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JDBC client implementation over Table client, single jar

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/*
 * Copyright 2017 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 io.netty.resolver;

import java.net.Inet4Address;
import java.net.Inet6Address;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * A container of hosts file entries
 */
public final class HostsFileEntries {

    /**
     * Empty entries
     */
    static final HostsFileEntries EMPTY =
            new HostsFileEntries(
                    Collections.emptyMap(),
                    Collections.emptyMap());

    private final Map inet4Entries;
    private final Map inet6Entries;

    public HostsFileEntries(Map inet4Entries, Map inet6Entries) {
        this.inet4Entries = Collections.unmodifiableMap(new HashMap(inet4Entries));
        this.inet6Entries = Collections.unmodifiableMap(new HashMap(inet6Entries));
    }

    /**
     * The IPv4 entries
     * @return the IPv4 entries
     */
    public Map inet4Entries() {
        return inet4Entries;
    }

    /**
     * The IPv6 entries
     * @return the IPv6 entries
     */
    public Map inet6Entries() {
        return inet6Entries;
    }
}