jdk8-mips64-public/nashorn: samples/jsonviewer.js@2f1b9f4daec1 (annotated)

samples/jsonviewer.js@2f1b9f4daec1 (annotated)

samples/jsonviewer.js

Fri, 05 Jun 2015 12:38:53 +0200

author: mhaupt
date: Fri, 05 Jun 2015 12:38:53 +0200
changeset 1398: 2f1b9f4daec1
parent 962: ac62e33a99b0
permissions: -rw-r--r--

8080087: Nashorn $ENV.PWD is originally undefined
Summary: On Windows, the PWD environment variable does not exist and cannot be imported in scripting mode, so it is set explicitly.
Reviewed-by: lagergren, sundar

 #// Usage: jjs -fx jsonviewer.js
 // or
 //        jjs -fx jsonviewer.js -- <url-of-json-doc>
 /*
  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * 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
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 if (! $OPTIONS._fx) {
     print("Usage: jjs -fx jsonviewer.js -- <url-of-json-doc>");
     exit(1);
 }
 // This example downloads a JSON file from a URL and
 // shows the same as a JavaFX tree view.
 // Using JavaFX from Nashorn. See also:
 // http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/javafx.html
 // JavaFX classes used
 var StackPane = Java.type("javafx.scene.layout.StackPane");
 var Scene     = Java.type("javafx.scene.Scene");
 var TreeItem  = Java.type("javafx.scene.control.TreeItem");
 var TreeView  = Java.type("javafx.scene.control.TreeView");
 // read text content of a URL
 function readTextFromURL(url) {
     // equivalent to
     //
     //    import java.io.*;
     //    import java.net.*;
     //    import java.lang.StringBuffer;
     //
     // only inside the 'with' statement
     with (new JavaImporter(java.io,
         java.net,
         java.lang.StringBuilder)) {
         var buf = new StringBuilder();
         var u = new URL(url);
         var reader = new BufferedReader(
             new InputStreamReader(u.openStream()));
         var line = null;
         try {
             while ((line = reader.readLine()) != null)
                 buf.append(line).append('\n');
         } finally {
             reader.close();
         }
         return buf.toString();
     }
 }
 // Create a javafx TreeItem to view a script object
 function treeItemForObject(obj, name) {
     var item = new TreeItem(name);
     for (var prop in obj) {
        var node = obj[prop];
        if (typeof node == 'object') {
            if (node == null) {
                // skip nulls
                continue;
            }
            if (Array.isArray(node) && node.length == 0) {
                // skip empty arrays
                continue;
            }
            var subitem = treeItemForObject(node, prop);
        } else {
            var subitem = new TreeItem(prop + ": " + node);
        }
        item.children.add(subitem);
     }
     return item;
 }
 var DEFAULT_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&amp;mode=json&amp;units=metric&amp;cnt=7`";
 var url = arguments.length == 0? DEFAULT_URL : arguments[0];
 var obj = JSON.parse(readTextFromURL(url));
 // JavaFX start method
 function start(stage) {
     stage.title = "JSON Viewer";
     var rootItem = treeItemForObject(obj, url);
     var tree = new TreeView(rootItem);
     var root = new StackPane();
     root.children.add(tree);
     stage.scene = new Scene(root, 300, 450);
     stage.show();
 }