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<?php
/**
 * @file
 * Contains \Drupal\comment\CommentStorageSchema.
 */
namespace Drupal\comment;
use Drupal\Core\Entity\ContentEntityTypeInterface;
use Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
/**
 * Defines the comment schema handler.
 */
class CommentStorageSchema extends SqlContentEntityStorageSchema {
  /**
   * {@inheritdoc}
   */
  protected function getEntitySchema(ContentEntityTypeInterface $entity_type, $reset = FALSE) {
    $schema = parent::getEntitySchema($entity_type, $reset);
    $schema['comment_field_data']['indexes'] += array(
      'comment__status_pid' => array('pid', 'status'),
      'comment__num_new' => array(
        'entity_id',
        'entity_type',
        'comment_type',
        'status',
        'created',
        'cid',
        'thread',
      ),
      'comment__entity_langcode' => array(
        'entity_id',
        'entity_type',
        'comment_type',
        'default_langcode',
      ),
    );
    return $schema;
  }
  /**
   * {@inheritdoc}
   */
  protected function getSharedTableFieldSchema(FieldStorageDefinitionInterface $storage_definition, $table_name, array $column_mapping) {
    $schema = parent::getSharedTableFieldSchema($storage_definition, $table_name, $column_mapping);
    $field_name = $storage_definition->getName();
    if ($table_name == 'comment_field_data') {
      // Remove unneeded indexes.
      unset($schema['indexes']['comment_field__pid__target_id']);
      unset($schema['indexes']['comment_field__entity_id__target_id']);
      switch ($field_name) {
        case 'thread':
          // Improves the performance of the comment__num_new index defined
          // in getEntitySchema().
          $schema['fields'][$field_name]['not null'] = TRUE;
          break;
        case 'created':
          $this->addSharedTableFieldIndex($storage_definition, $schema, TRUE);
          break;
        case 'uid':
          $this->addSharedTableFieldForeignKey($storage_definition, $schema, 'users', 'uid');
      }
    }
    return $schema;
  }
}