set Metadata to TableColumn

bogwalrus

I am trying to find the best way to get metadata from a media source and present it in a table. I can use the getMetadata() method on a value that returns an ObservableMap but not really sure what should be in my CellFactory.

TableColumn<Media> artist = new TableColumn<Media>();
artist.setCellFactory(????)

Maybe I can populate the tablecolumns using TableView?

Cheers,
Boggy

Graham

Cool, I haven't played guess the platform/database/language in ages.:pac:

TrueDub

It's Java, and I'd hazard a guess it's one of the no-SQL libraries, but which one? The tension is high....

OP, please give us full details of what you're trying to do and with what technologies, libraries and frameworks, otherwise we cannot assist.

bogwalrus

Sorry. Brain fried a bit from staring at screen. Only had two coffees also:o

It is indeed java.
I have an ObservableList of Media types in a library class that I want to get metadata from.

My closest attempt is as follows:

TableView<Media> tableView = new TableView<Media>();
tableView.setItems(myLib.getObsList());

TableColumn<Media,String> artistCol= new TableColumn<Media,String>("Artist");
        artistCol.setCellValueFactory(new Callback<CellDataFeatures<Media, String>, ObservableValue<String>>() {
                public ObservableValue<String> call(CellDataFeatures<Media, String> m) {
                   
                    return m.getValue().getMetadata().get("artist");
                }
            });

tableView.getColumns().setAll(artistCol);

The issue now is the type that is returned does not match:

java.lang.Object cannot be converted to javafx.beans.value.ObservableValue

bogwalrus

I made some progress. Now I can add one value to a cell but cant seem to group a few together. I tried adding to a string but it does not show up in the cell. I imagine it has to do with the way observers work.

I want the cell to print the following:

Artist: value
Year: Value
ALbum: value

listView = new ListView<Media>(myLib.getObsList());
        listView.setCellFactory(new Callback<ListView<Media>, ListCell<Media>>() {
                @Override
                public ListCell<Media> call(ListView<Media> myObjectListView) {
                    ListCell<Media> cell = new ListCell<Media>(){
                            @Override
                            protected void updateItem(Media myObject, boolean b) {
                                super.updateItem(myObject, b);

                                if(myObject != null) {
                                    ObservableMap<String, Object> m = myObject.getMetadata();
                                    m.addListener(new MapChangeListener<String,Object>(){
                                            @Override
                                            public void onChanged(Change<? extends String, ? extends Object> ch) {  

                                                String key = ch.getKey();
                                                Object value = ch.getValueAdded();
                                                
                                                if(key.equals(value)){

                                                    setText(value.toString());
                                                }


                                            }});
                                }
                            }
                        };

                    return cell;
                }
            });

cheers,
Boggy