D- domain type.
R- range type.
public interface Mapping<D,R>
A mapping is very much like a
Map, but the perspective is a
different one: Whereas a map is a (particularly finite) key/value collection, a
mapping is more like a function: it does not support retrieval of all keys or values,
because it does not requires them to be stored at all. Instead, they can be calculated
on the fly upon an invocation of
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