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  package org.apache.cayenne.dbsync.reverse.dbload;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dbsync.reverse.filters.CatalogFilter;
  import org.apache.cayenne.dbsync.reverse.filters.SchemaFilter;
  
  public abstract class PerCatalogAndSchemaLoader extends AbstractLoader {
  
      PerCatalogAndSchemaLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(adapter, config, delegate);
      }
  
      public void load(DatabaseMetaData metaData, DbLoadDataStore map) throws SQLException {
          for (CatalogFilter catalog : config.getFiltersConfig().getCatalogs()) {
              for (SchemaFilter schema : catalog.schemas) {
                  if(!shouldLoad(catalog, schema)) {
                      continue;
                  }
                  try (ResultSet rs = getResultSet(catalog.name, schema.name, metaData)) {
                      while (rs.next()) {
                          processResultSetRow(catalog, schema, map, rs);
                      }
                  } catch (SQLException ex) {
                      if(!catchException(catalog.name, schema.name, ex)) {
                          throw ex;
                      }
                  }
              }
          }
      }
  
      boolean catchException(String catalogName, String schemaName, SQLException ex) {
          return false;
      }
  
      boolean shouldLoad(CatalogFilter catalog, SchemaFilter schema) {
          return true;
      }
  
      abstract ResultSet getResultSet(String catalogName, String schemaName, DatabaseMetaData metaData) throws SQLException;
  
      abstract void processResultSetRow(CatalogFilter catalog, SchemaFilter schema, DbLoadDataStore map, ResultSet rs) throws SQLException;
  }
  