io.netty.handler.codec.http.websocketx.WebSocketVersion Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.util.AsciiString;
import io.netty.util.internal.StringUtil;
/**
*
* Versions of the web socket specification.
*
*
* A specification is tied to one wire protocol version but a protocol version may have use by more than 1 version of
* the specification.
*
*/
public enum WebSocketVersion {
UNKNOWN(AsciiString.cached(StringUtil.EMPTY_STRING)),
/**
* draft-ietf-hybi-thewebsocketprotocol- 00.
*/
V00(AsciiString.cached("0")),
/**
* draft-ietf-hybi-thewebsocketprotocol- 07
*/
V07(AsciiString.cached("7")),
/**
* draft-ietf-hybi-thewebsocketprotocol- 10
*/
V08(AsciiString.cached("8")),
/**
* RFC 6455. This was originally draft-ietf-hybi-thewebsocketprotocol-
* 17
*/
V13(AsciiString.cached("13"));
private final AsciiString headerValue;
WebSocketVersion(AsciiString headerValue) {
this.headerValue = headerValue;
}
/**
* @return Value for HTTP Header 'Sec-WebSocket-Version'
*/
public String toHttpHeaderValue() {
return toAsciiString().toString();
}
AsciiString toAsciiString() {
if (this == UNKNOWN) {
// Let's special case this to preserve behaviour
throw new IllegalStateException("Unknown web socket version: " + this);
}
return headerValue;
}
}