85 lines
3.4 KiB
Java
85 lines
3.4 KiB
Java
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.stomp;
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import java.util.Iterator;
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import java.util.List;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToMessageEncoder;
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import io.netty.util.CharsetUtil;
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/**
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* Encodes a {@link StompFrame} or a {@link FullStompFrame} or a {@link StompContent} into a {@link ByteBuf}.
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*/
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public class StompEncoder extends MessageToMessageEncoder<StompObject> {
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@Override
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protected void encode(ChannelHandlerContext ctx, StompObject msg, List<Object> out) throws Exception {
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if (msg instanceof FullStompFrame) {
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FullStompFrame frame = (FullStompFrame) msg;
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ByteBuf frameBuf = encodeFrame(frame, ctx);
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out.add(frameBuf);
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ByteBuf contentBuf = encodeContent(frame, ctx);
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out.add(contentBuf);
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} else if (msg instanceof StompFrame) {
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StompFrame frame = (StompFrame) msg;
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ByteBuf buf = encodeFrame(frame, ctx);
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out.add(buf);
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} else if (msg instanceof StompContent) {
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StompContent stompContent = (StompContent) msg;
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ByteBuf buf = encodeContent(stompContent, ctx);
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out.add(buf);
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}
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}
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private ByteBuf encodeContent(StompContent content, ChannelHandlerContext ctx) {
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if (content instanceof LastStompContent) {
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ByteBuf buf = ctx.alloc().buffer(content.content().readableBytes() + 1);
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buf.writeBytes(content.content());
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buf.writeByte(StompConstants.NULL);
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return buf;
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} else {
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ByteBuf buf = ctx.alloc().buffer(content.content().readableBytes());
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buf.writeBytes(content.content());
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return buf;
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}
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}
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private ByteBuf encodeFrame(StompFrame frame, ChannelHandlerContext ctx) {
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ByteBuf buf = ctx.alloc().buffer();
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buf.writeBytes(frame.command().toString().getBytes(CharsetUtil.US_ASCII));
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buf.writeByte(StompConstants.CR).writeByte(StompConstants.LF);
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StompHeaders headers = frame.headers();
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for (Iterator<String> iterator = headers.keySet().iterator(); iterator.hasNext();) {
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String key = iterator.next();
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List<String> values = headers.getAll(key);
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for (Iterator<String> stringIterator = values.iterator(); stringIterator.hasNext();) {
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String value = stringIterator.next();
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buf.writeBytes(key.getBytes(CharsetUtil.US_ASCII)).
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writeByte(StompConstants.COLON).writeBytes(value.getBytes(CharsetUtil.US_ASCII));
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buf.writeByte(StompConstants.CR).writeByte(StompConstants.LF);
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}
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}
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buf.writeByte(StompConstants.CR).writeByte(StompConstants.LF);
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return buf;
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}
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}
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