1 /*
2 * Copyright 2014 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16
17 package io.netty.handler.codec.http;
18
19 import io.netty.util.AsciiString;
20
21 /**
22 * The class of HTTP status.
23 */
24 public enum HttpStatusClass {
25 /**
26 * The informational class (1xx)
27 */
28 INFORMATIONAL(100, 200, "Informational"),
29 /**
30 * The success class (2xx)
31 */
32 SUCCESS(200, 300, "Success"),
33 /**
34 * The redirection class (3xx)
35 */
36 REDIRECTION(300, 400, "Redirection"),
37 /**
38 * The client error class (4xx)
39 */
40 CLIENT_ERROR(400, 500, "Client Error"),
41 /**
42 * The server error class (5xx)
43 */
44 SERVER_ERROR(500, 600, "Server Error"),
45 /**
46 * The unknown class
47 */
48 UNKNOWN(0, 0, "Unknown Status") {
49 @Override
50 public boolean contains(int code) {
51 return code < 100 || code >= 600;
52 }
53 };
54
55 private static final HttpStatusClass[] statusArray = new HttpStatusClass[6];
56 static {
57 statusArray[1] = INFORMATIONAL;
58 statusArray[2] = SUCCESS;
59 statusArray[3] = REDIRECTION;
60 statusArray[4] = CLIENT_ERROR;
61 statusArray[5] = SERVER_ERROR;
62 }
63
64 /**
65 * Returns the class of the specified HTTP status code.
66 */
67 public static HttpStatusClass valueOf(int code) {
68 if (UNKNOWN.contains(code)) {
69 return UNKNOWN;
70 }
71 return statusArray[fast_div100(code)];
72 }
73
74 /**
75 * @param dividend Must >= 0
76 * @return dividend/100
77 */
78 private static int fast_div100(int dividend) {
79 return (int) ((dividend * 1374389535L) >> 37);
80 }
81
82 /**
83 * Returns the class of the specified HTTP status code.
84 * @param code Just the numeric portion of the http status code.
85 */
86 public static HttpStatusClass valueOf(CharSequence code) {
87 if (code != null && code.length() == 3) {
88 char c0 = code.charAt(0);
89 return isDigit(c0) && isDigit(code.charAt(1)) && isDigit(code.charAt(2)) ? valueOf(digit(c0) * 100)
90 : UNKNOWN;
91 }
92 return UNKNOWN;
93 }
94
95 private static int digit(char c) {
96 return c - '0';
97 }
98
99 private static boolean isDigit(char c) {
100 return c >= '0' && c <= '9';
101 }
102
103 private final int min;
104 private final int max;
105 private final AsciiString defaultReasonPhrase;
106
107 HttpStatusClass(int min, int max, String defaultReasonPhrase) {
108 this.min = min;
109 this.max = max;
110 this.defaultReasonPhrase = AsciiString.cached(defaultReasonPhrase);
111 }
112
113 /**
114 * Returns {@code true} if and only if the specified HTTP status code falls into this class.
115 */
116 public boolean contains(int code) {
117 return code >= min && code < max;
118 }
119
120 /**
121 * Returns the default reason phrase of this HTTP status class.
122 */
123 AsciiString defaultReasonPhrase() {
124 return defaultReasonPhrase;
125 }
126 }
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