Move getTldFromDomainName into DomainNameUtils

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=118475557

java/com/google/domain/registry/dns/DnsQueue.java

@@ -19,9 +19,9 @@ import static com.google.common.base.Strings.isNullOrEmpty;
 import static com.google.domain.registry.dns.DnsConstants.DNS_PULL_QUEUE_NAME;
 import static com.google.domain.registry.dns.DnsConstants.DNS_TARGET_NAME_PARAM;
 import static com.google.domain.registry.dns.DnsConstants.DNS_TARGET_TYPE_PARAM;
-import static com.google.domain.registry.model.domain.DomainUtils.getTldFromDomainName;
 import static com.google.domain.registry.model.registry.Registries.assertTldExists;
 import static com.google.domain.registry.request.RequestParameters.PARAM_TLD;
+import static com.google.domain.registry.util.DomainNameUtils.getTldFromDomainName;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 
 import com.google.appengine.api.taskqueue.Queue;

java/com/google/domain/registry/flows/domain/DomainCheckFlow.java

@@ -17,9 +17,9 @@ package com.google.domain.registry.flows.domain;
 import static com.google.domain.registry.flows.domain.DomainFlowUtils.getReservationType;
 import static com.google.domain.registry.flows.domain.DomainFlowUtils.handleFeeRequest;
 import static com.google.domain.registry.model.EppResourceUtils.checkResourcesExist;
-import static com.google.domain.registry.model.domain.DomainUtils.getTldFromDomainName;
 import static com.google.domain.registry.model.registry.label.ReservationType.UNRESERVED;
 import static com.google.domain.registry.util.CollectionUtils.nullToEmpty;
+import static com.google.domain.registry.util.DomainNameUtils.getTldFromDomainName;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.net.InternetDomainName;

java/com/google/domain/registry/model/domain/DomainBase.java

@@ -13,15 +13,16 @@
 // limitations under the License.
 
 package com.google.domain.registry.model.domain;
+
 import static com.google.common.base.Preconditions.checkState;
 import static com.google.common.base.Strings.isNullOrEmpty;
 import static com.google.common.collect.Sets.difference;
 import static com.google.common.collect.Sets.union;
 import static com.google.domain.registry.model.domain.DesignatedContact.Type.REGISTRANT;
-import static com.google.domain.registry.model.domain.DomainUtils.getTldFromDomainName;
 import static com.google.domain.registry.util.CollectionUtils.nullToEmptyImmutableCopy;
 import static com.google.domain.registry.util.CollectionUtils.nullToEmptyImmutableSortedCopy;
 import static com.google.domain.registry.util.CollectionUtils.union;
+import static com.google.domain.registry.util.DomainNameUtils.getTldFromDomainName;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.ImmutableSortedSet;

java/com/google/domain/registry/model/domain/DomainUtils.java

@@ -1,50 +0,0 @@
-// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.domain.registry.model.domain;
-
-import static com.google.common.base.Preconditions.checkArgument;
-
-import com.google.common.base.Strings;
-import com.google.common.net.InternetDomainName;
-
-/**
- * Utility class for dealing with domains.
- */
-public final class DomainUtils {
-
-  /**
-   * Returns the canonicalized TLD part of a valid domain name (just an SLD, no subdomains) by
-   * stripping off the leftmost part.
-   *
-   * <p>This function is compatible with multi-part tlds, e.g. {@code co.uk}. This function will
-   * also work on domains for which the registry is not authoritative. If you are certain that the
-   * input will be under a TLD this registry controls, then it is preferable to use
-   * {@link com.google.domain.registry.model.registry.Registries#findTldForName(InternetDomainName)
-   * Registries#findTldForName}, which will work on hostnames in addition to domains.
-   *
-   * @param fullyQualifiedDomainName must be a punycode SLD (not a host or unicode)
-   * @throws IllegalArgumentException if there is no TLD
-   */
-  public static String getTldFromDomainName(String fullyQualifiedDomainName) {
-    checkArgument(
-        !Strings.isNullOrEmpty(fullyQualifiedDomainName),
-        "fullyQualifiedDomainName cannot be null or empty");
-    InternetDomainName domainName = InternetDomainName.from(fullyQualifiedDomainName);
-    checkArgument(domainName.hasParent(), "fullyQualifiedDomainName does not have a TLD");
-    return domainName.parent().toString();
-  }
-
-  private DomainUtils() {}
-}

java/com/google/domain/registry/model/registry/Registries.java

@@ -91,8 +91,8 @@ public final class Registries {
    *
    * <p><b>Note:</b> This routine will only work on names under TLDs for which this registry is
    * authoritative. To extract TLDs from domains (not hosts) that other registries control, use
-   * {@link com.google.domain.registry.model.domain.DomainUtils#getTldFromDomainName(String)
-   * DomainUtils#getTldFromDomainName}.
+   * {@link com.google.domain.registry.util.DomainNameUtils#getTldFromDomainName(String)
+   * DomainNameUtils#getTldFromDomainName}.
    *
    * @param domainName domain name or host name (but not TLD) under an authoritative TLD
    * @return TLD or absent if {@code domainName} has no labels under an authoritative TLD

java/com/google/domain/registry/ui/server/api/CheckApiServlet.java

@@ -17,10 +17,10 @@ package com.google.domain.registry.ui.server.api;
 import static com.google.common.base.MoreObjects.firstNonNull;
 import static com.google.common.base.Strings.nullToEmpty;
 import static com.google.common.net.HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN;
-import static com.google.domain.registry.model.domain.DomainUtils.getTldFromDomainName;
 import static com.google.domain.registry.model.eppcommon.ProtocolDefinition.ServiceExtension.FEE_0_6;
 import static com.google.domain.registry.ui.server.SoyTemplateUtils.createTofuSupplier;
 import static com.google.domain.registry.util.DomainNameUtils.canonicalizeDomainName;
+import static com.google.domain.registry.util.DomainNameUtils.getTldFromDomainName;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.json.simple.JSONValue.toJSONString;
 

java/com/google/domain/registry/util/DomainNameUtils.java

@@ -14,7 +14,10 @@
 
 package com.google.domain.registry.util;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 import com.google.common.base.Ascii;
+import com.google.common.base.Strings;
 import com.google.common.net.InternetDomainName;
 
 /** Utility methods related to domain names. */
@@ -38,5 +41,27 @@ public final class DomainNameUtils {
     return Idn.toASCII(Ascii.toLowerCase(label));
   }
 
+  /**
+   * Returns the canonicalized TLD part of a valid domain name (just an SLD, no subdomains) by
+   * stripping off the leftmost part.
+   *
+   * <p>This function is compatible with multi-part tlds, e.g. {@code co.uk}. This function will
+   * also work on domains for which the registry is not authoritative. If you are certain that the
+   * input will be under a TLD this registry controls, then it is preferable to use
+   * {@link com.google.domain.registry.model.registry.Registries#findTldForName(InternetDomainName)
+   * Registries#findTldForName}, which will work on hostnames in addition to domains.
+   *
+   * @param fullyQualifiedDomainName must be a punycode SLD (not a host or unicode)
+   * @throws IllegalArgumentException if there is no TLD
+   */
+  public static String getTldFromDomainName(String fullyQualifiedDomainName) {
+    checkArgument(
+        !Strings.isNullOrEmpty(fullyQualifiedDomainName),
+        "fullyQualifiedDomainName cannot be null or empty");
+    InternetDomainName domainName = InternetDomainName.from(fullyQualifiedDomainName);
+    checkArgument(domainName.hasParent(), "fullyQualifiedDomainName does not have a TLD");
+    return domainName.parent().toString();
+  }
+
   private DomainNameUtils() {}
 }