spring WebSocketHandlerDecorator 源码
spring WebSocketHandlerDecorator 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/handler/WebSocketHandlerDecorator.java
/*
* Copyright 2002-2013 the original author or authors.
*
* 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
*
* 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 org.springframework.web.socket.handler;
import org.springframework.util.Assert;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
/**
* Wraps another {@link org.springframework.web.socket.WebSocketHandler}
* instance and delegates to it.
*
* <p>Also provides a {@link #getDelegate()} method to return the decorated
* handler as well as a {@link #getLastHandler()} method to go through all nested
* delegates and return the "last" handler.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class WebSocketHandlerDecorator implements WebSocketHandler {
private final WebSocketHandler delegate;
public WebSocketHandlerDecorator(WebSocketHandler delegate) {
Assert.notNull(delegate, "Delegate must not be null");
this.delegate = delegate;
}
public WebSocketHandler getDelegate() {
return this.delegate;
}
public WebSocketHandler getLastHandler() {
WebSocketHandler result = this.delegate;
while (result instanceof WebSocketHandlerDecorator) {
result = ((WebSocketHandlerDecorator) result).getDelegate();
}
return result;
}
public static WebSocketHandler unwrap(WebSocketHandler handler) {
if (handler instanceof WebSocketHandlerDecorator) {
return ((WebSocketHandlerDecorator) handler).getLastHandler();
}
else {
return handler;
}
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
this.delegate.afterConnectionEstablished(session);
}
@Override
public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
this.delegate.handleMessage(session, message);
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
this.delegate.handleTransportError(session, exception);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
this.delegate.afterConnectionClosed(session, closeStatus);
}
@Override
public boolean supportsPartialMessages() {
return this.delegate.supportsPartialMessages();
}
@Override
public String toString() {
return getClass().getSimpleName() + " [delegate=" + this.delegate + "]";
}
}
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