AbstractHashedMap should not throw exception when initialized to zero size
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Key: COLLECTIONS-392
URL: https://issues.apache.org/jira/browse/COLLECTIONS-392
Project: Commons Collections
Issue Type: Improvement
Components: Map
Reporter: Bernhard Seebass
Priority: Minor
AbstractHashedMap(int initialCapacity, float loadFactor) throws
IllegalArgumentException when initialized to zero initialCapacity. Although
this is the documented behaviour it is quite unexpected as it differs from the
java.util.HashMap implementation and provokes absurd exceptions, e.g. in code
like this:
List results = criteria.list();
Map resultMap = new HashedMap(results.size());
It would be much safer to silently replace a zero initial capacity by initial
capacity 1. Exactly this behaviour is already implemented in
calculateNewCapacity(). Only the validation and the javadoc would have to be
adapted.
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