/*
* Copyright 2014 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.stomp;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.AsciiHeadersEncoder;
import io.netty.handler.codec.AsciiHeadersEncoder.NewlineType;
import io.netty.handler.codec.AsciiHeadersEncoder.SeparatorType;
import io.netty.handler.codec.MessageToMessageEncoder;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.PlatformDependent;
import java.util.List;
/**
* Encodes a {@link StompFrame} or a {@link StompSubframe} into a {@link ByteBuf}.
*/
public class StompSubframeEncoder extends MessageToMessageEncoder<StompSubframe> {
@Override
protected void encode(ChannelHandlerContext ctx, StompSubframe msg, List<Object> out) throws Exception {
if (msg instanceof StompFrame) {
StompFrame frame = (StompFrame) msg;
ByteBuf frameBuf = encodeFrame(frame, ctx);
out.add(frameBuf);
ByteBuf contentBuf = encodeContent(frame, ctx);
out.add(contentBuf);
} else if (msg instanceof StompHeadersSubframe) {
StompHeadersSubframe frame = (StompHeadersSubframe) msg;
ByteBuf buf = encodeFrame(frame, ctx);
out.add(buf);
} else if (msg instanceof StompContentSubframe) {
StompContentSubframe stompContentSubframe = (StompContentSubframe) msg;
ByteBuf buf = encodeContent(stompContentSubframe, ctx);
out.add(buf);
}
}
private static ByteBuf encodeContent(StompContentSubframe content, ChannelHandlerContext ctx) {
if (content instanceof LastStompContentSubframe) {
ByteBuf buf = ctx.alloc().buffer(content.content().readableBytes() + 1);
buf.writeBytes(content.content());
buf.writeByte(StompConstants.NUL);
return buf;
} else {
return content.content().retain();
}
}
private static ByteBuf encodeFrame(StompHeadersSubframe frame, ChannelHandlerContext ctx) {
ByteBuf buf = ctx.alloc().buffer();
buf.writeBytes(frame.command().toString().getBytes(CharsetUtil.US_ASCII));
buf.writeByte(StompConstants.LF);
try {
frame.headers().forEachEntry(new AsciiHeadersEncoder(buf, SeparatorType.COLON, NewlineType.LF));
} catch (Exception ex) {
buf.release();
PlatformDependent.throwException(ex);
}
buf.writeByte(StompConstants.LF);
return buf;
}
}