Decorator.php

<?php

namespace Drupal\webprofiler;


/**
 * Generic class Decorator.
 */
class Decorator {
    
    /**
     * @var
     */
    protected $object;
    
    /**
     * Class constructor.
     *
     * @param object $object
     *   The object to decorate.
     */
    public function __construct($object) {
        $this->object = $object;
    }
    
    /**
     * Return the original (i.e. non decorated) object.
     *
     * @return mixed
     *   The original object.
     */
    public function getOriginalObject() {
        $object = $this->object;
        while ($object instanceof Decorator) {
            $object = $object->getOriginalObject();
        }
        return $object;
    }
    
    /**
     * Returns true if $method is a PHP callable.
     *
     * @param string $method
     *   The method name.
     * @param bool $checkSelf
     *
     * @return bool|mixed
     */
    public function isCallable($method, $checkSelf = FALSE) {
        
        //Check the original object
        $object = $this->getOriginalObject();
        if (is_callable([
            $object,
            $method,
        ])) {
            return $object;
        }
        // Check Decorators.
        $object = $checkSelf ? $this : $this->object;
        while ($object instanceof Decorator) {
            if (is_callable([
                $object,
                $method,
            ])) {
                return $object;
            }
            $object = $this->object;
        }
        return FALSE;
    }
    
    /**
     * @param $method
     * @param $args
     *
     * @return mixed
     *
     * @throws \Exception
     */
    public function __call($method, $args) {
        if ($object = $this->isCallable($method)) {
            return call_user_func_array([
                $object,
                $method,
            ], $args);
        }
        throw new \Exception('Undefined method - ' . get_class($this->getOriginalObject()) . '::' . $method);
    }
    
    /**
     * @param $property
     *
     * @return null
     */
    public function __get($property) {
        $object = $this->getOriginalObject();
        if (property_exists($object, $property)) {
            return $object->{$property};
        }
        return NULL;
    }

}