public function setParam($key, $value = null)
    {
        if (!$this->hasParam($key)) {
            throw new \InvalidArgumentException(sprintf('Cannot set %s as parameter cause this key does not exist.', $key));
        }

        if (is_object($value)) {
            throw new \InvalidArgumentException('Parameter\'s value cannot be type of object.');
        }

        $currentValue = $this->getParamValue($key);
        if (
            (null !== $value && null !== $currentValue)
            && (
                gettype($value) !== gettype($currentValue)
                && (
                    !(is_string($value) || is_integer($value))
                    || !(is_string($currentValue) || is_integer($currentValue))
                )
            )
        ) {
            throw new \InvalidArgumentException(sprintf(
                'Cannot replace %s\'s value, %s expected and %s given.',
                $key,
                gettype($currentValue),
                gettype($value)
            ));
        }

        if (null === $value) {
            unset($this->_parameters[$key]);
        } else {
            $this->_parameters[$key] = ['value' => $value];
        }

        return $this->getContentInstance();
    }