UniqueRandomGenerator


1   package org.jgap.util;
2   
3   import org.jgap.*;
4   import java.util.*;
5   
6   public class UniqueRandomGenerator {
7     private int m_upper;
8   
9     private List m_resultSet;
10  
11    private RandomGenerator m_generator;
12  
13    public UniqueRandomGenerator(int a_upperBoundary, RandomGenerator a_generator) {
14      m_upper = a_upperBoundary;
15      m_resultSet = new Vector();
16      m_generator = a_generator;
17      for (int i = 0; i < m_upper; i++) {
18        m_resultSet.add(new Integer  (i));
19      }
20    }
21  
22    public int nextInt()
23        throws IllegalStateException   {
24      int size = m_resultSet.size();
25      if (size < 1) {
26        throw new IllegalStateException  ("No more numbers left");
27      }
28      int index = m_generator.nextInt(size);
29      Integer   result = (Integer  ) m_resultSet.get(index);
30      m_resultSet.remove(index);
31      return result.intValue();
32    }
33  }
34

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