com.zepben.util.OptionalHelpers Maven / Gradle / Ivy
/*
* Copyright 2020 Zeppelin Bend Pty Ltd
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
package com.zepben.util;
import com.zepben.annotations.EverythingIsNonnullByDefault;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Stream;
@EverythingIsNonnullByDefault
@SuppressWarnings("WeakerAccess")
public abstract class OptionalHelpers {
@SafeVarargs
public static Optional firstOf(Supplier>... suppliers) {
return Stream
.of(suppliers)
.map(Supplier::get)
.filter(Optional::isPresent)
.map(Optional::get)
.findFirst();
}
}