io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder Maven / Gradle / Ivy

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/*
 * Copyright 2012 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:
 *
 *   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 io.netty.handler.codec.http.websocketx;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.util.List;

/**
 * Encodes a {@link WebSocketFrame} into a {@link ByteBuf}.
 * 
 * For the detailed instruction on adding add Web Socket support to your HTTP server, take a look into the
 * WebSocketServer example located in the {@code io.netty.example.http.websocket} package.
 */
@Sharable
public class WebSocket00FrameEncoder extends MessageToMessageEncoder implements WebSocketFrameEncoder {
    private static final ByteBuf _0X00 = Unpooled.unreleasableBuffer(
            Unpooled.directBuffer(1, 1).writeByte((byte) 0x00)).asReadOnly();
    private static final ByteBuf _0XFF = Unpooled.unreleasableBuffer(
            Unpooled.directBuffer(1, 1).writeByte((byte) 0xFF)).asReadOnly();
    private static final ByteBuf _0XFF_0X00 = Unpooled.unreleasableBuffer(
            Unpooled.directBuffer(2, 2).writeByte((byte) 0xFF).writeByte((byte) 0x00)).asReadOnly();

    @Override
    protected void encode(ChannelHandlerContext ctx, WebSocketFrame msg, List