public static ReadableProperty empty()

in model/src/main/java/jetbrains/jetpad/model/property/Properties.java [586:615]

• 26 lines of code
• 1 McCabe index (conditional complexity)

  public static <ItemT> ReadableProperty<Boolean> empty(final ObservableCollection<ItemT> collection) {
    return new BaseDerivedProperty<Boolean>(collection.isEmpty()) {
      private Registration myCollectionRegistration;

      @Override
      protected void doAddListeners() {
        myCollectionRegistration = collection.addListener(Properties.simpleAdapter(new Runnable() {
          @Override
          public void run() {
            somethingChanged();
          }
        }));
      }

      @Override
      protected void doRemoveListeners() {
        myCollectionRegistration.remove();
      }

      @Override
      protected Boolean doGet() {
        return collection.isEmpty();
      }

      @Override
      public String getPropExpr() {
        return "empty(" + collection + ")";
      }
    };
  }