private function loadClassesFromYaml()
{
if (null === $this->yamlParser) {
$this->yamlParser = new YamlParser();
}
$this->classes = $this->parseFile($this->file);
if (isset($this->classes['namespaces'])) {
foreach ($this->classes['namespaces'] as $alias => $namespace) {
$this->addNamespaceAlias($alias, $namespace);
}
unset($this->classes['namespaces']);
}
}