tree ba1f12cdf2433d7642f82f8f01c4a46033cf559f
parent fc23edc368244849c59636d1e2ae6c375bebf262
author janakr <janakr@google.com> 1528219562 -0700
committer Copybara-Service <copybara-piper@google.com> 1528219689 -0700

Add functionality to SerializationContext and @AutoCodec to check that a class is allowed to be serialized in the current context. A codec can now add an explicitly allowed class that can be serialized underneath it (via SerializationContext#addExplicitlyAllowedClass), and that class's codec can check that it is explicitly allowed (via SerializationContext#checkClassExplicitlyAllowed). It is a runtime crash if a codec checks that it was explicitly allowed and finds that it wasn't. Thus, if PackageCodec is invoked without it having been explicitly allowed, we will crash, preventing Package from sneaking into a value it shouldn't be in.

This is only enabled if the codec is memoizing.

PiperOrigin-RevId: 199317936