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From "Klaus Hartlage (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-284) Avoid ArrayStoreException
Date Sun, 16 Aug 2009 19:59:14 GMT
Avoid ArrayStoreException
-------------------------

                 Key: MATH-284
                 URL: https://issues.apache.org/jira/browse/MATH-284
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 2.0
            Reporter: Klaus Hartlage
            Priority: Minor


Add a new method
org.apache.commons.math,Field#getRuntimeClass():
...
    /**
     * Returns the runtime class of the FieldElement. 
     * 
     * @return The {@code Class} object that represents the runtime
     *         class of this object.
     */
    Class<? extends FieldElement> getRuntimeClass();
...

and replace all occurrences of 
  Array.newInstance(field.getZero().getClass(),....)
with
  Array.newInstance(field.getRuntimeClass(),....)

to avoid the throwing of ArrayStoreException in the case you have a type hierachy of Fields
with a common interface
and the array should have the interface type at runtime.





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