StreamUtils.java
/*
* Copyright (c) 2021 Mārtiņš Avots (Martins Avots) and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0, or the MIT License,
* which is available at https://spdx.org/licenses/MIT.html.
*
* SPDX-License-Identifier: EPL-2.0 OR MIT
*/
package net.splitcells.dem.utils;
import java.util.Collections;
import java.util.function.BinaryOperator;
import java.util.stream.Stream;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toList;
import static net.splitcells.dem.utils.ConstructorIllegal.constructorIllegal;
public final class StreamUtils {
private StreamUtils() {
throw constructorIllegal();
}
public static <T> Stream<T> reverse(Stream<T> stream) {
return stream.collect(
collectingAndThen(
toList(), l -> {
Collections.reverse(l);
return l;
}))
.stream();
}
public static <T, E extends RuntimeException> BinaryOperator<T> ensureSingle() {
return (element, otherElement) -> {
throw new IllegalArgumentException();
};
}
}