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

java/google/registry/rdap/RdapActionBase.java

@@ -26,7 +26,6 @@ import static javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST;
 import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
 import static javax.servlet.http.HttpServletResponse.SC_OK;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.net.InternetDomainName;
 import com.google.common.net.MediaType;
@@ -54,6 +53,7 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 import javax.servlet.http.HttpServletRequest;
@@ -196,7 +196,7 @@ public abstract class RdapActionBase implements Runnable {
    */
   boolean shouldIncludeDeleted() {
     // If includeDeleted is not specified, or set to false, we don't need to go any further.
-    if (!includeDeletedParam.or(false)) {
+    if (!includeDeletedParam.orElse(false)) {
       return false;
     }
     if (!authResult.userAuthInfo().isPresent()) {

java/google/registry/rdap/RdapDomainSearchAction.java

@@ -21,7 +21,6 @@ import static google.registry.request.Action.Method.GET;
 import static google.registry.request.Action.Method.HEAD;
 import static google.registry.util.DateTimeUtils.END_OF_TIME;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSortedSet;
@@ -48,6 +47,7 @@ import java.net.InetAddress;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Optional;
 import javax.inject.Inject;
 import org.joda.time.DateTime;
 

java/google/registry/rdap/RdapEntityAction.java

@@ -19,7 +19,6 @@ import static google.registry.rdap.RdapUtils.getRegistrarByIanaIdentifier;
 import static google.registry.request.Action.Method.GET;
 import static google.registry.request.Action.Method.HEAD;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.primitives.Longs;
 import com.google.re2j.Pattern;
@@ -33,6 +32,7 @@ import google.registry.request.HttpException.BadRequestException;
 import google.registry.request.HttpException.NotFoundException;
 import google.registry.request.auth.Auth;
 import google.registry.util.Clock;
+import java.util.Optional;
 import javax.inject.Inject;
 import org.joda.time.DateTime;
 
@@ -89,7 +89,7 @@ public class RdapEntityAction extends RdapActionBase {
         return rdapJsonFormatter.makeRdapJsonForContact(
             contactResource,
             true,
-            Optional.<DesignatedContact.Type>absent(),
+            Optional.<DesignatedContact.Type>empty(),
             rdapLinkBase,
             rdapWhoisServer,
             now,

java/google/registry/rdap/RdapEntitySearchAction.java

@@ -20,7 +20,6 @@ import static google.registry.rdap.RdapUtils.getRegistrarByIanaIdentifier;
 import static google.registry.request.Action.Method.GET;
 import static google.registry.request.Action.Method.HEAD;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Streams;
@@ -42,6 +41,7 @@ import google.registry.request.auth.Auth;
 import google.registry.util.Clock;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import javax.inject.Inject;
 import org.joda.time.DateTime;
 
@@ -298,7 +298,7 @@ public class RdapEntitySearchAction extends RdapActionBase {
       jsonOutputList.add(rdapJsonFormatter.makeRdapJsonForContact(
           contact,
           false,
-          Optional.<DesignatedContact.Type>absent(),
+          Optional.<DesignatedContact.Type>empty(),
           rdapLinkBase,
           rdapWhoisServer,
           now,

java/google/registry/rdap/RdapJsonFormatter.java

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

java/google/registry/rdap/RdapModule.java

@@ -14,12 +14,12 @@
 
 package google.registry.rdap;
 
-import com.google.common.base.Optional;
 import dagger.Module;
 import dagger.Provides;
 import google.registry.request.Parameter;
 import google.registry.request.RequestParameters;
 import java.net.InetAddress;
+import java.util.Optional;
 import javax.servlet.http.HttpServletRequest;
 
 /** Dagger module for the RDAP package. */

java/google/registry/rdap/RdapNameserverSearchAction.java

@@ -18,7 +18,6 @@ import static google.registry.model.EppResourceUtils.loadByForeignKey;
 import static google.registry.request.Action.Method.GET;
 import static google.registry.request.Action.Method.HEAD;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSortedSet;
@@ -41,6 +40,7 @@ import google.registry.util.Idn;
 import java.net.InetAddress;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import javax.inject.Inject;
 import org.joda.time.DateTime;
 

java/google/registry/rdap/RdapUtils.java

@@ -14,10 +14,10 @@
 
 package google.registry.rdap;
 
-import static com.google.common.collect.Iterables.tryFind;
-
-import com.google.common.base.Optional;
+import com.google.common.collect.Streams;
 import google.registry.model.registrar.Registrar;
+import java.util.Objects;
+import java.util.Optional;
 
 /** Utility functions for RDAP. */
 public final class RdapUtils {
@@ -26,11 +26,8 @@ public final class RdapUtils {
 
   /** Looks up a registrar by its IANA identifier. */
   static Optional<Registrar> getRegistrarByIanaIdentifier(final long ianaIdentifier) {
-    return tryFind(
-        Registrar.loadAllCached(),
-        registrar -> {
-          Long registrarIanaIdentifier = registrar.getIanaIdentifier();
-          return (registrarIanaIdentifier != null) && (registrarIanaIdentifier == ianaIdentifier);
-        });
+    return Streams.stream(Registrar.loadAllCached())
+        .filter(registrar -> Objects.equals(ianaIdentifier, registrar.getIanaIdentifier()))
+        .findFirst();
   }
 }