Java tutorial
/* * Copyright 2015 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.rtsp; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import io.netty.handler.codec.UnsupportedMessageTypeException; import io.netty.handler.codec.http.HttpContent; import io.netty.handler.codec.http.HttpMessage; import io.netty.handler.codec.http.HttpObjectEncoder; import io.netty.handler.codec.http.HttpRequest; import io.netty.handler.codec.http.HttpResponse; import io.netty.util.CharsetUtil; import io.netty.util.internal.StringUtil; import static io.netty.handler.codec.http.HttpConstants.*; /** * Encodes an RTSP message represented in {@link HttpMessage} or an {@link HttpContent} into * a {@link ByteBuf}. */ public class RtspEncoder extends HttpObjectEncoder<HttpMessage> { private static final int CRLF_SHORT = (CR << 8) | LF; @Override public boolean acceptOutboundMessage(final Object msg) throws Exception { return super.acceptOutboundMessage(msg) && ((msg instanceof HttpRequest) || (msg instanceof HttpResponse)); } @Override protected void encodeInitialLine(final ByteBuf buf, final HttpMessage message) throws Exception { if (message instanceof HttpRequest) { HttpRequest request = (HttpRequest) message; ByteBufUtil.copy(request.method().asciiName(), buf); buf.writeByte(SP); buf.writeCharSequence(request.uri(), CharsetUtil.UTF_8); buf.writeByte(SP); buf.writeCharSequence(request.protocolVersion().toString(), CharsetUtil.US_ASCII); ByteBufUtil.writeShortBE(buf, CRLF_SHORT); } else if (message instanceof HttpResponse) { HttpResponse response = (HttpResponse) message; buf.writeCharSequence(response.protocolVersion().toString(), CharsetUtil.US_ASCII); buf.writeByte(SP); ByteBufUtil.copy(response.status().codeAsText(), buf); buf.writeByte(SP); buf.writeCharSequence(response.status().reasonPhrase(), CharsetUtil.US_ASCII); ByteBufUtil.writeShortBE(buf, CRLF_SHORT); } else { throw new UnsupportedMessageTypeException("Unsupported type " + StringUtil.simpleClassName(message)); } } }