1 #// usage: jjs -scripting weather.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 // Simple nashorn example showing back-quote exec process, 35 // JSON and Java8 streams 36 37 var Arrays = Java.type("java.util.Arrays"); 38 39 // use curl to download JSON weather data from the net 40 // use backquote -scripting mode syntax to exec a process 41 42 `curl http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&mode=json&units=metric&cnt=7`; 43 44 // parse JSON 45 var weather = JSON.parse($OUT); 46 47 // pull out humidity as array 48 var humidity = weather.list.map(function(curVal) { 49 return curVal.humidity; 50 }) 51 52 // Stream API to print stat 53 print("Humidity"); 54 print(Arrays["stream(int[])"](humidity).summaryStatistics()); 55 56 // pull maximum day time temperature 57 var temp = weather.list.map(function(curVal) { 58 return curVal.temp.max; 59 }); 60 61 // Stream API to print stat 62 print("Max Temperature"); 63 print(Arrays["stream(double[])"](temp).summaryStatistics());