Introduce singletons for internal converters

src/DynamoDBGenerator/Converters/Internal/BoolConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class BoolConverter : IValueTypeConverter<bool>
+internal sealed class BoolConverter : IValueTypeConverter<bool>, IStaticSingleton<BoolConverter>
 {
     private static AttributeValue True { get; } = new() { BOOL = true };
     private static AttributeValue False { get; } = new() { BOOL = false };

src/DynamoDBGenerator/Converters/Internal/ByteConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ByteConverter : IValueTypeConverter<byte>
+internal sealed class ByteConverter : IValueTypeConverter<byte>, IStaticSingleton<ByteConverter>
 {
     public byte? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/CharConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class CharConverter : IValueTypeConverter<char>
+internal sealed class CharConverter : IValueTypeConverter<char>, IStaticSingleton<CharConverter>
 {
     public char? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/DecimalConverter.cs

@@ -1,9 +1,10 @@
 using System.Globalization;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class DecimalConverter : IValueTypeConverter<decimal>
+internal sealed class DecimalConverter : IValueTypeConverter<decimal>, IStaticSingleton<DecimalConverter>
 {
     public decimal? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/DoubleConverter.cs

@@ -1,10 +1,11 @@
 using System;
 using System.Globalization;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class DoubleConverter : IValueTypeConverter<double>
+internal sealed class DoubleConverter : IValueTypeConverter<double>, IStaticSingleton<DoubleConverter>
 {
     public double? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/FloatConverter.cs

@@ -1,9 +1,10 @@
 using System.Globalization;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class FloatConverter : IValueTypeConverter<float>
+internal sealed class FloatConverter : IValueTypeConverter<float>, IStaticSingleton<FloatConverter>
 {
     public float? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/GuidConverter.cs

@@ -1,9 +1,10 @@
 using System;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class GuidConverter : IValueTypeConverter<Guid>
+internal sealed class GuidConverter : IValueTypeConverter<Guid>, IStaticSingleton<GuidConverter>
 {
     public Guid? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ISO8601DateOnlyConverter.cs

@@ -1,9 +1,10 @@
 using System;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ISO8601DateOnlyConverter : IValueTypeConverter<DateOnly>
+internal sealed class ISO8601DateOnlyConverter : IValueTypeConverter<DateOnly>, IStaticSingleton<ISO8601DateOnlyConverter>
 {
     public DateOnly? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ISO8601DateTimeConverter.cs

@@ -1,9 +1,10 @@
 using System;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ISO8601DateTimeConverter : IValueTypeConverter<DateTime>
+internal sealed class ISO8601DateTimeConverter : IValueTypeConverter<DateTime>, IStaticSingleton<ISO8601DateTimeConverter>
 {
     public DateTime? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ISO8601DateTimeOffsetConverter.cs

@@ -1,9 +1,10 @@
 using System;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ISO8601DateTimeOffsetConverter : IValueTypeConverter<DateTimeOffset>
+internal sealed class ISO8601DateTimeOffsetConverter : IValueTypeConverter<DateTimeOffset>, IStaticSingleton<ISO8601DateTimeOffsetConverter>
 {
     public DateTimeOffset? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ISO8601TimeOnlyConverter.cs

@@ -1,9 +1,10 @@
 using System;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal class ISO8601TimeOnlyConverter: IValueTypeConverter<TimeOnly>
+internal class ISO8601TimeOnlyConverter: IValueTypeConverter<TimeOnly>, IStaticSingleton<ISO8601TimeOnlyConverter>
 {
     public TimeOnly? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ISO8601TimeSpanConverter.cs

@@ -1,10 +1,11 @@
 using System;
 using System.Xml;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ISO8601TimeSpanConverter : IValueTypeConverter<TimeSpan>
+internal sealed class ISO8601TimeSpanConverter : IValueTypeConverter<TimeSpan>, IStaticSingleton<ISO8601TimeSpanConverter>
 {
     public TimeSpan? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/Int32Converter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class Int32Converter : IValueTypeConverter<int>
+internal sealed class Int32Converter : IValueTypeConverter<int>, IStaticSingleton<Int32Converter>
 {
     public int? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/LongConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class LongConverter : IValueTypeConverter<long>
+internal sealed class LongConverter : IValueTypeConverter<long>, IStaticSingleton<LongConverter>
 {
     public long? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/MemoryStreamConverter.cs

@@ -1,9 +1,10 @@
 using System.IO;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class MemoryStreamConverter : IReferenceTypeConverter<MemoryStream>
+internal sealed class MemoryStreamConverter : IReferenceTypeConverter<MemoryStream>, IStaticSingleton<MemoryStreamConverter>
 {
     public MemoryStream? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/SByteConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class SByteConverter : IValueTypeConverter<sbyte>
+internal sealed class SByteConverter : IValueTypeConverter<sbyte>, IStaticSingleton<SByteConverter>
 {
     public sbyte? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ShortConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ShortConverter : IValueTypeConverter<short>
+internal sealed class ShortConverter : IValueTypeConverter<short>, IStaticSingleton<ShortConverter>
 {
     public short? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/StringConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class StringConverter : IReferenceTypeConverter<string>
+internal sealed class StringConverter : IReferenceTypeConverter<string>, IStaticSingleton<StringConverter>
 {
     public string? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/UIntConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class UIntConverter : IValueTypeConverter<uint>
+internal sealed class UIntConverter : IValueTypeConverter<uint>, IStaticSingleton<UIntConverter>
 {
     public uint? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/ULongConverter.cs

@@ -1,8 +1,9 @@
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class ULongConverter : IValueTypeConverter<ulong>
+internal sealed class ULongConverter : IValueTypeConverter<ulong>, IStaticSingleton<ULongConverter>
 {
     public ulong? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/Converters/Internal/UShortConverter.cs

@@ -1,8 +1,10 @@
+using System.Reflection.Metadata;
 using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Internal;
 
 namespace DynamoDBGenerator.Converters.Internal;
 
-internal sealed class UShortConverter : IValueTypeConverter<ushort>
+internal sealed class UShortConverter : IValueTypeConverter<ushort>, IStaticSingleton<UShortConverter>
 {
     public ushort? Read(AttributeValue attributeValue)
     {

src/DynamoDBGenerator/DynamoDBGenerator.csproj

@@ -4,7 +4,6 @@
         <TargetFramework>net8.0</TargetFramework>
         <Nullable>enable</Nullable>
         <IsPackable>true</IsPackable>
-        <LangVersion>10.0</LangVersion>
         <PackageVersion>0.0.0</PackageVersion>
         <Title>DynamoDBGenerator</Title>
         <Authors>Robert Andersson</Authors>

src/DynamoDBGenerator/Internal/Singleton.cs

@@ -0,0 +1,12 @@
+namespace DynamoDBGenerator.Internal;
+
+internal interface IStaticSingleton<out T> where T : new()
+{
+    private static T? _backingField;
+    internal static virtual T Singleton => _backingField ??= new T();
+}
+
+internal static class Singleton
+{
+    public static T Static<T>() where T : IStaticSingleton<T>, new() => T.Singleton;
+}