1 #// Usage: jjs -fx filebrowser.js -- <start_dir>
   2 
   3 /*
   4  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  *   - Redistributions of source code must retain the above copyright
  11  *     notice, this list of conditions and the following disclaimer.
  12  *
  13  *   - Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  *
  17  *   - Neither the name of Oracle nor the names of its
  18  *     contributors may be used to endorse or promote products derived
  19  *     from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  22  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 
  34 // Uses -fx and javafx TreeView to visualize directories
  35 if (!$OPTIONS._fx) {
  36     print("Usage: jjs -fx filebrowser.js -- <start_dir>");
  37     exit(1);
  38 }
  39 
  40 // Java classes used
  41 var File = Java.type("java.io.File");
  42 var Files = Java.type("java.nio.file.Files");
  43 
  44 // check directory argument, if passed
  45 var dir = arguments.length > 0? new File(arguments[0]) : new File(".");
  46 if (! dir.isDirectory()) {
  47     print(dir + " is not a directory!");
  48     exit(2);
  49 }
  50 
  51 // JavaFX classes used
  52 var FXCollections = Java.type("javafx.collections.FXCollections");
  53 var Scene     = Java.type("javafx.scene.Scene");
  54 var TreeItem  = Java.type("javafx.scene.control.TreeItem");
  55 var TreeView  = Java.type("javafx.scene.control.TreeView");
  56 
  57 // create a subclass of JavaFX TreeItem class
  58 var LazyTreeItem = Java.extend(TreeItem);
  59 
  60 // lazily filling children of a directory LazyTreeItem
  61 function buildChildren(dir) {
  62     var children = FXCollections.observableArrayList();
  63     var stream = Files.list(dir.toPath());
  64     stream.forEach(function(path) {
  65         var file = path.toFile();
  66         var item = file.isDirectory()?
  67             makeLazyTreeItem(file) : new TreeItem(file.name);
  68         children.add(item);
  69     });
  70     stream.close();
  71     return children;
  72 }
  73 
  74 // create an instance LazyTreeItem with override methods
  75 function makeLazyTreeItem(dir) {
  76     var item = new LazyTreeItem(dir.name) {
  77         expanded: false,
  78         isLeaf: function() false,
  79         getChildren: function() {
  80             if (! this.expanded) {
  81                 // call super class (TreeItem) method
  82                 Java.super(item).getChildren().setAll(buildChildren(dir));
  83                 this.expanded = true;
  84             }
  85             // call super class (TreeItem) method
  86             return Java.super(item).getChildren();
  87         }
  88     }
  89     return item;
  90 }
  91 
  92 // JavaFX start method
  93 function start(stage) {
  94     stage.title = dir.absolutePath;
  95     var rootItem = makeLazyTreeItem(dir);
  96     rootItem.expanded = true;
  97     var tree = new TreeView(rootItem);
  98     stage.scene = new Scene(tree, 300, 450);
  99     stage.show();
 100 }