#// 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();

}