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&mode=json&units=metric&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 }