001package voyeur;
002/*-
003 * ##########################################################################
004 * Local Area Network Voyeur
005 * %%
006 * Copyright (C) 2019 - 2022 Allen D. Ball
007 * %%
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *      http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 * ##########################################################################
020 */
021import java.math.BigInteger;
022import java.net.InetAddress;
023import java.util.Comparator;
024import java.util.concurrent.ConcurrentSkipListMap;
025
026/**
027 * {@link InetAddress} {@link java.util.Map} abstract base class.
028 *
029 * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
030 */
031public abstract class InetAddressMap<V> extends ConcurrentSkipListMap<InetAddress,V> {
032    private static final long serialVersionUID = 4096581096396052201L;
033
034    private static final Comparator<InetAddress> COMPARATOR =
035        Comparator
036        .<InetAddress>comparingInt(t -> t.isLoopbackAddress() ? -1 : 1)
037        .thenComparingInt(t -> t.getAddress().length)
038        .thenComparing(t -> new BigInteger(1, t.getAddress()));
039
040    /**
041     * Sole constructor.
042     */
043    protected InetAddressMap() { super(COMPARATOR); }
044}