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TypeMapperBase.cs
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133 lines (101 loc) · 5.16 KB
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using System;
using System.Collections.Generic;
using System.Reflection;
using Npgsql.TypeHandlers;
using Npgsql.TypeHandlers.CompositeHandlers;
using Npgsql.TypeHandling;
using NpgsqlTypes;
namespace Npgsql.TypeMapping
{
abstract class TypeMapperBase : INpgsqlTypeMapper
{
internal Dictionary<string, NpgsqlTypeMapping> Mappings { get; } = new();
public INpgsqlNameTranslator DefaultNameTranslator { get; }
protected TypeMapperBase(INpgsqlNameTranslator defaultNameTranslator)
{
if (defaultNameTranslator == null)
throw new ArgumentNullException(nameof(defaultNameTranslator));
DefaultNameTranslator = defaultNameTranslator;
}
#region Mapping management
public virtual INpgsqlTypeMapper AddMapping(NpgsqlTypeMapping mapping)
{
if (Mappings.ContainsKey(mapping.PgTypeName))
RemoveMapping(mapping.PgTypeName);
Mappings[mapping.PgTypeName] = mapping;
return this;
}
public virtual bool RemoveMapping(string pgTypeName) => Mappings.Remove(pgTypeName);
IEnumerable<NpgsqlTypeMapping> INpgsqlTypeMapper.Mappings => Mappings.Values;
public abstract void Reset();
#endregion Mapping management
#region Enum mapping
public INpgsqlTypeMapper MapEnum<TEnum>(string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
where TEnum : struct, Enum
{
if (pgName != null && pgName.Trim() == "")
throw new ArgumentException("pgName can't be empty", nameof(pgName));
if (nameTranslator == null)
nameTranslator = DefaultNameTranslator;
if (pgName == null)
pgName = GetPgName(typeof(TEnum), nameTranslator);
return AddMapping(new NpgsqlTypeMappingBuilder
{
PgTypeName = pgName,
ClrTypes = new[] { typeof(TEnum) },
TypeHandlerFactory = new EnumTypeHandlerFactory<TEnum>(nameTranslator)
}.Build());
}
public bool UnmapEnum<TEnum>(string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
where TEnum : struct, Enum
{
if (pgName != null && pgName.Trim() == "")
throw new ArgumentException("pgName can't be empty", nameof(pgName));
if (nameTranslator == null)
nameTranslator = DefaultNameTranslator;
if (pgName == null)
pgName = GetPgName(typeof(TEnum), nameTranslator);
return RemoveMapping(pgName);
}
#endregion Enum mapping
#region Composite mapping
public INpgsqlTypeMapper MapComposite<T>(string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
=> MapComposite(pgName, nameTranslator, typeof(T), t => new CompositeTypeHandlerFactory<T>(t));
public INpgsqlTypeMapper MapComposite(Type clrType, string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
=> MapComposite(pgName, nameTranslator, clrType, t => (NpgsqlTypeHandlerFactory)
Activator.CreateInstance(typeof(CompositeTypeHandlerFactory<>).MakeGenericType(clrType), BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, new object[] { t }, null)!);
INpgsqlTypeMapper MapComposite(string? pgName, INpgsqlNameTranslator? nameTranslator, Type type, Func<INpgsqlNameTranslator, NpgsqlTypeHandlerFactory> factory)
{
if (pgName != null && string.IsNullOrWhiteSpace(pgName))
throw new ArgumentException("pgName can't be empty.", nameof(pgName));
nameTranslator ??= DefaultNameTranslator;
pgName ??= GetPgName(type, nameTranslator);
return AddMapping(
new NpgsqlTypeMappingBuilder
{
PgTypeName = pgName,
ClrTypes = new[] { type },
TypeHandlerFactory = factory(nameTranslator),
}
.Build());
}
public bool UnmapComposite<T>(string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
=> UnmapComposite(typeof(T), pgName, nameTranslator);
public bool UnmapComposite(Type clrType, string? pgName = null, INpgsqlNameTranslator? nameTranslator = null)
{
if (pgName != null && string.IsNullOrWhiteSpace(pgName))
throw new ArgumentException("pgName can't be empty.", nameof(pgName));
nameTranslator ??= DefaultNameTranslator;
pgName ??= GetPgName(clrType, nameTranslator);
return RemoveMapping(pgName);
}
#endregion Composite mapping
#region Misc
// TODO: why does ReSharper think `GetCustomAttribute<T>` is non-nullable?
// ReSharper disable once ConstantConditionalAccessQualifier ConstantNullCoalescingCondition
private protected static string GetPgName(Type clrType, INpgsqlNameTranslator nameTranslator)
=> clrType.GetCustomAttribute<PgNameAttribute>()?.PgName
?? nameTranslator.TranslateTypeName(clrType.Name);
#endregion Misc
}
}