<?php

namespace League\Container\ServiceProvider;

use League\Container\ContainerAwareTrait;

abstract class AbstractServiceProvider implements ServiceProviderInterface
{
    use ContainerAwareTrait;

    /**
     * @var array
     */
    protected $provides = [];

    /**
     * {@inheritdoc}
     */
    public function provides($alias = null)
    {
        if (! is_null($alias)) {
            return (in_array($alias, $this->provides));
        }

        return $this->provides;
    }
}