90 lines
2.9 KiB
Java
90 lines
2.9 KiB
Java
/*
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* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package vm.share;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Random;
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import java.util.function.Predicate;
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import java.util.function.Supplier;
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public class RandomEx extends Random {
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private final Map<Class<?>, Supplier<?>> map = new HashMap<>();
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{
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map.put(Boolean.class, this::nextBoolean);
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map.put(boolean.class, this::nextBoolean);
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map.put(Byte.class, this::nextByte);
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map.put(byte.class, this::nextByte);
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map.put(Short.class, this::nextShort);
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map.put(short.class, this::nextShort);
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map.put(Character.class, this::nextChar);
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map.put(char.class, this::nextChar);
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map.put(Integer.class, this::nextInt);
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map.put(int.class, this::nextInt);
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map.put(Long.class, this::nextLong);
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map.put(long.class, this::nextLong);
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map.put(Float.class, this::nextFloat);
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map.put(float.class, this::nextFloat);
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map.put(Double.class, this::nextDouble);
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map.put(double.class, this::nextDouble);
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}
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public RandomEx() {
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}
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public RandomEx(long seed) {
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super(seed);
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}
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public byte nextByte() {
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return (byte) next(Byte.SIZE);
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}
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public short nextShort() {
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return (short) next(Short.SIZE);
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}
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public char nextChar() {
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return (char) next(Character.SIZE);
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}
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public <T> T next(Predicate<T> p, T dummy) {
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T result;
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do {
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result = next(dummy);
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} while (!p.test(result));
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return result;
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}
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@SuppressWarnings("unchecked")
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public <T> T next(T dummy) {
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Supplier<?> supplier = map.get(dummy.getClass());
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if (supplier == null) {
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throw new IllegalArgumentException("supplier for <" +
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dummy.getClass() + ">is not found");
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}
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return (T) supplier.get();
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}
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}
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