--- a/src/java.base/share/classes/java/util/random/SplittableRNG.java Fri Jul 26 15:20:31 2019 -0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,198 +0,0 @@
-/*
- * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package java.util.random;
-
-import java.util.stream.Stream;
-import java.util.stream.StreamSupport;
-import java.util.stream.IntStream;
-import java.util.stream.LongStream;
-import java.util.stream.DoubleStream;
-
-/**
- * This interface is designed to provide a common protocol for objects
- * that generate sequences of pseudorandom numbers (or Boolean values)
- * and furthermore can be <i>split</i> into two objects (the original
- * one and a new one) each of which obey that same protocol (and therefore
- * can be recursively split indefinitely).
- * <p>
- * Ideally, all {@link SplittableRNG} objects produced by recursive
- * splitting from a single original {@link SplittableRNG} object are
- * statistically independent of one another and individually uniform.
- * Therefore we would expect the set of values collectively generated
- * by a set of such objects to have the same statistical properties as
- * if the same quantity of values were generated by a single thread
- * using a single {@link SplittableRNG} object. In practice, one must
- * settle for some approximation to independence and uniformity.
- * <p>
- * Methods are provided to perform a single splitting operation and
- * also to produce a stream of generators split off from the original
- * (by either iterative or recursive splitting, or a combination).
- * <p>
- * An implementation of the {@link SplittableRNG} interface must provide
- * concrete definitions for the methods {@code nextInt()}, {@code nextLong},
- * {@code period()}, {@code split()}, {@code split(SplittableRNG)},
- * {@code splits()}, {@code splits(long)}, {@code splits(SplittableRNG)},
- * and {@code splits(long, SplittableRNG)}. Perhaps the most convenient
- * way to implement this interface is to extend the abstract class
- * {@link AbstractSplittableRNG}.
- * <p>
- * Objects that implement {@link SplittableRNG} are
- * typically not cryptographically secure. Consider instead using
- * {@link java.security.SecureRandom} to get a cryptographically
- * secure pseudo-random number generator for use by
- * security-sensitive applications.
- *
- * @since 14
- */
-public interface SplittableRNG extends StreamableRNG {
-
- /**
- * Returns a new pseudorandom number generator, split off from
- * this one, that implements the {@link RandomNumberGenerator} and {@link SplittableRNG}
- * interfaces.
- *
- * This pseudorandom number generator may be used as a source of
- * pseudorandom bits used to initialize the state the new one.
- *
- * @return a new object that implements the {@link RandomNumberGenerator} and
- * {@link SplittableRNG} interfaces
- */
- SplittableRNG split();
-
- /**
- * Returns a new pseudorandom number generator, split off from
- * this one, that implements the {@link RandomNumberGenerator} and {@link SplittableRNG}
- * interfaces.
- *
- * @param source a {@link SplittableRNG} instance to be used instead
- * of this one as a source of pseudorandom bits used to
- * initialize the state of the new ones.
- *
- * @return an object that implements the {@link RandomNumberGenerator} and
- * {@link SplittableRNG} interfaces
- */
- SplittableRNG split(SplittableRNG source);
-
- /**
- * Returns an effectively unlimited stream of new pseudorandom
- * number generators, each of which implements the {@link SplittableRNG}
- * interface.
- *
- * This pseudorandom number generator may be used as a source of
- * pseudorandom bits used to initialize the state the new ones.
- *
- * @implNote It is permitted to implement this method in a manner
- * equivalent to {@code splits(Long.MAX_VALUE)}.
- *
- * @return a stream of {@link SplittableRNG} objects
- */
- default Stream<SplittableRNG> splits() {
- return this.splits(this);
- }
-
- /**
- * Returns a stream producing the given {@code streamSize} number of
- * new pseudorandom number generators, each of which implements the
- * {@link SplittableRNG} interface.
- *
- * This pseudorandom number generator may be used as a source of
- * pseudorandom bits used to initialize the state the new ones.
- *
- * @param streamSize the number of values to generate
- *
- * @return a stream of {@link SplittableRNG} objects
- *
- * @throws IllegalArgumentException if {@code streamSize} is
- * less than zero
- */
- Stream<SplittableRNG> splits(long streamSize);
-
- /**
- * Returns an effectively unlimited stream of new pseudorandom
- * number generators, each of which implements the {@link SplittableRNG}
- * interface.
- *
- * @param source a {@link SplittableRNG} instance to be used instead
- * of this one as a source of pseudorandom bits used to
- * initialize the state of the new ones.
- *
- * @return a stream of {@link SplittableRNG} objects
- *
- * @implNote It is permitted to implement this method in a manner
- * equivalent to {@code splits(Long.MAX_VALUE, source)}.
- */
- Stream<SplittableRNG> splits(SplittableRNG source);
-
- /**
- * Returns a stream producing the given {@code streamSize} number of
- * new pseudorandom number generators, each of which implements the
- * {@link SplittableRNG} interface.
- *
- * @param streamSize the number of values to generate
- * @param source a {@link SplittableRNG} instance to be used instead
- * of this one as a source of pseudorandom bits used to
- * initialize the state of the new ones.
- *
- * @return a stream of {@link SplittableRNG} objects
- *
- * @throws IllegalArgumentException if {@code streamSize} is
- * less than zero
- */
- Stream<SplittableRNG> splits(long streamSize, SplittableRNG source);
-
- /**
- * Returns an effectively unlimited stream of new pseudorandom
- * number generators, each of which implements the {@link RandomNumberGenerator}
- * interface. Ideally the generators in the stream will appear
- * to be statistically independent.
- *
- * @return a stream of objects that implement the {@link RandomNumberGenerator} interface
- *
- * @implNote The default implementation calls {@code splits()}.
- */
- default Stream<RandomNumberGenerator> rngs() {
- return this.splits().map(x -> (RandomNumberGenerator)x);
- }
-
- /**
- * Returns a stream producing the given {@code streamSize} number of
- * new pseudorandom number generators, each of which implements the
- * {@link RandomNumberGenerator} interface. Ideally the generators in the stream will
- * appear to be statistically independent.
- *
- * @param streamSize the number of generators to generate
- *
- * @return a stream of objects that implement the {@link RandomNumberGenerator} interface
- *
- * @throws IllegalArgumentException if {@code streamSize} is
- * less than zero
- *
- * @implNote The default implementation calls {@code splits(streamSize)}.
- */
- default Stream<RandomNumberGenerator> rngs(long streamSize) {
- return this.splits(streamSize).map(x -> (RandomNumberGenerator)x);
- }
-}