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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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@@ -22,7 +22,6 @@ import static google.registry.util.CollectionUtils.union;
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import static google.registry.util.DomainNameUtils.ACE_PREFIX;
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import com.google.common.base.Functions;
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import com.google.common.base.Optional;
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import com.google.common.base.Predicates;
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import com.google.common.collect.FluentIterable;
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import com.google.common.collect.ImmutableList;
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@@ -60,6 +59,7 @@ import java.net.URI;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.Optional;
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import javax.annotation.Nullable;
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import javax.inject.Inject;
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import javax.inject.Singleton;
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