| /* |
| * Copyright (c) 2013, 2018, 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. |
| * |
| * 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 vm.share; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Random; |
| import java.util.function.Predicate; |
| import java.util.function.Supplier; |
| |
| public class RandomEx extends Random { |
| private final Map<Class<?>, Supplier<?>> map = new HashMap<>(); |
| |
| { |
| map.put(Boolean.class, this::nextBoolean); |
| map.put(boolean.class, this::nextBoolean); |
| map.put(Byte.class, this::nextByte); |
| map.put(byte.class, this::nextByte); |
| map.put(Short.class, this::nextShort); |
| map.put(short.class, this::nextShort); |
| map.put(Character.class, this::nextChar); |
| map.put(char.class, this::nextChar); |
| map.put(Integer.class, this::nextInt); |
| map.put(int.class, this::nextInt); |
| map.put(Long.class, this::nextLong); |
| map.put(long.class, this::nextLong); |
| map.put(Float.class, this::nextFloat); |
| map.put(float.class, this::nextFloat); |
| map.put(Double.class, this::nextDouble); |
| map.put(double.class, this::nextDouble); |
| } |
| |
| public RandomEx() { |
| } |
| |
| public RandomEx(long seed) { |
| super(seed); |
| } |
| |
| public byte nextByte() { |
| return (byte) next(Byte.SIZE); |
| } |
| |
| public short nextShort() { |
| return (short) next(Short.SIZE); |
| } |
| |
| public char nextChar() { |
| return (char) next(Character.SIZE); |
| } |
| |
| public <T> T next(Predicate<T> p, T dummy) { |
| T result; |
| do { |
| result = next(dummy); |
| } while (!p.test(result)); |
| return result; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public <T> T next(T dummy) { |
| Supplier<?> supplier = map.get(dummy.getClass()); |
| if (supplier == null) { |
| throw new IllegalArgumentException("supplier for <" + |
| dummy.getClass() + ">is not found"); |
| } |
| return (T) supplier.get(); |
| } |
| } |