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  package org.apache.cayenne.unit.di.runtime;
  
  import org.apache.cayenne.configuration.ConfigurationTree;
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.xml.XMLDataChannelDescriptorLoader;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.di.Injector;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.resource.URLResource;
  import org.apache.cayenne.unit.UnitDbAdapter;
  
  import java.net.URL;
  import java.sql.SQLException;
  import java.util.List;
  
  public class DBCleaner {
  
      private FlavoredDBHelper dbHelper;
      private String location;
  
      @Inject
      private SchemaBuilder schemaBuilder;
  
      @Inject
      private UnitDbAdapter accessStackAdapter;
  
      @Inject
      private Injector injector;
  
      public DBCleaner(FlavoredDBHelper dbHelper, String location) {
          this.dbHelper = dbHelper;
          this.location = location;
      }
  
      public void clean() throws SQLException {
          XMLDataChannelDescriptorLoader loader = new XMLDataChannelDescriptorLoader();
          injector.injectMembers(loader);
  
          URL url = getClass().getClassLoader().getResource(location);
          ConfigurationTree<DataChannelDescriptor> tree = loader.load(new URLResource(url));
  
          for (DataMap map : tree.getRootNode().getDataMaps()) {
              List<DbEntity> entities = schemaBuilder.dbEntitiesInDeleteOrder(map);
  
              for (DbEntity entity : entities) {
                  dbHelper.deleteAll(entity.getName());
              }
          }
      }
  }
  