class GenericEvent

class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate {
    
    /**
     * Encapsulate an event with $subject and $arguments.
     *
     * @param mixed $subject   The subject of the event, usually an object or a callable
     * @param array $arguments Arguments to store in the event
     */
    public function __construct(mixed $subject = null, array $arguments = []) {
    }
    
    /**
     * Getter for subject property.
     */
    public function getSubject() : mixed {
        return $this->subject;
    }
    
    /**
     * Get argument by key.
     *
     * @throws \InvalidArgumentException if key is not found
     */
    public function getArgument(string $key) : mixed {
        if ($this->hasArgument($key)) {
            return $this->arguments[$key];
        }
        throw new \InvalidArgumentException(\sprintf('Argument "%s" not found.', $key));
    }
    
    /**
     * Add argument to event.
     *
     * @return $this
     */
    public function setArgument(string $key, mixed $value) : static {
        $this->arguments[$key] = $value;
        return $this;
    }
    
    /**
     * Getter for all arguments.
     */
    public function getArguments() : array {
        return $this->arguments;
    }
    
    /**
     * Set args property.
     *
     * @return $this
     */
    public function setArguments(array $args = []) : static {
        $this->arguments = $args;
        return $this;
    }
    
    /**
     * Has argument.
     */
    public function hasArgument(string $key) : bool {
        return \array_key_exists($key, $this->arguments);
    }
    
    /**
     * ArrayAccess for argument getter.
     *
     * @param string $key Array key
     *
     * @throws \InvalidArgumentException if key does not exist in $this->args
     */
    public function offsetGet(mixed $key) : mixed {
        return $this->getArgument($key);
    }
    
    /**
     * ArrayAccess for argument setter.
     *
     * @param string $key Array key to set
     */
    public function offsetSet(mixed $key, mixed $value) : void {
        $this->setArgument($key, $value);
    }
    
    /**
     * ArrayAccess for unset argument.
     *
     * @param string $key Array key
     */
    public function offsetUnset(mixed $key) : void {
        if ($this->hasArgument($key)) {
            unset($this->arguments[$key]);
        }
    }
    
    /**
     * ArrayAccess has argument.
     *
     * @param string $key Array key
     */
    public function offsetExists(mixed $key) : bool {
        return $this->hasArgument($key);
    }
    
    /**
     * IteratorAggregate for iterating over the object like an array.
     *
     * @return \ArrayIterator<string, mixed>
     */
    public function getIterator() : \ArrayIterator {
        return new \ArrayIterator($this->arguments);
    }

}