Mercurial > jdk8-mips64-public > nashorn / file revision

 #// Usage: jjs -fx filebrowser.js -- <start_dir>

 /*

  * 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.

  */

 // Uses -fx and javafx TreeView to visualize directories

 if (!$OPTIONS._fx) {

     print("Usage: jjs -fx filebrowser.js -- <start_dir>");

     exit(1);

 }

 // Java classes used

 var File = Java.type("java.io.File");

 var Files = Java.type("java.nio.file.Files");

 // check directory argument, if passed

 var dir = arguments.length > 0? new File(arguments[0]) : new File(".");

 if (! dir.isDirectory()) {

     print(dir + " is not a directory!");

     exit(2);

 }

 // JavaFX classes used

 var FXCollections = Java.type("javafx.collections.FXCollections");

 var Scene     = Java.type("javafx.scene.Scene");

 var TreeItem  = Java.type("javafx.scene.control.TreeItem");

 var TreeView  = Java.type("javafx.scene.control.TreeView");

 // create a subclass of JavaFX TreeItem class

 var LazyTreeItem = Java.extend(TreeItem);

 // lazily filling children of a directory LazyTreeItem

 function buildChildren(dir) {

     var children = FXCollections.observableArrayList();

     var stream = Files.list(dir.toPath());

     stream.forEach(function(path) {

         var file = path.toFile();

         var item = file.isDirectory()?

             makeLazyTreeItem(file) : new TreeItem(file.name);

         children.add(item);

     });

     stream.close();

     return children;

 }

 // create an instance LazyTreeItem with override methods

 function makeLazyTreeItem(dir) {

     var item = new LazyTreeItem(dir.name) {

         expanded: false,

         isLeaf: function() false,

         getChildren: function() {

             if (! this.expanded) {

                 // call super class (TreeItem) method

                 Java.super(item).getChildren().setAll(buildChildren(dir));

                 this.expanded = true;

             }

             // call super class (TreeItem) method

             return Java.super(item).getChildren();

         }

     }

     return item;

 }

 // JavaFX start method

 function start(stage) {

     stage.title = dir.absolutePath;

     var rootItem = makeLazyTreeItem(dir);

     rootItem.expanded = true;

     var tree = new TreeView(rootItem);

     stage.scene = new Scene(tree, 300, 450);

     stage.show();

 }