DnsRecordType.java — netty Source File

Source Code

/*
 * Copyright 2015 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.handler.codec.dns;

import io.netty.util.collection.IntObjectHashMap;

import java.util.HashMap;
import java.util.Map;

/**
 * Represents a DNS record type.
 */
public class DnsRecordType implements Comparable<DnsRecordType> {

    /**
     * Address record RFC 1035 Returns a 32-bit IPv4 address, most commonly used
     * to map hostnames to an IP address of the host, but also used for DNSBLs,
     * storing subnet masks in RFC 1101, etc.
     */
    public static final DnsRecordType A = new DnsRecordType(0x0001, "A");

    /**
     * Name server record RFC 1035 Delegates a DNS zone to use the given
     * authoritative name servers
     */
    public static final DnsRecordType NS = new DnsRecordType(0x0002, "NS");

    /**
     * Canonical name record RFC 1035 Alias of one name to another: the DNS
     * lookup will continue by retrying the lookup with the new name.
     */
    public static final DnsRecordType CNAME = new DnsRecordType(0x0005, "CNAME");

    /**
     * Start of [a zone of] authority record RFC 1035 and RFC 2308 Specifies
     * authoritative information about a DNS zone, including the primary name
     * server, the email of the domain administrator, the domain serial number,
     * and several timers relating to refreshing the zone.
     */
    public static final DnsRecordType SOA = new DnsRecordType(0x0006, "SOA");

    /**
     * Pointer record RFC 1035 Pointer to a canonical name. Unlike a CNAME, DNS
     * processing does NOT proceed, just the name is returned. The most common
     * use is for implementing reverse DNS lookups, but other uses include such
     * things as DNS-SD.
     */
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