content: 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.
   * 
   */
  
  
  import org.apache.commons.math3.distribution.AbstractRealDistribution;
  
  public class DistributionOffsetApache extends Distribution
  {
  
      final AbstractRealDistribution delegate;
      final long min, delta;
  
      public DistributionOffsetApache(AbstractRealDistribution delegate, long min, long max)
      {
          this.delegate = delegate;
          this.min = min;
          this.delta = max - min;
      }
  
      public void setSeed(long seed)
      {
          delegate.reseedRandomGenerator(seed);
      }
  
      @Override
      public long next()
      {
          return offset(min, delta, delegate.sample());
      }
  
      public double nextDouble()
      {
          return offsetDouble(min, delta, delegate.sample());
      }
  
      @Override
      public long inverseCumProb(double cumProb)
      {
          return offset(min, delta, delegate.inverseCumulativeProbability(cumProb));
      }
  
      private long offset(long min, long delta, double val)
      {
          long r = (long) val;
          if (r < 0)
              r = 0;
          if (r > delta)
              r = delta;
          return min + r;
      }
  
      private double offsetDouble(long min, long delta, double r)
      {
          if (r < 0)
              r = 0;
          if (r > delta)
              r = delta;
          return min + r;
      }
  
  }
  