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PgTypeInfoResolverChainBuilder.cs
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187 lines (154 loc) · 7.26 KB
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using System;
using System.Collections;
using System.Collections.Generic;
namespace Npgsql.Internal;
struct PgTypeInfoResolverChainBuilder
{
readonly List<(Type ImplementationType, object)> _factories = [];
Action<PgTypeInfoResolverChainBuilder, List<IPgTypeInfoResolver>>? _addRangeResolvers;
Action<PgTypeInfoResolverChainBuilder, List<IPgTypeInfoResolver>>? _addMultirangeResolvers;
RangeArrayHandler _rangeArrayHandler = RangeArrayHandler.Instance;
MultirangeArrayHandler _multirangeArrayHandler = MultirangeArrayHandler.Instance;
Action<PgTypeInfoResolverChainBuilder, List<IPgTypeInfoResolver>>? _addArrayResolvers;
public PgTypeInfoResolverChainBuilder()
{
}
public void Clear() => _factories.Clear();
public void AppendResolverFactory(PgTypeInfoResolverFactory factory)
=> AddResolverFactory(factory.GetType(), factory);
public void AppendResolverFactory<T>(Func<T> factory) where T : PgTypeInfoResolverFactory
=> AddResolverFactory(typeof(T), Memoize(factory));
public void PrependResolverFactory(PgTypeInfoResolverFactory factory)
=> AddResolverFactory(factory.GetType(), factory, prepend: true);
public void PrependResolverFactory<T>(Func<T> factory) where T : PgTypeInfoResolverFactory
=> AddResolverFactory(typeof(T), Memoize(factory), prepend: true);
// Memoize the caller factory so all our actions (_addArrayResolvers etc.) call into the same instance.
static Func<PgTypeInfoResolverFactory> Memoize(Func<PgTypeInfoResolverFactory> factory)
{
PgTypeInfoResolverFactory? instance = null;
return () => instance ??= factory();
}
static PgTypeInfoResolverFactory GetInstance((Type, object Instance) factory) => factory.Instance switch
{
PgTypeInfoResolverFactory f => f,
Func<PgTypeInfoResolverFactory> f => f(),
_ => throw new ArgumentOutOfRangeException(nameof(factory), factory, null)
};
void AddResolverFactory(Type type, object factory, bool prepend = false)
{
for (var i = 0; i < _factories.Count; i++)
if (_factories[i].ImplementationType == type)
{
_factories.RemoveAt(i);
break;
}
if (prepend)
_factories.Insert(0, (type, factory));
else
_factories.Add((type, factory));
}
public void EnableRanges()
{
_addRangeResolvers ??= AddResolvers;
_rangeArrayHandler = RangeArrayHandlerImpl.Instance;
static void AddResolvers(PgTypeInfoResolverChainBuilder instance, List<IPgTypeInfoResolver> resolvers)
{
foreach (var factory in instance._factories)
if (GetInstance(factory).CreateRangeResolver() is { } resolver)
resolvers.Add(resolver);
}
}
public void EnableMultiranges()
{
_addMultirangeResolvers ??= AddResolvers;
_multirangeArrayHandler = MultirangeArrayHandlerImpl.Instance;
static void AddResolvers(PgTypeInfoResolverChainBuilder instance, List<IPgTypeInfoResolver> resolvers)
{
foreach (var factory in instance._factories)
if (GetInstance(factory).CreateMultirangeResolver() is { } resolver)
resolvers.Add(resolver);
}
}
public void EnableArrays()
{
_addArrayResolvers ??= AddResolvers;
static void AddResolvers(PgTypeInfoResolverChainBuilder instance, List<IPgTypeInfoResolver> resolvers)
{
foreach (var factory in instance._factories)
if (GetInstance(factory).CreateArrayResolver() is { } resolver)
resolvers.Add(resolver);
if (instance._addRangeResolvers is not null)
foreach (var factory in instance._factories)
if (instance._rangeArrayHandler.CreateRangeArrayResolver(GetInstance(factory)) is { } resolver)
resolvers.Add(resolver);
if (instance._addMultirangeResolvers is not null)
foreach (var factory in instance._factories)
if (instance._multirangeArrayHandler.CreateMultirangeArrayResolver(GetInstance(factory)) is { } resolver)
resolvers.Add(resolver);
}
}
public PgTypeInfoResolverChain Build(Action<List<IPgTypeInfoResolver>>? configure = null)
{
var resolvers = new List<IPgTypeInfoResolver>();
foreach (var factory in _factories)
resolvers.Add(GetInstance(factory).CreateResolver());
var instance = this;
_addRangeResolvers?.Invoke(instance, resolvers);
_addMultirangeResolvers?.Invoke(instance, resolvers);
_addArrayResolvers?.Invoke(instance, resolvers);
configure?.Invoke(resolvers);
return new(
resolvers,
rangesEnabled: _addRangeResolvers is not null,
multirangesEnabled: _addMultirangeResolvers is not null,
arraysEnabled: _addArrayResolvers is not null
);
}
class RangeArrayHandler
{
public static RangeArrayHandler Instance { get; } = new();
public virtual IPgTypeInfoResolver? CreateRangeArrayResolver(PgTypeInfoResolverFactory factory) => null;
}
sealed class RangeArrayHandlerImpl : RangeArrayHandler
{
public new static RangeArrayHandlerImpl Instance { get; } = new();
public override IPgTypeInfoResolver? CreateRangeArrayResolver(PgTypeInfoResolverFactory factory) => factory.CreateRangeArrayResolver();
}
class MultirangeArrayHandler
{
public static MultirangeArrayHandler Instance { get; } = new();
public virtual IPgTypeInfoResolver? CreateMultirangeArrayResolver(PgTypeInfoResolverFactory factory) => null;
}
sealed class MultirangeArrayHandlerImpl : MultirangeArrayHandler
{
public new static MultirangeArrayHandlerImpl Instance { get; } = new();
public override IPgTypeInfoResolver? CreateMultirangeArrayResolver(PgTypeInfoResolverFactory factory) => factory.CreateMultirangeArrayResolver();
}
}
readonly struct PgTypeInfoResolverChain : IEnumerable<IPgTypeInfoResolver>
{
[Flags]
enum EnabledFlags
{
None = 0,
Ranges = 1,
Multiranges = 2,
Arrays = 4
}
readonly EnabledFlags _enabled;
readonly List<IPgTypeInfoResolver> _resolvers;
public PgTypeInfoResolverChain(List<IPgTypeInfoResolver> resolvers, bool rangesEnabled, bool multirangesEnabled, bool arraysEnabled)
{
_enabled = rangesEnabled ? EnabledFlags.Ranges | _enabled : _enabled;
_enabled = multirangesEnabled ? EnabledFlags.Multiranges | _enabled : _enabled;
_enabled = arraysEnabled ? EnabledFlags.Arrays | _enabled : _enabled;
_resolvers = resolvers;
}
public bool RangesEnabled => _enabled.HasFlag(EnabledFlags.Ranges);
public bool MultirangesEnabled => _enabled.HasFlag(EnabledFlags.Multiranges);
public bool ArraysEnabled => _enabled.HasFlag(EnabledFlags.Arrays);
public IEnumerator<IPgTypeInfoResolver> GetEnumerator()
=> _resolvers?.GetEnumerator() ?? (IEnumerator<IPgTypeInfoResolver>)Array.Empty<IPgTypeInfoResolver>().GetEnumerator();
IEnumerator IEnumerable.GetEnumerator()
=> _resolvers?.GetEnumerator() ?? Array.Empty<IPgTypeInfoResolver>().GetEnumerator();
}