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Package type-adapter
Short Description A type-safe package for adapting from one data type to another.
License MIT
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Informations about the package type-adapter
Type Adapter
A type-safe package for adapting from one data type to another.
Contents
- Installation
- Purpose
- Examples
- Contributing
- Changelog
- Support Me
- License
Installation
Via composer:
Purpose
Have you ever needed to convert one instance (usually a data transfer object) from one type to another? I found myself writing static constructors like:
In all honesty this is fine for a start, but it really creates tight coupling between objects in order to handle these constructor conversions. If I wanted to remove Foo entirely, I'd have to go and find every place where I called fromFoo on the Bar class! This can get even worse if the source type comes from a package; it may become critical to decouple this package from an application and yet references to it are now litered all through out my application.
This why I created the Type Adapter package. This package allows for loosely coupled, type safe conversions without static constructors. It attempts to reduce coupling and act as a communcation converter between the layers of your application. It is particularly useful in hexagonal architected, and by extension domain driven application, software design.
Examples
Taking the types from above, we could create an adapter that converts from Foo to Bar like so:
You can see a couple of things going on here. For starters, we implement the Adaptable interface defined in this package. This interface requires us to implement an adapt($resource) method and a expects() method.
The adapt method accepts in the resource, which we can type hint using a doc block comment, and then returns the converted type.
The expects method is for type safety. It defines out a validation rule for the adapt method to expect. This is what allows us type safety.
The expects method can either return a string type name or an array of strings, for variadic types.
Contributing
Please see CONTRIBUTING for details.
Changelog
Please see CHANGELOG for more information on what has changed recently.
Support Me
Hi! I'm a developer living in Vancouver, BC and boy is the housing market tough. If you wanna support me consider following me on Twitter @TBPixel, or maybe buying me a coffee. Thanks!
License
The MIT License (MIT). Please see License File for more information.
