RandomNumberSupplier.java

/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.aggregation;

import java.util.Random;

abstract class RandomNumberSupplier<T extends Number> {

    private static final Random RANDOM = new Random();

    T get() {
        Double randomValue = randomInt(1, 1000) * randomDouble();
        return mapFrom(randomValue);
    }

    private double randomDouble() {
        return RANDOM.nextDouble() + 0.01;
    }

    private int randomInt(int from, int to) {
        return from + RANDOM.nextInt(to);
    }

    protected abstract T mapFrom(Number value);
}