RandomVariateGenInt.java

/*
 * Class:        RandomVariateGenInt
 * Description:  base class for all generators of discrete random variates
over the integers
 * Environment:  Java
 * Software:     SSJ
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author
 * @since
 *
 *
 * 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 umontreal.ssj.randvar;
 
import umontreal.ssj.rng.RandomStream;
import umontreal.ssj.probdist.DiscreteDistributionInt;

public class RandomVariateGenInt extends RandomVariateGen {
 
   protected RandomVariateGenInt() {
   }

   public RandomVariateGenInt(RandomStream s, DiscreteDistributionInt dist) {
      this.stream = s;
      this.dist = dist;
   }

   public int nextInt() {
      return ((DiscreteDistributionInt) dist).inverseFInt(stream.nextDouble());
   }

   public void nextArrayOfInt(int[] v, int start, int n) {
      if (n < 0)
         throw new IllegalArgumentException("n must be positive.");
      for (int i = 0; i < n; i++)
         v[start + i] = nextInt();
   }

   public int[] nextArrayOfInt(int n) {
      if (n <= 0)
         throw new IllegalArgumentException("n must be positive.");
      int[] v = new int[n];
      for (int i = 0; i < n; i++)
         v[i] = nextInt();
      return v;
   }

   public DiscreteDistributionInt getDistribution() {
      return (DiscreteDistributionInt) dist;
   }
 
}