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
This commit is contained in:
mcilwain 2017-10-11 13:09:26 -07:00 committed by jianglai
parent 184b2b56ac
commit c0f8da0c6e
581 changed files with 1325 additions and 932 deletions

View file

@ -27,9 +27,9 @@ import com.google.appengine.api.urlfetch.HTTPHeader;
import com.google.appengine.api.urlfetch.HTTPRequest;
import com.google.appengine.api.urlfetch.HTTPResponse;
import com.google.common.base.Ascii;
import com.google.common.base.Optional;
import com.google.common.base.Strings;
import com.google.common.net.MediaType;
import java.util.Optional;
import java.util.Random;
/** Helper methods for the App Engine URL fetch service. */
@ -55,7 +55,7 @@ public final class UrlFetchUtils {
return Optional.of(header.getValue());
}
}
return Optional.absent();
return Optional.empty();
}
/**