DnsOpCode.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 static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * The DNS {@code OpCode} as defined in <a href="https://tools.ietf.org/html/rfc2929">RFC2929</a>.
 */
public class DnsOpCode implements Comparable<DnsOpCode> {

    /**
     * The 'Query' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
     */
    public static final DnsOpCode QUERY = new DnsOpCode(0x00, "QUERY");

    /**
     * The 'IQuery' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
     */
    public static final DnsOpCode IQUERY = new DnsOpCode(0x01, "IQUERY");

    /**
     * The 'Status' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
     */
    public static final DnsOpCode STATUS = new DnsOpCode(0x02, "STATUS");

    /**
     * The 'Notify' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1996">RFC1996</a>.
     */
    public static final DnsOpCode NOTIFY = new DnsOpCode(0x04, "NOTIFY");

    /**
     * The 'Update' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc2136">RFC2136</a>.
     */
    public static final DnsOpCode UPDATE = new DnsOpCode(0x05, "UPDATE");

    /**
     * Returns the {@link DnsOpCode} instance of the specified byte value.
     */
    public static DnsOpCode valueOf(int b) {
        switch (b) {
        case 0x00:
            return QUERY;
        case 0x01:
            return IQUERY;
        case 0x02:
            return STATUS;
// ... (61 more lines)