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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
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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.map.DbEntity;
  
  public abstract class PerEntityLoader extends AbstractLoader {
  
      PerEntityLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(adapter, config, delegate);
      }
  
      @Override
      public void load(DatabaseMetaData metaData, DbLoadDataStore map) throws SQLException {
          for(DbEntity dbEntity : map.getDbEntities()) {
              if(!shouldLoad(dbEntity)) {
                  continue;
              }
              try(ResultSet rs = getResultSet(dbEntity, metaData)) {
                  while(rs.next()) {
                      processResultSet(dbEntity, map, rs);
                  }
              } catch (SQLException ex) {
                  if(!catchException(dbEntity, ex)) {
                      throw ex;
                  }
              }
          }
      }
  
      boolean shouldLoad(DbEntity entity) {
          return true;
      }
  
      boolean catchException(DbEntity entity, SQLException ex) {
          return false;
      }
  
      abstract ResultSet getResultSet(DbEntity dbEntity, DatabaseMetaData metaData) throws SQLException;
  
      abstract void processResultSet(DbEntity dbEntity, DbLoadDataStore map, ResultSet rs) throws SQLException;
  }
  