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CopyMessages.cs
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executable file
·133 lines (114 loc) · 4.28 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Npgsql.BackendMessages
{
abstract class CopyResponseMessageBase : IBackendMessage
{
public abstract BackendMessageCode Code { get; }
internal bool IsBinary { get; private set; }
internal short NumColumns { get; private set; }
internal List<FormatCode> ColumnFormatCodes { get; private set; }
internal CopyResponseMessageBase()
{
ColumnFormatCodes = new List<FormatCode>();
}
internal void Load(NpgsqlBuffer buf)
{
ColumnFormatCodes.Clear();
var binaryIndicator = buf.ReadByte();
switch (binaryIndicator) {
case 0:
IsBinary = false;
break;
case 1:
IsBinary = true;
break;
default:
throw new Exception("Invalid binary indicator in CopyInResponse message: " + binaryIndicator);
}
NumColumns = buf.ReadInt16();
for (var i = 0; i < NumColumns; i++)
ColumnFormatCodes.Add((FormatCode)buf.ReadInt16());
}
}
class CopyInResponseMessage : CopyResponseMessageBase
{
public override BackendMessageCode Code { get { return BackendMessageCode.CopyInResponse; } }
internal new CopyInResponseMessage Load(NpgsqlBuffer buf)
{
base.Load(buf);
return this;
}
}
class CopyOutResponseMessage : CopyResponseMessageBase
{
public override BackendMessageCode Code { get { return BackendMessageCode.CopyOutResponse; } }
internal new CopyOutResponseMessage Load(NpgsqlBuffer buf)
{
base.Load(buf);
return this;
}
}
class CopyBothResponseMessage : CopyResponseMessageBase
{
public override BackendMessageCode Code { get { return BackendMessageCode.CopyBothResponse; } }
internal new CopyBothResponseMessage Load(NpgsqlBuffer buf)
{
base.Load(buf);
return this;
}
}
/// <summary>
/// Note that this message doesn't actually contain the data, but only the length. Data is processed
/// directly from the connector's buffer.
/// </summary>
class CopyDataMessage : IBackendMessage
{
public BackendMessageCode Code { get { return BackendMessageCode.CopyData; } }
public int Length { get; private set; }
internal CopyDataMessage Load(int len)
{
Length = len;
return this;
}
}
/// <remarks>
/// Note: This message is both a frontend and a backend message
/// </remarks>
class CopyDoneMessage : SimpleFrontendMessage, IBackendMessage
{
public BackendMessageCode Code { get { return BackendMessageCode.CopyDone; } }
internal static readonly CopyDoneMessage Instance = new CopyDoneMessage();
CopyDoneMessage() { }
internal override int Length { get { return 5; } }
internal override void Write(NpgsqlBuffer buf)
{
buf.WriteByte((byte)BackendMessageCode.CopyDone);
buf.WriteInt32(4);
}
}
}