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/*
* 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();
}
}
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