adds digest cache for symbols, booleans, and nulls

amazon-ion / ion-hash-java

A Java implementation of Amazon Ion Hash.

https://amazon-ion.github.io/ion-hash/

Apache License 2.0

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Closed pbcornell closed 7 years ago

pbcornell commented 7 years ago

Includes the following changes:

caches digests of symbols (including fieldNames and annotation symbols), booleans, and nulls
simplifies ScalarHasher api to provide digest() methods (instead of update() then digest())
avoids creation of new byte[] for each symbol TQ byte
bug fix: duplicate fields in a struct were being collapsed into single fields while computing hash