package net.minecraft.commands;

@FunctionalInterface
public interface CommandResultCallback {
	CommandResultCallback EMPTY = new CommandResultCallback() {
		@Override
		public void onResult(final boolean success, final int result) {
		}

		public String toString() {
			return "<empty>";
		}
	};

	void onResult(boolean success, int result);

	default void onSuccess(final int result) {
		this.onResult(true, result);
	}

	default void onFailure() {
		this.onResult(false, 0);
	}

	static CommandResultCallback chain(final CommandResultCallback first, final CommandResultCallback second) {
		if (first == EMPTY) {
			return second;
		} else {
			return second == EMPTY ? first : (success, result) -> {
				first.onResult(success, result);
				second.onResult(success, result);
			};
		}
	}
}