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/*
* DirectRouter.java February 2014
*
* Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net>
*
* Licensed 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
*
* http://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 org.simpleframework.http.socket.service;
import static org.simpleframework.http.Protocol.SEC_WEBSOCKET_PROTOCOL;
import static org.simpleframework.http.Protocol.SEC_WEBSOCKET_VERSION;
import static org.simpleframework.http.Protocol.UPGRADE;
import static org.simpleframework.http.Protocol.WEBSOCKET;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
/**
* The <code>DirectRouter</code> object is used to create a router
* that uses a single service. Typically this is used by simpler
* servers that wish to expose a single sub-protocol to clients.
*
* @author Niall Gallagher
*
* @see org.simpleframework.http.socket.service.RouterContainer
*/
public class DirectRouter implements Router {
/**
* The service used by this router instance.
*/
private final Service service;
/**
* The protocol used or null if none was specified.
*/
private final String protocol;
/**
* Constructor for the <code>DirectRouter</code> object. This
* is used to create an object that will select a single service.
* Creating an instance with this constructor means that the
* protocol header will not be set.
*
* @param service this is the service used by this instance
* @param protocol the protocol used by this router or null
*/
public DirectRouter(Service service) {
this(service, null);
}
/**
* Constructor for the <code>DirectRouter</code> object. This
* is used to create an object that will select a single service.
* If the protocol specified is null then the response to the
* session initiation will contain null for the protocol header.
*
* @param service this is the service used by this instance
* @param protocol the protocol used by this router or null
*/
public DirectRouter(Service service, String protocol) {
this.protocol = protocol;
this.service = service;
}
/**
* This is used to route an incoming request to a service if
* the request represents a WebSocket handshake as defined by
* RFC 6455. If the request is not a session initiating handshake
* then this will return a null value to allow it to be processed
* by some other part of the server.
*
* @param request this is the request to use for routing
* @param response this is the response to establish the session
*
* @return a service that can be used to process the session
*/
public Service route(Request request, Response response) {
String token = request.getValue(UPGRADE);
if(token != null) {
if(token.equalsIgnoreCase(WEBSOCKET)) {
String version = request.getValue(SEC_WEBSOCKET_VERSION);
if(version != null) {
response.setValue(SEC_WEBSOCKET_VERSION, version);
}
if(protocol != null) {
response.setValue(SEC_WEBSOCKET_PROTOCOL, protocol);
}
return service;
}
}
return null;
}
}
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