/*
* accept-version value takes form of "v1,v2,v3..."
* we need to return the highest supported version
*/
public void negotiateVersion(StompFrame frame) throws ActiveMQStompException {
String acceptVersion = frame.getHeader(Stomp.Headers.ACCEPT_VERSION);
if (acceptVersion == null) {
this.version = StompVersions.V1_0;
} else {
StringTokenizer tokenizer = new StringTokenizer(acceptVersion, ",");
Set<String> requestVersions = new HashSet<String>(tokenizer.countTokens());
while (tokenizer.hasMoreTokens()) {
requestVersions.add(tokenizer.nextToken());
}
if (requestVersions.contains(StompVersions.V1_2.toString())) {
this.version = StompVersions.V1_2;
} else if (requestVersions.contains(StompVersions.V1_1.toString())) {
this.version = StompVersions.V1_1;
} else if (requestVersions.contains(StompVersions.V1_0.toString())) {
this.version = StompVersions.V1_0;
} else {
// not a supported version!
ActiveMQStompException error =
BUNDLE.versionNotSupported(acceptVersion).setHandler(frameHandler);
error.addHeader(Stomp.Headers.Error.VERSION, manager.getSupportedVersionsAsErrorVersion());
error.addHeader(Stomp.Headers.CONTENT_TYPE, "text/plain");
error.setBody("Supported protocol versions are " + manager.getSupportedVersionsAsString());
error.setDisconnect(true);
throw error;
}
}
if (this.version != (StompVersions.V1_0)) {
VersionedStompFrameHandler newHandler =
VersionedStompFrameHandler.getHandler(this, this.version);
newHandler.initDecoder(this.frameHandler);
this.frameHandler = newHandler;
}
this.initialized = true;
}
