Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: samples/jsonviewer.js

samples/jsonviewer.js

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1 #// Usage: jjs -fx jsonviewer.js
2 // or
3 // jjs -fx jsonviewer.js -- <url-of-json-doc>
4
5 /*
6 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * - Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * - Neither the name of Oracle nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
24 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
25 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 if (! $OPTIONS._fx) {
37 print("Usage: jjs -fx jsonviewer.js -- <url-of-json-doc>");
38 exit(1);
39 }
40
41 // This example downloads a JSON file from a URL and
42 // shows the same as a JavaFX tree view.
43
44 // Using JavaFX from Nashorn. See also:
45 // http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/javafx.html
46
47 // JavaFX classes used
48 var StackPane = Java.type("javafx.scene.layout.StackPane");
49 var Scene = Java.type("javafx.scene.Scene");
50 var TreeItem = Java.type("javafx.scene.control.TreeItem");
51 var TreeView = Java.type("javafx.scene.control.TreeView");
52
53 // read text content of a URL
54 function readTextFromURL(url) {
55 // equivalent to
56 //
57 // import java.io.*;
58 // import java.net.*;
59 // import java.lang.StringBuffer;
60 //
61 // only inside the 'with' statement
62 with (new JavaImporter(java.io,
63 java.net,
64 java.lang.StringBuilder)) {
65 var buf = new StringBuilder();
66 var u = new URL(url);
67 var reader = new BufferedReader(
68 new InputStreamReader(u.openStream()));
69 var line = null;
70 try {
71 while ((line = reader.readLine()) != null)
72 buf.append(line).append('\n');
73 } finally {
74 reader.close();
75 }
76
77 return buf.toString();
78 }
79 }
80
81 // Create a javafx TreeItem to view a script object
82 function treeItemForObject(obj, name) {
83 var item = new TreeItem(name);
84 for (var prop in obj) {
85 var node = obj[prop];
86 if (typeof node == 'object') {
87 if (node == null) {
88 // skip nulls
89 continue;
90 }
91
92 if (Array.isArray(node) && node.length == 0) {
93 // skip empty arrays
94 continue;
95 }
96
97 var subitem = treeItemForObject(node, prop);
98 } else {
99 var subitem = new TreeItem(prop + ": " + node);
100 }
101 item.children.add(subitem);
102 }
103 return item;
104 }
105
106 var DEFAULT_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&amp;mode=json&amp;units=metric&amp;cnt=7`";
107
108 var url = arguments.length == 0? DEFAULT_URL : arguments[0];
109 var obj = JSON.parse(readTextFromURL(url));
110
111 // JavaFX start method
112 function start(stage) {
113 stage.title = "JSON Viewer";
114 var rootItem = treeItemForObject(obj, url);
115 var tree = new TreeView(rootItem);
116 var root = new StackPane();
117 root.children.add(tree);
118 stage.scene = new Scene(root, 300, 450);
119 stage.show();
120 }

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