jsonviewer.js revision 970:f82b83cf73ae 
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
36if (! $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
48var StackPane = Java.type("javafx.scene.layout.StackPane");
49var Scene     = Java.type("javafx.scene.Scene");
50var TreeItem  = Java.type("javafx.scene.control.TreeItem");
51var TreeView  = Java.type("javafx.scene.control.TreeView");
52
53// read text content of a URL
54function 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
82function 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
106var DEFAULT_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&mode=json&units=metric&cnt=7`";
107
108var url = arguments.length == 0? DEFAULT_URL : arguments[0];
109var obj = JSON.parse(readTextFromURL(url));
110
111// JavaFX start method
112function 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}
121