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