Introduction

The Streams Platform provides a powerful value handler pattern that let's you defer the value or handling of something to a handler class. The resolver service makes it easy to resolve the value from such handlers.

The resolver is usually used in other parts of the system so it's helpful to understand how it works even though you may not use it directly.

Handlers are used heavily in the build process for UI builders.

Handlers

Handlers is a generic term for a class that handles the value for an attribute that has an setter or mutator method like setFoo.

Where a typical attribute in an array might look like:

$array = [
    'example' => 'Test',
];

A value handler for example might look like this:

$array = [
    'example' => \Example\TestHandler::class,
];

In the above example the method is assumed handle but you can define your own:

$array = [
    'example' => `Example\[email protected]`,
];

Basic Usage

To start resolving values in your own class you need to include the \Anomaly\Streams\Platform\Support\Resolver class.

resolve

$resolver = app(\Anomaly\Streams\Platform\Support\Resolver::class);

$resolver->resolve($target, array $arguments = [], array $options = []);

The resolve method recursively resolves values within the target value. The target is called through the Service Container and supports class and method injection.

The arguments will be available for injection as well.

$resolver = app(\Anomaly\Streams\Platform\Support\Resolver::class);

$resolver->resolve('Example\[email protected]', compact('entry'));

A simple handler might look something like this:

<?php namespace Example;

class Test
{
    public function value($entry)
    {
        return ucfirst($entry->name);
    }
}