io.virtdata.random.RandomLineToStringMap 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.distribution.IntegerDistribution;
import org.apache.commons.math3.distribution.UniformIntegerDistribution;
import org.apache.commons.math3.random.MersenneTwister;
import java.util.HashMap;
import java.util.Map;
import java.util.function.LongFunction;
@DeprecatedFunction("random mappers are not deterministic. They will be replaced with hash-based functions.")
public class RandomLineToStringMap implements LongFunction> {
private final RandomLineToString lineDataMapper;
private final IntegerDistribution sizeDistribution;
private final MersenneTwister rng;
public RandomLineToStringMap(String paramFile, int maxSize) {
rng = new MersenneTwister(System.nanoTime());
this.sizeDistribution = new UniformIntegerDistribution(rng, 0,maxSize-1);
this.lineDataMapper = new RandomLineToString(paramFile);
}
public RandomLineToStringMap(String paramFile, int maxSize, long seed) {
this.rng = new MersenneTwister(seed);
this.sizeDistribution = new UniformIntegerDistribution(rng, 0,maxSize-1);
this.lineDataMapper = new RandomLineToString(paramFile);
}
@Override
public Map apply(long input) {
int mapSize = sizeDistribution.sample();
Map map = new HashMap<>();
for (int idx=0;idx