ContentEntityBase::onChange

public ContentEntityBase::onChange($name)

public function onChange($name) {
  // Check if the changed name is the value of an entity key and if the value
  // of that is currently cached, if so, reset it. Exclude the bundle from
  // that check, as it ready only and must not change, unsetting it could
  // lead to recursions.
  if ($key = array_search($name, $this->getEntityType()->getKeys())) {
    if ($key != 'bundle') {
      if (isset($this->entityKeys[$key])) {
        unset($this->entityKeys[$key]);
      }
      elseif (isset($this->translatableEntityKeys[$key][$this->activeLangcode])) {
        unset($this->translatableEntityKeys[$key][$this->activeLangcode]);
      }
    }
  }

  switch ($name) {
    case $this->langcodeKey:
      if ($this->isDefaultTranslation()) {
        // Update the default internal language cache.
        $this->setDefaultLangcode();
        if (isset($this->translations[$this->defaultLangcode])) {
          $message = SafeMarkup::format('A translation already exists for the specified language (@langcode).', array('@langcode' => $this->defaultLangcode));
          throw new \InvalidArgumentException($message);
        }
        $this->updateFieldLangcodes($this->defaultLangcode);
      }
      else {
        // @todo Allow the translation language to be changed. See
        //   https://www.drupal.org/node/2443989.
        $items = $this->get($this->langcodeKey);
        if ($items->value != $this->activeLangcode) {
          $items->setValue($this->activeLangcode, FALSE);
          $message = SafeMarkup::format('The translation language cannot be changed (@langcode).', array('@langcode' => $this->activeLangcode));
          throw new \LogicException($message);
        }
      }
      break;

    case $this->defaultLangcodeKey:
      // @todo Use a standard method to make the default_langcode field
      //   read-only. See https://www.drupal.org/node/2443991.
      if (isset($this->values[$this->defaultLangcodeKey]) && $this->get($this->defaultLangcodeKey)->value != $this->isDefaultTranslation()) {
        $this->get($this->defaultLangcodeKey)->setValue($this->isDefaultTranslation(), FALSE);
        $message = SafeMarkup::format('The default translation flag cannot be changed (@langcode).', array('@langcode' => $this->activeLangcode));
        throw new \LogicException($message);
      }
      break;
  }
}