filebrowser.js revision 970:f82b83cf73ae 
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
35if (!$OPTIONS._fx) {
36    print("Usage: jjs -fx filebrowser.js -- <start_dir>");
37    exit(1);
38}
39
40// Java classes used
41var File = Java.type("java.io.File");
42var Files = Java.type("java.nio.file.Files");
43
44// check directory argument, if passed
45var dir = arguments.length > 0? new File(arguments[0]) : new File(".");
46if (! dir.isDirectory()) {
47    print(dir + " is not a directory!");
48    exit(2);
49}
50
51// JavaFX classes used
52var FXCollections = Java.type("javafx.collections.FXCollections");
53var Scene     = Java.type("javafx.scene.Scene");
54var TreeItem  = Java.type("javafx.scene.control.TreeItem");
55var TreeView  = Java.type("javafx.scene.control.TreeView");
56
57// create a subclass of JavaFX TreeItem class
58var LazyTreeItem = Java.extend(TreeItem);
59
60// lazily filling children of a directory LazyTreeItem
61function 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
75function 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
93function 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}
101