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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4148) _TestUtil should be able to generate random longs
Date Fri, 15 Jun 2012 15:04:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295713#comment-13295713
] 

Dawid Weiss commented on LUCENE-4148:
-------------------------------------

Try RandomInts from randomizedtesting, it does what you need:
{code}
  /** 
   * A random integer from <code>min</code> to <code>max</code> (inclusive).
   */
  public static int     randomIntBetween(Random r, int min, int max) {
    assert max >= min : "max must be >= min: " + min + ", " + max;
    long range = (long) max - (long) min;
    if (range < Integer.MAX_VALUE) {
      return min + r.nextInt(1 + (int) range);
    } else {
      return min + (int) Math.round(r.nextDouble() * range);
    }
  } 
{code}
                
> _TestUtil should be able to generate random longs
> -------------------------------------------------
>
>                 Key: LUCENE-4148
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4148
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: general/test
>            Reporter: Adrien Grand
>            Priority: Trivial
>
> It would be helpful in TestPackedInts at least, in order to generate random values (as
a workaround, we currently generate a random int between 0 and {{min(Integer.MAX_VALUE, PackedInts.maxValue(bitsPerValue)}}).
Moreover, it would help to fix {{nextInt}} for large ranges (calling {{nextInt(random, -10,
Integer.MAX_VALUE)}} or even {{nextInt(random, 0, Integer.MAX_VALUE)}} currently fails because
the range of values is {{> Integer.MAX_VALUE}}.

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