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package aQute.bnd.exceptions;

import static java.util.Objects.requireNonNull;

import java.util.function.Supplier;

/**
 * Supplier interface that allows exceptions.
 *
 * @param  the result type
 */
@FunctionalInterface
public interface SupplierWithException {
	R get() throws Exception;

	default Supplier orElseThrow() {
		return () -> {
			try {
				return get();
			} catch (Exception e) {
				throw Exceptions.duck(e);
			}
		};
	}

	default Supplier orElse(R orElse) {
		return () -> {
			try {
				return get();
			} catch (Exception e) {
				return orElse;
			}
		};
	}

	default Supplier orElseGet(Supplier orElseGet) {
		requireNonNull(orElseGet);
		return () -> {
			try {
				return get();
			} catch (Exception e) {
				return orElseGet.get();
			}
		};
	}

	static  Supplier asSupplier(SupplierWithException unchecked) {
		return unchecked.orElseThrow();
	}

	static  Supplier asSupplierOrElse(SupplierWithException unchecked, R orElse) {
		return unchecked.orElse(orElse);
	}

	static  Supplier asSupplierOrElseGet(SupplierWithException unchecked, Supplier orElseGet) {
		return unchecked.orElseGet(orElseGet);
	}
}