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/*
 * Licensed 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 org.nightcode.milter.codec;

import org.nightcode.milter.net.MilterPacket;

import java.util.List;

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

/**
 * Encodes a requested {@link MilterPacket} into a {@link ByteBuf}.
 */
public class MilterPacketEncoder extends MessageToMessageEncoder {

  @Override protected void encode(ChannelHandlerContext ctx, MilterPacket msg, List out) {
    ByteBuf buffer = Unpooled.buffer(MilterPacket.COMMAND_LENGTH + msg.payload().length);
    buffer.writeByte(msg.command());
    buffer.writeBytes(msg.payload());
    out.add(buffer);
  }
}