| #// 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?q=chennai,india&units=metric&mode=json&appid=9b2982987c080ae88d81f081dcb129e8"; |
| |
| 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(); |
| } |