io.virtdata.random.RandomToByteBuffer Maven / Gradle / Ivy
/*
*
* Copyright 2015 Jonathan Shook
*
* 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.virtdata.random;
import io.virtdata.annotations.DeprecatedFunction;
import org.apache.commons.math3.random.MersenneTwister;
import java.nio.ByteBuffer;
import java.util.function.LongFunction;
@DeprecatedFunction("random mappers are not deterministic. They will be replaced with hash-based functions.")
public class RandomToByteBuffer implements LongFunction {
private final MersenneTwister rng;
private int length;
public RandomToByteBuffer(int length) {
this.length = length;
rng = new MersenneTwister(System.nanoTime());
}
public RandomToByteBuffer(int length, long seed) {
this.length = length;
rng = new MersenneTwister(seed);
}
@Override
public ByteBuffer apply(long input) {
byte[] buffer = new byte[length];
rng.nextBytes(buffer);
return ByteBuffer.wrap(buffer);
}
}