1 /*
2 * Copyright (c) 2012 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://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,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.eclipse.jetty.spdy.api;
18
19 import java.util.HashMap;
20 import java.util.Map;
21
22 /**
23 * <p>An enumeration of stream statuses.</p>
24 */
25 public enum StreamStatus
26 {
27 /**
28 * <p>The stream status indicating a protocol error</p>
29 */
30 PROTOCOL_ERROR(1, 1),
31 /**
32 * <p>The stream status indicating that the stream is not valid</p>
33 */
34 INVALID_STREAM(2, 2),
35 /**
36 * <p>The stream status indicating that the stream has been refused</p>
37 */
38 REFUSED_STREAM(3, 3),
39 /**
40 * <p>The stream status indicating that the implementation does not support the SPDY version of the stream</p>
41 */
42 UNSUPPORTED_VERSION(4, 4),
43 /**
44 * <p>The stream status indicating that the stream is no longer needed</p>
45 */
46 CANCEL_STREAM(5, 5),
47 /**
48 * <p>The stream status indicating an implementation error</p>
49 */
50 INTERNAL_ERROR(6, 6),
51 /**
52 * <p>The stream status indicating a flow control error</p>
53 */
54 FLOW_CONTROL_ERROR(7, 7),
55 /**
56 * <p>The stream status indicating a stream opened more than once</p>
57 */
58 STREAM_IN_USE(-1, 8),
59 /**
60 * <p>The stream status indicating data on a stream already closed</p>
61 */
62 STREAM_ALREADY_CLOSED(-1, 9),
63 /**
64 * <p>The stream status indicating credentials not valid</p>
65 */
66 INVALID_CREDENTIALS(-1, 10),
67 /**
68 * <p>The stream status indicating that the implementation could not support a frame too large</p>
69 */
70 FRAME_TOO_LARGE(-1, 11);
71
72 /**
73 * @param version the SPDY protocol version
74 * @param code the stream status code
75 * @return a {@link StreamStatus} from the given version and code,
76 * or null if no such status exists
77 */
78 public static StreamStatus from(short version, int code)
79 {
80 switch (version)
81 {
82 case SPDY.V2:
83 return Codes.v2Codes.get(code);
84 case SPDY.V3:
85 return Codes.v3Codes.get(code);
86 default:
87 throw new IllegalStateException();
88 }
89 }
90
91 private final int v2Code;
92 private final int v3Code;
93
94 private StreamStatus(int v2Code, int v3Code)
95 {
96 this.v2Code = v2Code;
97 if (v2Code >= 0)
98 Codes.v2Codes.put(v2Code, this);
99 this.v3Code = v3Code;
100 if (v3Code >= 0)
101 Codes.v3Codes.put(v3Code, this);
102 }
103
104 /**
105 * @param version the SPDY protocol version
106 * @return the stream status code
107 */
108 public int getCode(short version)
109 {
110 switch (version)
111 {
112 case SPDY.V2:
113 return v2Code;
114 case SPDY.V3:
115 return v3Code;
116 default:
117 throw new IllegalStateException();
118 }
119 }
120
121 private static class Codes
122 {
123 private static final Map<Integer, StreamStatus> v2Codes = new HashMap<>();
124 private static final Map<Integer, StreamStatus> v3Codes = new HashMap<>();
125 }
126 }