gush-adapter-example.php

<?php

class AdapterFactory
{
    private $adapters = [];

    public function registerAdapter($name, callback $adapterFactory, callback $adapterConfigurator
    {
        $this->adapter[$adapter] = [$adapterFactory, $adapterConfigurator];
    }
    
    public function createAdapter($adapter, array $config)
    {
        return $this->adapter[$adapter][0]($config);
    }    
    
    public function createAdapterConfiguration($adapter, Output $output, DialogHelper $dialogHelper, )
    {
        return $this->adapter[$adapter][1]($output, $dialogHelper);
    }
}

class Application
{
    //AdapterFactory
    private $factory = null;

    // configured/availible adapters (aka config-slots)
    private $adapters = [];
    
    private $currentAdapter = null;   
    
    /*
    $adapters = [
        'my_adapter' => [
            'adapter_name' => 'github',
            'instance' => {GitHubAdapter object} or null
            'config' => [...]
        ]
    ];
    */
    
    public function setCurrentAdapter($adapter)
    {
        $this->currentAdapter = $adapter;
    }
    
    public function setAdapter($name, $adapter, array $config)
    {
        $this->adapters[$name] = [
            'adapter_name' => 'github',
            'instance' => null,
            'config' => $config,
        ];
    }
    
    public function getAdapter($name=null)
    {
        $name = $name :? $this->currentAdapter;
    
        if (null === $this->adapters[$name]['instance']) {
            $this->adapters[$name]['instance'] = $this->factory->createAdapter(
                $this->adapters[$name]['adapter_name'],
                $this->adapters[$name]['config'],            
            );
        }
        
        return $this->adapters[$name]['instance'];
    }
}

$factory = new AdapterFactory();
$factory->registerAdapter(
    'github',
    function ($config) { return new GitHubAdapter($config); },
    function ($config) { return new DefaultConfigurator($output, $dialogHelper, 'GitHub', url='https://api.github.com/', supportTokens=true); }
);

$config = new Config();
$application = new Application($factory, $config);

foreach ($config->get('adapters') as $slotName => $slot) {
    $application->setAdapter($slotName, $slot['adapter_name'], $slot['config']);
}

$application->setCurrentAdapter($config->get('default_adapter'));