Specification Generator

The Specification generator turns annotated static rule methods into a named SpecificationRegistry<TCandidate> factory.

Usage

using PatternKit.Generators.Specification;

[GenerateSpecificationRegistry(typeof(LoanApplication), FactoryMethodName = "Build")]
public static partial class LoanApprovalRules
{
    [SpecificationRule("verified-identity")]
    private static bool VerifiedIdentity(LoanApplication application)
        => application.HasVerifiedIdentity;
}

Generated output:

var registry = LoanApprovalRules.Build();
var approved = registry.IsSatisfiedBy("verified-identity", application);

Rule Shape

Specification rules must be static methods with this shape:

static bool Rule(TCandidate candidate)

Rule names must be unique within the generated registry.

Diagnostics

ID	Meaning
PKSPEC001	Host type must be partial.
PKSPEC002	Host type has no [SpecificationRule] methods.
PKSPEC003	Rule method signature is invalid.
PKSPEC004	Rule name is duplicated.

Dependency Injection

services.AddSingleton(_ => LoanApprovalRules.Build());
services.AddSingleton<LoanApprovalService>();

Use generated registries when teams want a stable, named rule surface that can be injected into existing ASP.NET Core or Generic Host applications.