com.github.mauricio.async.db.mysql.decoder.ResultSetRowDecoder.scala Maven / Gradle / Ivy

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/*
 * Copyright 2013 Maurício Linhares
 *
 * Maurício Linhares 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 com.github.mauricio.async.db.mysql.decoder

import java.nio.charset.Charset

import com.github.mauricio.async.db.mysql.message.server.{ResultSetRowMessage, ServerMessage}
import com.github.mauricio.async.db.util.ChannelWrapper.bufferToWrapper
import io.netty.buffer.ByteBuf

object ResultSetRowDecoder {

  final val NULL = 0xfb

}

class ResultSetRowDecoder(charset: Charset) extends MessageDecoder {

  import com.github.mauricio.async.db.mysql.decoder.ResultSetRowDecoder.NULL

  def decode(buffer: ByteBuf): ServerMessage = {
    val row = new ResultSetRowMessage()

    while (buffer.isReadable()) {
      if (buffer.getUnsignedByte(buffer.readerIndex()) == NULL) {
        buffer.readByte()
        row += null
      } else {
        val length = buffer.readBinaryLength.asInstanceOf[Int]
        row += buffer.readBytes(length)
      }
    }

    row
  }
}