package org.apache.cassandra.stress.generate;
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
public class DistributionInverted extends Distribution
{
final Distribution wrapped;
final long min;
final long max;
public DistributionInverted(Distribution wrapped)
{
this.wrapped = wrapped;
this.min = wrapped.minValue();
this.max = wrapped.maxValue();
}
public long next()
{
return max - (wrapped.next() - min);
}
public double nextDouble()
{
return max - (wrapped.nextDouble() - min);
}
public long inverseCumProb(double cumProb)
{
return max - (wrapped.inverseCumProb(cumProb) - min);
}
public void setSeed(long seed)
{
wrapped.setSeed(seed);
}
public static Distribution invert(Distribution distribution)
{
if (distribution instanceof DistributionInverted)
return ((DistributionInverted) distribution).wrapped;
return new DistributionInverted(distribution);
}
}