com.arangodb.shaded.netty.resolver.dns.PreferredAddressTypeComparator Maven / Gradle / Ivy
/*
* Copyright 2019 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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.arangodb.shaded.netty.resolver.dns;
import com.arangodb.shaded.netty.channel.socket.InternetProtocolFamily;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.util.Comparator;
final class PreferredAddressTypeComparator implements Comparator {
private static final PreferredAddressTypeComparator IPv4 = new PreferredAddressTypeComparator(Inet4Address.class);
private static final PreferredAddressTypeComparator IPv6 = new PreferredAddressTypeComparator(Inet6Address.class);
static PreferredAddressTypeComparator comparator(InternetProtocolFamily family) {
switch (family) {
case IPv4:
return IPv4;
case IPv6:
return IPv6;
default:
throw new IllegalArgumentException();
}
}
private final Class preferredAddressType;
private PreferredAddressTypeComparator(Class preferredAddressType) {
this.preferredAddressType = preferredAddressType;
}
@Override
public int compare(InetAddress o1, InetAddress o2) {
if (o1.getClass() == o2.getClass()) {
return 0;
}
return preferredAddressType.isAssignableFrom(o1.getClass()) ? -1 : 1;
}
}