protected function renderVersion(Version $version, $previous, $callback = null, $force = false)
{
if (null === $this->renderer) {
throw new \LogicException('You must set a renderer.');
}
$frozen = $version->isFrozen() && $this->renderer->isRendered($this) && $this->version === file_get_contents($this->getBuildDir() . '/PROJECT_VERSION');
if ($force && !$frozen) {
$this->flushDir($this->getBuildDir());
}
if ($previous && !$this->renderer->isRendered($this)) {
$this->seedCache($previous, $this->getBuildDir());
}
$diff = $this->renderer->render($this, $callback);
if (null !== $callback) {
call_user_func($callback, Message::RENDER_VERSION_FINISHED, $diff);
}
}
