mirror of
https://github.com/google/nomulus
synced 2026-05-31 20:16:31 +00:00
44 lines
1.6 KiB
Java
44 lines
1.6 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.domain.registry.model.domain;
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import static com.google.common.base.Preconditions.checkArgument;
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import com.google.common.base.Strings;
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import com.google.common.net.InternetDomainName;
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/**
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* Contains static utility methods for dealing with domains.
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*/
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public class DomainUtils {
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/**
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* Returns the canonicalized TLD part of a valid domain name (just an SLD, no subdomains) by
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* stripping off the leftmost part.
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*
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* <p>This function is compatible with multi-part tlds.
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*
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* @throws IllegalArgumentException if there is no TLD
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*/
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public static String getTldFromDomainName(String fullyQualifiedDomainName) {
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checkArgument(
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!Strings.isNullOrEmpty(fullyQualifiedDomainName),
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"fullyQualifiedDomainName cannot be null or empty");
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InternetDomainName domainName = InternetDomainName.from(fullyQualifiedDomainName);
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checkArgument(domainName.hasParent(), "fullyQualifiedDomainName does not have a TLD");
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return domainName.parent().toString();
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}
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}
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