io.virtdata.random.RandomLinesToKeyValueString 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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.function.LongFunction;
import java.util.stream.Collectors;
@DeprecatedFunction("random mappers are not deterministic. They will be replaced with hash-based functions.")
public class RandomLinesToKeyValueString implements LongFunction {
private static final Logger logger = LoggerFactory.getLogger(RandomLinesToKeyValueString.class);
private final RandomLineToStringMap lineDataMapper;
private final MersenneTwister rng;
public RandomLinesToKeyValueString(String paramFile, int maxSize) {
this(paramFile,maxSize,System.nanoTime());
}
public RandomLinesToKeyValueString(String paramFile, int maxsize, long seed) {
rng = new MersenneTwister(seed);
lineDataMapper = new RandomLineToStringMap(paramFile, maxsize);
}
@Override
public String apply(long input) {
Map stringStringMap = lineDataMapper.apply(input);
String mapstring = stringStringMap.entrySet().stream().
map(es -> es.getKey() + ":" + es.getValue() + ";")
.collect(Collectors.joining());
return mapstring;
}
}