io.trino.benchto.driver.utils.PermutationUtils Maven / Gradle / Ivy

Go to download
/*
 * 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 io.trino.benchto.driver.utils;

import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.stream.IntStream;

import static java.util.stream.Collectors.toList;

public class PermutationUtils
{
    public static int[] preparePermutation(int size, int permutationId)
    {
        List intList = IntStream
                .range(0, size)
                .boxed()
                .collect(toList());
        Collections.shuffle(intList, new Random(permutationId * 7823L));
        return intList.stream().mapToInt(i -> i).toArray();
    }

    private PermutationUtils()
    {
    }
}