/*
* Copyright 2013 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:
*
* 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 io.netty.handler.codec.http.websocketx;
import io.netty.buffer.
ByteBuf;
import io.netty.channel.
ChannelPipeline;
import io.netty.handler.codec.
MessageAggregator;
import io.netty.handler.codec.
TooLongFrameException;
/**
* Handler that aggregate fragmented WebSocketFrame's.
*
* Be aware if PING/PONG/CLOSE frames are send in the middle of a fragmented {@link WebSocketFrame} they will
* just get forwarded to the next handler in the pipeline.
*/
public class
WebSocketFrameAggregator
extends
MessageAggregator<
WebSocketFrame,
WebSocketFrame,
ContinuationWebSocketFrame,
WebSocketFrame> {
/**
* Creates a new instance
*
* @param maxContentLength If the size of the aggregated frame exceeds this value,
* a {@link TooLongFrameException} is thrown.
*/
public
WebSocketFrameAggregator(int
maxContentLength) {
super(
maxContentLength);
}
@
Override
protected boolean
isStartMessage(
WebSocketFrame msg) throws
Exception {
return
msg instanceof
TextWebSocketFrame ||
msg instanceof
BinaryWebSocketFrame;
}
@
Override
protected boolean
isContentMessage(
WebSocketFrame msg) throws
Exception {
return
msg instanceof
ContinuationWebSocketFrame;
}
@
Override
protected boolean
isLastContentMessage(
ContinuationWebSocketFrame msg) throws
Exception {
return
isContentMessage(
msg) &&
msg.
isFinalFragment();
}
@
Override
protected boolean
isAggregated(
WebSocketFrame msg) throws
Exception {
if (
msg.
isFinalFragment()) {
return !
isContentMessage(
msg);
}
return !
isStartMessage(
msg) && !
isContentMessage(
msg);
}
@
Override
protected boolean
isContentLengthInvalid(
WebSocketFrame start, int
maxContentLength) {
return false;
}
@
Override
protected
Object newContinueResponse(
WebSocketFrame start, int
maxContentLength,
ChannelPipeline pipeline) {
return null;
}
@
Override
protected boolean
closeAfterContinueResponse(
Object msg) throws
Exception {
throw new
UnsupportedOperationException();
}
@
Override
protected boolean
ignoreContentAfterContinueResponse(
Object msg) throws
Exception {
throw new
UnsupportedOperationException();
}
@
Override
protected
WebSocketFrame beginAggregation(
WebSocketFrame start,
ByteBuf content) throws
Exception {
if (
start instanceof
TextWebSocketFrame) {
return new
TextWebSocketFrame(true,
start.
rsv(),
content);
}
if (
start instanceof
BinaryWebSocketFrame) {
return new
BinaryWebSocketFrame(true,
start.
rsv(),
content);
}
// Should not reach here.
throw new
Error();
}
}