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

 #// 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&mode=json&units=metric&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();

 }