/*
    * 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.netty5.example.http.websocketx.server;
  
  import io.netty5.channel.ChannelHandlerContext;
  import io.netty5.channel.SimpleChannelInboundHandler;
  import io.netty5.handler.codec.http.websocketx.TextWebSocketFrame;
  import io.netty5.handler.codec.http.websocketx.WebSocketFrame;
  
  import java.util.Locale;
  
  /**
   * Echoes uppercase content of text frames.
   */
  public class WebSocketFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
  
      @Override
      protected void messageReceived(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
          // ping and pong frames already handled
  
          if (frame instanceof TextWebSocketFrame) {
              // Send the uppercase string back.
              String request = ((TextWebSocketFrame) frame).text();
              ctx.channel().writeAndFlush(new TextWebSocketFrame(ctx.bufferAllocator(), request.toUpperCase(Locale.US)));
          } else {
              String message = "unsupported frame type: " + frame.getClass().getName();
              throw new UnsupportedOperationException(message);
          }
      }
  }