } finally {
        reader.close();
    }
}

print(readTextFromURL(new TwitterURL("sundararajan_a")));