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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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@@ -21,7 +21,6 @@ import static com.google.common.collect.ImmutableSet.toImmutableSet;
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import com.google.common.base.Function;
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import com.google.common.base.Functions;
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import com.google.common.base.Joiner;
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import com.google.common.base.Optional;
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import com.google.common.base.Splitter;
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import com.google.common.base.Strings;
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import com.google.common.collect.ImmutableBiMap;
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@@ -41,6 +40,7 @@ import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.Set;
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import java.util.stream.Stream;
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import javax.inject.Inject;
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