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  package org.apache.cayenne.dbsync.reverse.dbload;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dbsync.reverse.filters.PatternFilter;
  import org.apache.cayenne.map.DbEntity;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  
  /**
   * Attribute loader that goes on per-entity level in case {@link AttributeLoader} has failed for some reason.
   * @since 5.0
   */
  class FallbackAttributeLoader extends PerEntityLoader {
  
      private final AttributeProcessor attributeProcessor;
  
      FallbackAttributeLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(adapter, config, delegate);
          this.attributeProcessor = new AttributeProcessor(adapter);
      }
  
      @Override
      ResultSet getResultSet(DbEntity dbEntity, DatabaseMetaData metaData) throws SQLException {
          return metaData.getColumns(dbEntity.getCatalog(), dbEntity.getSchema(), dbEntity.getName(), WILDCARD);
      }
  
      @Override
      boolean shouldLoad(DbEntity entity) {
          return entity.getAttributes().size() == 0;
      }
  
      @Override
      void processResultSet(DbEntity dbEntity, DbLoadDataStore map, ResultSet rs) throws SQLException {
          PatternFilter columnFilter = config.getFiltersConfig()
                  .tableFilter(dbEntity.getCatalog(), dbEntity.getSchema())
                  .getIncludeTableColumnFilter(dbEntity.getName());
  
          attributeProcessor.processAttribute(rs, columnFilter, dbEntity);
      }
  }
  