nashorn/samples/weather.js
author ascarpino
Tue, 01 Jul 2014 09:46:20 -0700
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permissions -rw-r--r--
8015081: javax.security.auth.Subject.toString() throws NPE Reviewed-by: xuelei, weijun Contributed-by: Jamil Nimeh <jamil.j.nimeh@oracle.com>
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#// usage: jjs -scripting weather.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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// Simple nashorn example showing back-quote exec process,
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// JSON and Java8 streams
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var Arrays = Java.type("java.util.Arrays");
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// use curl to download JSON weather data from the net
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// use backquote -scripting mode syntax to exec a process
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`curl http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&amp;mode=json&amp;units=metric&amp;cnt=7`;
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// parse JSON
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var weather = JSON.parse($OUT);
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// pull out humidity as array
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var humidity = weather.list.map(function(curVal) {
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    return curVal.humidity;
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})
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// Stream API to print stat
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print("Humidity");
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print(Arrays["stream(int[])"](humidity).summaryStatistics());
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// pull maximum day time temperature
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var temp = weather.list.map(function(curVal) {
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    return curVal.temp.max;
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});
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// Stream API to print stat
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print("Max Temperature");
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print(Arrays["stream(double[])"](temp).summaryStatistics());