e8efcd82a8
Motivation: We can just use Objects.requireNonNull(...) as a replacement for ObjectUtil.checkNotNull(....) Modifications: - Use Objects.requireNonNull(...) Result: Less code to maintain.
122 lines
3.3 KiB
Java
122 lines
3.3 KiB
Java
/*
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* Copyright 2015 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.dns;
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import io.netty.util.internal.UnstableApi;
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import static java.util.Objects.requireNonNull;
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/**
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* The DNS {@code OpCode} as defined in <a href="https://tools.ietf.org/html/rfc2929">RFC2929</a>.
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*/
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@UnstableApi
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public class DnsOpCode implements Comparable<DnsOpCode> {
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/**
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* The 'Query' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
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*/
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public static final DnsOpCode QUERY = new DnsOpCode(0x00, "QUERY");
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/**
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* The 'IQuery' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
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*/
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public static final DnsOpCode IQUERY = new DnsOpCode(0x01, "IQUERY");
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/**
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* The 'Status' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1035">RFC1035</a>.
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*/
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public static final DnsOpCode STATUS = new DnsOpCode(0x02, "STATUS");
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/**
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* The 'Notify' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc1996">RFC1996</a>.
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*/
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public static final DnsOpCode NOTIFY = new DnsOpCode(0x04, "NOTIFY");
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/**
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* The 'Update' DNS OpCode, as defined in <a href="https://tools.ietf.org/html/rfc2136">RFC2136</a>.
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*/
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public static final DnsOpCode UPDATE = new DnsOpCode(0x05, "UPDATE");
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/**
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* Returns the {@link DnsOpCode} instance of the specified byte value.
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*/
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public static DnsOpCode valueOf(int b) {
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switch (b) {
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case 0x00:
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return QUERY;
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case 0x01:
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return IQUERY;
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case 0x02:
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return STATUS;
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case 0x04:
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return NOTIFY;
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case 0x05:
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return UPDATE;
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}
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return new DnsOpCode(b);
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}
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private final byte byteValue;
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private final String name;
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private String text;
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private DnsOpCode(int byteValue) {
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this(byteValue, "UNKNOWN");
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}
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public DnsOpCode(int byteValue, String name) {
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this.byteValue = (byte) byteValue;
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this.name = requireNonNull(name, "name");
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}
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public byte byteValue() {
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return byteValue;
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}
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@Override
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public int hashCode() {
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return byteValue;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (!(obj instanceof DnsOpCode)) {
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return false;
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}
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return byteValue == ((DnsOpCode) obj).byteValue;
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}
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@Override
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public int compareTo(DnsOpCode o) {
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return byteValue - o.byteValue;
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}
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@Override
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public String toString() {
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String text = this.text;
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if (text == null) {
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this.text = text = name + '(' + (byteValue & 0xFF) + ')';
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}
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return text;
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}
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}
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