Transformer implementation that returns the same constant each time. No check is made that the object is immutable. In general, only immutable objects should use the constant factory. Mutable objects should use the prototype factory.
@author Matt Hall, John Watkinson, Stephen Colebourne
@version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $
@since Commons Collections 3.0
Purpose: Allows a field to always be mapped to a constant value. This allows default values to be provided for un-mapped fields.
@see org.eclipse.persistence.mappings.FieldTransformer
@author James Sutherland
@since 10.1.3
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