Getting filename that was used on setGraphic() - javafx-8

Question

I am currently working on a puzzle type of app on javaFX. I created a 2d array of buttons that I used setGraphic to insert the pictures. I am wondering if there is a way to retrieve the filename that I used on setGraphic so I can compare to pictures together. I know there is a getGraphic method but that returns random numbers.

Answer 1

setGraphic takes a Node, not a Image object; I assume you use ImageViews as graphics.
There is no way to retrieve the file name from an Image object since you need not pass a url to the Image constructor but are also allowed to pass a InputStream. InputStream does not provide any information about it's source and Image also doesn't.
To get the file path from a image you need to store the information yourself, e.g.:
private final Map<Image, String> imageFileNames = new IdentityHashMap<>();
public Image loadImage(String filename) throws MalformedURLException {
File file = new File(filename);
Image image = new Image(file.toURI().toURL().toExternalForm());
imageFileNames.put(image, filename);
return image;
}
public String getImageFileName(Image image) {
return imageFileNames.get(image);
}
With a node containing a ImageView as a graphic, you could do something like this:
ImageView view = (ImageView) node.getGraphic();
Image img = view.getImage();
String fileName = getImageFieldName(img);
Possibly adding null checks, if the graphic and/or the image can be null.
You could also the data in the node's userData or properties if you like:
Storing
File file = new File(filename);
ImageView imageView = new ImageView(file.toURI().toURL().toExternalForm());
imageView.setUserData(filename);
Retrieving
String filename = (String) node.getGraphic().getUserData();