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NpgsqlTypeHandlerFactory.cs
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75 lines (69 loc) · 3.25 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2017 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 Npgsql.BackendMessages;
using Npgsql.PostgresTypes;
using Npgsql.TypeMapping;
namespace Npgsql.TypeHandling
{
/// <summary>
/// Base class for all type handler factories, which construct type handlers that know how
/// to read and write CLR types from/to PostgreSQL types.
/// Do not inherit from this class, inherit from <see cref="NpgsqlTypeHandlerFactory{T}"/> instead.
/// </summary>
public abstract class NpgsqlTypeHandlerFactory
{
internal abstract NpgsqlTypeHandler Create(PostgresType pgType, NpgsqlConnection conn);
/// <summary>
/// The default CLR type that handlers produced by this factory will read and write.
/// </summary>
internal abstract Type DefaultValueType { get; }
}
/// <summary>
/// Base class for all type handler factories, which construct type handlers that know how
/// to read and write CLR types from/to PostgreSQL types. Type handler factories are set up
/// via <see cref="NpgsqlTypeMapping"/> in either the global or connection-specific type mapper.
/// </summary>
/// <seealso cref="NpgsqlTypeMapping"/>
/// <seealso cref="NpgsqlConnection.GlobalTypeMapper"/>
/// <seealso cref="NpgsqlConnection.TypeMapper"/>
/// <typeparam name="TDefault">The default CLR type that handlers produced by this factory will read and write.</typeparam>
public abstract class NpgsqlTypeHandlerFactory<TDefault> : NpgsqlTypeHandlerFactory
{
internal override NpgsqlTypeHandler Create(PostgresType pgType, NpgsqlConnection conn)
{
var handler = Create(conn);
handler.PostgresType = pgType;
return handler;
}
/// <summary>
/// Creates a type handler. The provided connection can be examined to modify type handler
/// behavior based on server settings, etc.
/// </summary>
protected abstract NpgsqlTypeHandler<TDefault> Create(NpgsqlConnection conn);
/// <summary>
/// The default CLR type that handlers produced by this factory will read and write.
/// </summary>
internal override Type DefaultValueType => typeof(TDefault);
}
}