D- the descriptor type.
R- the resource type it resolves to.
public interface Function<D,R> extends java.util.function.Function<D,R>
Semantically, this could be a Factory, Generator, Builder, Closure,
Transformer, Resolver or something else entirely. No particular guarantees
are implied by this interface apart from idempotence (see below).
Specifically, implementations may or may not return or accept null and can
optionally block until elements are available or throw
runtime exceptions if the input is not acceptable
for some reason. Any clients that require a firmer contract should subclass
this interface and document their requirements.
It is expected that for any two calls to
apply(Object) D the returned
resource will be semantically the same, ie. that the call is effectively
idempotent. Any implementation that violates this should document the fact.
It is not necessary that the resolved object is the same instance or even
As this interface requires idempotence implementations should be reentrant and thread-safe.
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