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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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@@ -18,7 +18,6 @@ import static com.google.common.base.Preconditions.checkArgument;
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import static com.google.common.base.Throwables.throwIfUnchecked;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.base.Optional;
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import com.google.common.base.Strings;
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import com.google.common.collect.ImmutableSortedSet;
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import com.google.common.util.concurrent.UncheckedExecutionException;
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@@ -27,6 +26,7 @@ import google.registry.util.AppEngineTimeLimiter;
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import google.registry.util.FormattingLogger;
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import google.registry.util.RequestStatusChecker;
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import java.util.HashSet;
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import java.util.Optional;
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import java.util.Set;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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