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From "Piotr Wydrych (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-942) DiscreteDistribution.sample(int) may throw an exception if first element of singletons of sub-class type
Date Sat, 09 Mar 2013 22:19:12 GMT

     [ https://issues.apache.org/jira/browse/MATH-942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Piotr Wydrych updated MATH-942:
-------------------------------

    Attachment:     (was: DiscreteDistribution.java.patch)
    
> DiscreteDistribution.sample(int) may throw an exception if first element of singletons
of sub-class type
> --------------------------------------------------------------------------------------------------------
>
>                 Key: MATH-942
>                 URL: https://issues.apache.org/jira/browse/MATH-942
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Piotr Wydrych
>         Attachments: DiscreteDistribution.java.patch
>
>
> Creating an array with {{Array.newInstance(singletons.get(0).getClass(), sampleSize)}}
in DiscreteDistribution.sample(int) is risky. An exception will be thrown if:
> * {{singleons.get(0)}} is of type T1, an sub-class of T, and
> * {{DiscreteDistribution.sample()}} returns an object which is of type T, but not of
type T1.
> To reproduce:
> {code}
> List<Pair<Object,Double>> list = new ArrayList<Pair<Object, Double>>();
> list.add(new Pair<Object, Double>(new Object() {}, new Double(0)));
> list.add(new Pair<Object, Double>(new Object() {}, new Double(1)));
> new DiscreteDistribution<Object>(list).sample(1);
> {code}
> Attaching a patch.

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