Merge DomainResource into DomainBase

This eliminates the use of Objectify polymorphism for EPP resources entirely
(yay!), which makes the Registry 3.0 database migration easier.

It is unfortunate that the naming parallelism of EppResources is lost between
ContactResource, HostResource, and DomainResource, but the actual type as far as
Datastore was concerned was DomainBase all along, and it would be a much more
substantial data migration to allow us to continue using the class name
DomainResource now that we're no longer using Objectify polymorphism. This
simply isn't worth it.

This also removes the polymorphic Datastore indexes (which will no longer
function as of this change). The non-polymorphic replacement indexes were added
in []

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=230930546

java/google/registry/dns/RefreshDnsAction.java

@@ -20,7 +20,7 @@ import google.registry.dns.DnsConstants.TargetType;
 import google.registry.model.EppResource;
 import google.registry.model.EppResource.ForeignKeyedEppResource;
 import google.registry.model.annotations.ExternalMessagingName;
-import google.registry.model.domain.DomainResource;
+import google.registry.model.domain.DomainBase;
 import google.registry.model.host.HostResource;
 import google.registry.request.Action;
 import google.registry.request.HttpException.BadRequestException;
@@ -51,7 +51,7 @@ public final class RefreshDnsAction implements Runnable {
     }
     switch (type) {
       case DOMAIN:
-        loadAndVerifyExistence(DomainResource.class, domainOrHostName);
+        loadAndVerifyExistence(DomainBase.class, domainOrHostName);
         dnsQueue.addDomainRefreshTask(domainOrHostName);
         break;
       case HOST:

java/google/registry/dns/writer/clouddns/CloudDnsWriter.java

@@ -36,7 +36,7 @@ import google.registry.config.RegistryConfig.Config;
 import google.registry.dns.writer.BaseDnsWriter;
 import google.registry.dns.writer.DnsWriter;
 import google.registry.dns.writer.DnsWriterZone;
-import google.registry.model.domain.DomainResource;
+import google.registry.model.domain.DomainBase;
 import google.registry.model.domain.secdns.DelegationSignerData;
 import google.registry.model.host.HostResource;
 import google.registry.model.registry.Registries;
@@ -121,13 +121,13 @@ public class CloudDnsWriter extends BaseDnsWriter {
     String absoluteDomainName = getAbsoluteHostName(domainName);
 
     // Load the target domain. Note that it can be absent if this domain was just deleted.
-    Optional<DomainResource> domainResource =
-        loadByForeignKey(DomainResource.class, domainName, clock.nowUtc());
+    Optional<DomainBase> domainBase =
+        loadByForeignKey(DomainBase.class, domainName, clock.nowUtc());
 
     // Return early if no DNS records should be published.
     // desiredRecordsBuilder is populated with an empty set to indicate that all existing records
     // should be deleted.
-    if (!domainResource.isPresent() || !domainResource.get().shouldPublishToDns()) {
+    if (!domainBase.isPresent() || !domainBase.get().shouldPublishToDns()) {
       desiredRecords.put(absoluteDomainName, ImmutableSet.of());
       return;
     }
@@ -135,7 +135,7 @@ public class CloudDnsWriter extends BaseDnsWriter {
     ImmutableSet.Builder<ResourceRecordSet> domainRecords = new ImmutableSet.Builder<>();
 
     // Construct DS records (if any).
-    Set<DelegationSignerData> dsData = domainResource.get().getDsData();
+    Set<DelegationSignerData> dsData = domainBase.get().getDsData();
     if (!dsData.isEmpty()) {
       HashSet<String> dsRrData = new HashSet<>();
       for (DelegationSignerData ds : dsData) {
@@ -154,8 +154,8 @@ public class CloudDnsWriter extends BaseDnsWriter {
     }
 
     // Construct NS records (if any).
-    Set<String> nameserverData = domainResource.get().loadNameserverFullyQualifiedHostNames();
-    Set<String> subordinateHosts = domainResource.get().getSubordinateHosts();
+    Set<String> nameserverData = domainBase.get().loadNameserverFullyQualifiedHostNames();
+    Set<String> subordinateHosts = domainBase.get().getSubordinateHosts();
     if (!nameserverData.isEmpty()) {
       HashSet<String> nsRrData = new HashSet<>();
       for (String hostName : nameserverData) {

java/google/registry/dns/writer/dnsupdate/DnsUpdateWriter.java

@@ -27,7 +27,7 @@ import com.google.common.net.InternetDomainName;
 import google.registry.config.RegistryConfig.Config;
 import google.registry.dns.writer.BaseDnsWriter;
 import google.registry.dns.writer.DnsWriterZone;
-import google.registry.model.domain.DomainResource;
+import google.registry.model.domain.DomainBase;
 import google.registry.model.domain.secdns.DelegationSignerData;
 import google.registry.model.host.HostResource;
 import google.registry.model.registry.Registries;
@@ -127,12 +127,12 @@ public class DnsUpdateWriter extends BaseDnsWriter {
    *     this domain refresh request
    */
   private void publishDomain(String domainName, String requestingHostName) {
-    Optional<DomainResource> domainOptional =
-        loadByForeignKey(DomainResource.class, domainName, clock.nowUtc());
+    Optional<DomainBase> domainOptional =
+        loadByForeignKey(DomainBase.class, domainName, clock.nowUtc());
     update.delete(toAbsoluteName(domainName), Type.ANY);
     // If the domain is now deleted, then don't update DNS for it.
     if (domainOptional.isPresent()) {
-      DomainResource domain = domainOptional.get();
+      DomainBase domain = domainOptional.get();
       // As long as the domain exists, orphan glues should be cleaned.
       deleteSubordinateHostAddressSet(domain, requestingHostName, update);
       if (domain.shouldPublishToDns()) {
@@ -184,7 +184,7 @@ public class DnsUpdateWriter extends BaseDnsWriter {
     }
   }
 
-  private RRset makeDelegationSignerSet(DomainResource domain) {
+  private RRset makeDelegationSignerSet(DomainBase domain) {
     RRset signerSet = new RRset();
     for (DelegationSignerData signerData : domain.getDsData()) {
       DSRecord dsRecord =
@@ -202,7 +202,7 @@ public class DnsUpdateWriter extends BaseDnsWriter {
   }
 
   private void deleteSubordinateHostAddressSet(
-      DomainResource domain, String additionalHost, Update update) {
+      DomainBase domain, String additionalHost, Update update) {
     for (String hostName :
         union(
             domain.getSubordinateHosts(),
@@ -213,7 +213,7 @@ public class DnsUpdateWriter extends BaseDnsWriter {
     }
   }
 
-  private void addInBailiwickNameServerSet(DomainResource domain, Update update) {
+  private void addInBailiwickNameServerSet(DomainBase domain, Update update) {
     for (String hostName :
         intersection(
             domain.loadNameserverFullyQualifiedHostNames(), domain.getSubordinateHosts())) {
@@ -224,7 +224,7 @@ public class DnsUpdateWriter extends BaseDnsWriter {
     }
   }
 
-  private RRset makeNameServerSet(DomainResource domain) {
+  private RRset makeNameServerSet(DomainBase domain) {
     RRset nameServerSet = new RRset();
     for (String hostName : domain.loadNameserverFullyQualifiedHostNames()) {
       NSRecord record =