aoqi@0: #// Usage: jjs -fx jsonviewer.js
aoqi@0: // or
aoqi@0: //        jjs -fx jsonviewer.js -- <url-of-json-doc>
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
attila@962:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
attila@962:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
aoqi@0: if (! $OPTIONS._fx) {
aoqi@0:     print("Usage: jjs -fx jsonviewer.js -- <url-of-json-doc>");
aoqi@0:     exit(1);
aoqi@0: }
aoqi@0: 
aoqi@0: // This example downloads a JSON file from a URL and
aoqi@0: // shows the same as a JavaFX tree view.
aoqi@0: 
aoqi@0: // Using JavaFX from Nashorn. See also:
aoqi@0: // http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/javafx.html
aoqi@0: 
aoqi@0: // JavaFX classes used
aoqi@0: var StackPane = Java.type("javafx.scene.layout.StackPane");
aoqi@0: var Scene     = Java.type("javafx.scene.Scene");
aoqi@0: var TreeItem  = Java.type("javafx.scene.control.TreeItem");
aoqi@0: var TreeView  = Java.type("javafx.scene.control.TreeView");
aoqi@0: 
aoqi@0: // read text content of a URL
aoqi@0: function readTextFromURL(url) {
attila@962:     // equivalent to
attila@962:     //
aoqi@0:     //    import java.io.*;
aoqi@0:     //    import java.net.*;
aoqi@0:     //    import java.lang.StringBuffer;
aoqi@0:     //
aoqi@0:     // only inside the 'with' statement
aoqi@0:     with (new JavaImporter(java.io,
aoqi@0:         java.net,
aoqi@0:         java.lang.StringBuilder)) {
aoqi@0:         var buf = new StringBuilder();
aoqi@0:         var u = new URL(url);
aoqi@0:         var reader = new BufferedReader(
aoqi@0:             new InputStreamReader(u.openStream()));
aoqi@0:         var line = null;
aoqi@0:         try {
aoqi@0:             while ((line = reader.readLine()) != null)
aoqi@0:                 buf.append(line).append('\n');
aoqi@0:         } finally {
aoqi@0:             reader.close();
aoqi@0:         }
aoqi@0: 
aoqi@0:         return buf.toString();
aoqi@0:     }
aoqi@0: }
aoqi@0: 
aoqi@0: // Create a javafx TreeItem to view a script object
aoqi@0: function treeItemForObject(obj, name) {
aoqi@0:     var item = new TreeItem(name);
aoqi@0:     for (var prop in obj) {
aoqi@0:        var node = obj[prop];
aoqi@0:        if (typeof node == 'object') {
aoqi@0:            if (node == null) {
aoqi@0:                // skip nulls
aoqi@0:                continue;
aoqi@0:            }
aoqi@0: 
aoqi@0:            if (Array.isArray(node) && node.length == 0) {
aoqi@0:                // skip empty arrays
aoqi@0:                continue;
aoqi@0:            }
aoqi@0: 
aoqi@0:            var subitem = treeItemForObject(node, prop);
aoqi@0:        } else {
aoqi@0:            var subitem = new TreeItem(prop + ": " + node);
aoqi@0:        }
aoqi@0:        item.children.add(subitem);
aoqi@0:     }
aoqi@0:     return item;
aoqi@0: }
aoqi@0: 
aoqi@0: var DEFAULT_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?q=Chennai&amp;mode=json&amp;units=metric&amp;cnt=7`";
aoqi@0: 
aoqi@0: var url = arguments.length == 0? DEFAULT_URL : arguments[0];
aoqi@0: var obj = JSON.parse(readTextFromURL(url));
aoqi@0: 
aoqi@0: // JavaFX start method
aoqi@0: function start(stage) {
aoqi@0:     stage.title = "JSON Viewer";
aoqi@0:     var rootItem = treeItemForObject(obj, url);
aoqi@0:     var tree = new TreeView(rootItem);
aoqi@0:     var root = new StackPane();
aoqi@0:     root.children.add(tree);
aoqi@0:     stage.scene = new Scene(root, 300, 450);
aoqi@0:     stage.show();
aoqi@0: }