code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.stack.core.channel.messages;
  
  import com.google.common.base.MoreObjects;
  import com.google.common.base.Preconditions;
  import io.netty.buffer.ByteBuf;
  import org.eclipse.milo.opcua.stack.core.util.annotations.UInt32Primitive;
  
  public class AcknowledgeMessage {
  
      @UInt32Primitive
      private final long protocolVersion;
  
      @UInt32Primitive
      private final long receiveBufferSize;
  
      @UInt32Primitive
      private final long sendBufferSize;
  
      @UInt32Primitive
      private final long maxMessageSize;
  
      @UInt32Primitive
      private final long maxChunkCount;
  
      /**
       * @param protocolVersion   The latest version of the OPC UA TCP protocol supported by the Server.
       * @param receiveBufferSize The largest MessageChunk that the sender can receive. This value shall not be larger
       *                          than what the Client requested in the Hello Message. This value shall be greater than
       *                          or equal to 8192 bytes.
       * @param sendBufferSize    The largest MessageChunk that the sender will send. This value shall not be larger than
       *                          what the Client requested in the Hello Message. This value shall be greater than or
       *                          equal to 8192 bytes.
       * @param maxMessageSize    The maximum size for any request Message. The maximum size for any request Message. The
       *                          Client shall abort the Message with a Bad_RequestTooLarge StatusCode if a request
       *                          Message exceeds this value. The Message size is calculated using the unencrypted Message
       *                          body. A value of zero indicates that the Server has no limit.
       * @param maxChunkCount     The maximum number of chunks in any request Message. A value of zero indicates that the
       *                          Server has no limit.
       */
      public AcknowledgeMessage(@UInt32Primitive long protocolVersion,
                                @UInt32Primitive long receiveBufferSize,
                                @UInt32Primitive long sendBufferSize,
                                @UInt32Primitive long maxMessageSize,
                                @UInt32Primitive long maxChunkCount) {
  
          Preconditions.checkArgument(receiveBufferSize >= 8192,
              "receiverBufferSize must be greater than or equal to 8192");
  
          Preconditions.checkArgument(sendBufferSize >= 8192,
              "sendBufferSize must be greater than or equal to 8192");
  
          this.protocolVersion = protocolVersion;
          this.receiveBufferSize = receiveBufferSize;
          this.sendBufferSize = sendBufferSize;
          this.maxMessageSize = maxMessageSize;
          this.maxChunkCount = maxChunkCount;
      }
  
      @UInt32Primitive
      public long getProtocolVersion() {
          return protocolVersion;
      }
  
      @UInt32Primitive
      public long getReceiveBufferSize() {
          return receiveBufferSize;
      }
  
      @UInt32Primitive
      public long getSendBufferSize() {
          return sendBufferSize;
      }
  
      @UInt32Primitive
      public long getMaxMessageSize() {
          return maxMessageSize;
      }
  
      @UInt32Primitive
      public long getMaxChunkCount() {
          return maxChunkCount;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          AcknowledgeMessage that = (AcknowledgeMessage) o;
  
          return maxChunkCount == that.maxChunkCount &&
              maxMessageSize == that.maxMessageSize &&
              protocolVersion == that.protocolVersion &&
              receiveBufferSize == that.receiveBufferSize &&
              sendBufferSize == that.sendBufferSize;
      }
  
      @Override
      public int hashCode() {
          int result = (int) (protocolVersion ^ (protocolVersion >>> 32));
          result = 31 * result + (int) (receiveBufferSize ^ (receiveBufferSize >>> 32));
          result = 31 * result + (int) (sendBufferSize ^ (sendBufferSize >>> 32));
          result = 31 * result + (int) (maxMessageSize ^ (maxMessageSize >>> 32));
          result = 31 * result + (int) (maxChunkCount ^ (maxChunkCount >>> 32));
          return result;
      }
  
      @Override
      public String toString() {
          return MoreObjects.toStringHelper(this)
              .add("protocolVersion", protocolVersion)
              .add("receiverBufferSize", receiveBufferSize)
              .add("sendBufferSize", sendBufferSize)
              .add("maxMessageSize", maxMessageSize)
              .add("maxChunkCount", maxChunkCount)
              .toString();
      }
  
      public static void encode(AcknowledgeMessage message, ByteBuf buffer) {
          buffer.writeIntLE((int) message.getProtocolVersion());
          buffer.writeIntLE((int) message.getReceiveBufferSize());
          buffer.writeIntLE((int) message.getSendBufferSize());
          buffer.writeIntLE((int) message.getMaxMessageSize());
          buffer.writeIntLE((int) message.getMaxChunkCount());
      }
  
      public static AcknowledgeMessage decode(ByteBuf buffer) {
          return new AcknowledgeMessage(
              buffer.readUnsignedIntLE(), /*    ProtocolVersion     */
              buffer.readUnsignedIntLE(), /*    ReceiveBufferSize   */
              buffer.readUnsignedIntLE(), /*    SendBufferSize      */
              buffer.readUnsignedIntLE(), /*    MaxMessageSize      */
              buffer.readUnsignedIntLE()  /*    MaxChunkCount       */
          );
      }
  
  }
  