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UniformGenerator.java
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Wed, May 15, 22:31

UniformGenerator.java
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/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* 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. 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 UniformIntegerGenerator _gen;
/**
* Creates a generator that will return strings from the specified set uniformly randomly
*/
public UniformGenerator(Collection<String> values)
{
_values= new ArrayList<>(values);
_laststring=null;
_gen=new UniformIntegerGenerator(0,values.size()-1);
}
/**
* Generate the next string in the distribution.
*/
@Override
public String nextValue()
{
_laststring = _values.get(_gen.nextValue());
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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