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package gregtech.api.util;
import java.util.Arrays;
import java.util.function.Supplier;
import java.util.stream.Stream;
import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;
@ParametersAreNonnullByDefault
@MethodsReturnNonnullByDefault
public final class GTStreamUtil {
/**
* Backport of {@link Stream#ofNullable}.
*/
public static <T> Stream<T> ofNullable(@Nullable T value) {
return value == null ? Stream.empty() : Stream.of(value);
}
/**
* Returns a sequential ordered {@code Stream} whose elements are the specified values,
* if {@code condition} is true, otherwise returns an empty {@code Stream}.
*
* @param <T> the type of stream elements
* @param values the elements of the new stream
* @return the new stream
*/
public static <T> Stream<T> ofConditional(boolean condition, T[] values) {
return condition ? Arrays.stream(values) : Stream.empty();
}
/**
* Returns a sequential {@code Stream} containing a single element, which will be lazily evaluated from supplier.
*
* @param <T> the type of stream elements
* @param supplier the supplier for single stream element
* @return the new stream
*/
public static <T> Stream<T> ofSupplier(Supplier<T> supplier) {
return Stream.generate(supplier)
.limit(1);
}
}
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