1 #// usage: jjs -scripting weather.js

     2 

     3 /*

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     5  * 

     6  * Redistribution and use in source and binary forms, with or without

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    13  *   - Redistributions in binary form must reproduce the above copyright

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    17  *   - Neither the name of Oracle nor the names of its

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    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());