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    1   /*
    2    * Copyright 2012 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    *   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, 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  package org.jboss.netty.handler.codec.http.websocketx;
    17
    18  /**
    19   * <p>
    20   * Versions of the web socket specification.
    21   * </p>
    22   * <p>
    23   * A specification is tied to one wire protocol version but a protocol version may have use by more than 1 version of
    24   * the specification.
    25   * </p>
    26   */
    27  public enum WebSocketVersion {
    28      UNKNOWN,
    29
    30      /**
    31       * <a href= "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00"
    32       * >draft-ietf-hybi-thewebsocketprotocol- 00</a>.
    33       */
    34      V00,
    35
    36      /**
    37       * <a href= "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10"
    38       * >draft-ietf-hybi-thewebsocketprotocol- 10</a>
    39       */
    40      V08,
    41
    42      /**
    43       * <a href="http://tools.ietf.org/html/rfc6455 ">RFC 6455</a>. This was originally <a href=
    44       * "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17" >draft-ietf-hybi-thewebsocketprotocol-
    45       * 17</a>
    46       */
    47      V13;
    48
    49      /**
    50       * @return Value for HTTP Header 'Sec-WebSocket-Version'
    51       */
    52      public String toHttpHeaderValue() {
    53          if (this == V00) {
    54              return "0";
    55          } else if (this == V08) {
    56              return "8";
    57          } else if (this == V13) {
    58              return "13";
    59          }
    60          throw new IllegalStateException("Unknown web socket version: " + this);
    61      }
    62  }