e8efcd82a8
Motivation: We can just use Objects.requireNonNull(...) as a replacement for ObjectUtil.checkNotNull(....) Modifications: - Use Objects.requireNonNull(...) Result: Less code to maintain.
62 lines
2.4 KiB
Java
62 lines
2.4 KiB
Java
/*
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* Copyright 2018 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver.dns;
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import static java.util.Objects.requireNonNull;
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import java.io.Serializable;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.util.Comparator;
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import java.util.List;
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/**
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* Special {@link Comparator} implementation to sort the nameservers to use when follow redirects.
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*
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* This implementation follows all the semantics listed in the
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* <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html">Comparator apidocs</a>
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* with the limitation that {@link InetSocketAddress#equals(Object)} will not result in the same return value as
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* {@link #compare(InetSocketAddress, InetSocketAddress)}. This is completely fine as this should only be used
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* to sort {@link List}s.
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*/
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public final class NameServerComparator implements Comparator<InetSocketAddress>, Serializable {
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private static final long serialVersionUID = 8372151874317596185L;
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private final Class<? extends InetAddress> preferredAddressType;
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public NameServerComparator(Class<? extends InetAddress> preferredAddressType) {
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this.preferredAddressType = requireNonNull(preferredAddressType, "preferredAddressType");
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}
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@Override
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public int compare(InetSocketAddress addr1, InetSocketAddress addr2) {
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if (addr1.equals(addr2)) {
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return 0;
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}
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if (!addr1.isUnresolved() && !addr2.isUnresolved()) {
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if (addr1.getAddress().getClass() == addr2.getAddress().getClass()) {
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return 0;
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}
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return preferredAddressType.isAssignableFrom(addr1.getAddress().getClass()) ? -1 : 1;
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}
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if (addr1.isUnresolved() && addr2.isUnresolved()) {
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return 0;
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}
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return addr1.isUnresolved() ? 1 : -1;
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}
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}
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