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UniformGenerator.java
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Mon, Aug 19, 13:08

UniformGenerator.java
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/**
* Copyright (c) 2010 Yahoo! Inc. Copyright (c) 2017 YCSB contributors. All rights reserved.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.generator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* An expression that generates a random value in the specified range.
*/
public class UniformGenerator extends Generator<String> {
private final List<String> values;
private String laststring;
private final UniformLongGenerator gen;
/**
* Creates a generator that will return strings from the specified set uniformly randomly.
*/
public UniformGenerator(Collection<String> values) {
this.values = new ArrayList<>(values);
laststring = null;
gen = new UniformLongGenerator(0, values.size() - 1);
}
/**
* Generate the next string in the distribution.
*/
@Override
public String nextValue() {
laststring = values.get(gen.nextValue().intValue());
return laststring;
}
/**
* Return the previous string generated by the distribution; e.g., returned from the last nextString() call.
* Calling lastString() should not advance the distribution or have any side effects. If nextString() has not yet
* been called, lastString() should return something reasonable.
*/
@Override
public String lastValue() {
if (laststring == null) {
nextValue();
}
return laststring;
}
}

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