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Switch from Guava Optionals to Java 8 Optionals
This was a surprisingly involved change. Some of the difficulties included java.util.Optional purposely not being Serializable (so I had to move a few Optionals in mapreduce classes to @Nullable) and having to add the Truth Java8 extension library for assertion support. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=171863777
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@@ -18,11 +18,11 @@ import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.base.Preconditions.checkState;
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import static google.registry.model.ofy.ObjectifyService.ofy;
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import com.google.common.base.Optional;
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import com.google.common.collect.ImmutableList;
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import com.google.common.net.InetAddresses;
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import google.registry.model.host.HostResource;
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import google.registry.model.registrar.Registrar;
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import java.util.Optional;
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import org.joda.time.DateTime;
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/** Container for WHOIS responses to a nameserver lookup queries. */
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