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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.mina.http.api;
21  
22  /**
23   * Type safe enumeration representing HTTP protocol version
24   * 
25   * @author The Apache MINA Project (dev@mina.apache.org)
26   */
27  public enum HttpVersion {
28      /**
29       * HTTP 1/1
30       */
31      HTTP_1_1("HTTP/1.1"),
32  
33      /**
34       * HTTP 1/0
35       */
36      HTTP_1_0("HTTP/1.0");
37  
38      private final String value;
39  
40      private HttpVersion(String value) {
41          this.value = value;
42      }
43  
44      /**
45       * Returns the {@link HttpVersion} instance from the specified string.
46       * 
47       * @return The version, or <code>null</code> if no version is found
48       */
49      public static HttpVersion fromString(String string) {
50          if (HTTP_1_1.toString().equalsIgnoreCase(string)) {
51              return HTTP_1_1;
52          }
53  
54          if (HTTP_1_0.toString().equalsIgnoreCase(string)) {
55              return HTTP_1_0;
56          }
57  
58          return null;
59      }
60  
61      /**
62       * @return A String representation of this version
63       */
64      @Override
65      public String toString() {
66          return value;
67      }
68  
69  }