using System;

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.

/// </summary>

/// <remarks>

/// In general, do not inherit from this class, inherit from <see cref="NpgsqlTypeHandlerFactory{T}"/> instead.

/// </remarks>

public abstract class NpgsqlTypeHandlerFactory

{

/// <summary>

/// Creates a type handler.

/// </summary>

public abstract NpgsqlTypeHandler CreateNonGeneric(PostgresType pgType, NpgsqlConnection conn);

/// <summary>

/// The default CLR type that handlers produced by this factory will read and write.

/// </summary>

public 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

{

/// <summary>

/// Creates a type handler.

/// </summary>

public abstract NpgsqlTypeHandler<TDefault> Create(PostgresType pgType, NpgsqlConnection conn);

/// <inheritdoc />

public override NpgsqlTypeHandler CreateNonGeneric(PostgresType pgType, NpgsqlConnection conn)

=> Create(pgType, conn);

/// <inheritdoc />

public override Type DefaultValueType => typeof(TDefault);

}

}