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  package org.apache.cayenne.dbsync.reverse.dbload;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dbsync.reverse.filters.CatalogFilter;
  import org.apache.cayenne.dbsync.reverse.filters.SchemaFilter;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.dbsync.model.DetectedDbEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class EntityLoader extends PerCatalogAndSchemaLoader {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DbLoader.class);
  
      private final String[] types;
  
      EntityLoader(DbAdapter adapter, DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(adapter, config, delegate);
          types = getTableTypes();
      }
  
      @Override
      protected ResultSet getResultSet(String catalogName, String schemaName, DatabaseMetaData metaData) throws SQLException {
          return metaData.getTables(catalogName, schemaName, WILDCARD, types);
      }
  
      @Override
      protected void processResultSetRow(CatalogFilter catalog, SchemaFilter schema, DbLoadDataStore map, ResultSet rs) throws SQLException {
          String name = rs.getString("TABLE_NAME");
          String catalogName = rs.getString("TABLE_CAT");
          String schemaName = rs.getString("TABLE_SCHEM");
          String type = rs.getString("TABLE_TYPE");
  
          // Oracle 9i and newer has a nifty recycle bin feature...
          // but we don't want dropped tables to be included here;
          // in fact they may even result in errors on reverse engineering
          // as their names have special chars like "/", etc.
          // So skip them all together (it's about "name == null" check)
          if (name == null || !schema.tables.isIncludeTable(name)) {
              return;
          }
  
          if (!(catalog.name == null || catalog.name.equals(catalogName))
                  || !(schema.name == null || schema.name.equals(schemaName))) {
              LOGGER.error(catalogName + "." + schema + "." + schemaName + " wrongly loaded for catalog/schema : "
                      + catalog.name + "." + schema.name);
              return;
          }
  
          DetectedDbEntity table = new DetectedDbEntity(name);
          table.setCatalog(catalogName);
          table.setSchema(schemaName);
          table.setType(type);
          addDbEntityToMap(table, map);
      }
  
      private void addDbEntityToMap(DetectedDbEntity table, DbLoadDataStore map) {
          DbEntity oldEnt = map.addDbEntitySafe(table);
          if (oldEnt != null) {
              LOGGER.warn("Overwrite DbEntity: " + oldEnt.getName());
              delegate.dbEntityRemoved(oldEnt);
          }
          delegate.dbEntityAdded(table);
      }
  
      private String[] getTableTypes() {
          String[] configTypes = config.getTableTypes();
          String viewType = adapter.tableTypeForView();
          String tableType = adapter.tableTypeForTable();
  
          List<String> resultTableTypes = new ArrayList<>();
          if(configTypes == null || configTypes.length == 0) {
              addTypeToList(viewType, resultTableTypes);
              addTypeToList(tableType, resultTableTypes);
          } else {
              for(String type : configTypes) {
                  if(type.equalsIgnoreCase("TABLE")) {
                      addTypeToList(tableType, resultTableTypes);
                  } else if(type.equalsIgnoreCase("VIEW")) {
                      addTypeToList(viewType, resultTableTypes);
                  } else {
                      addTypeToList(type, resultTableTypes);
                  }
              }
          }
  
          return resultTableTypes.toArray(new String[0]);
      }
  
      private void addTypeToList(String type, List<String> tableTypes) {
          if(type != null) {
              tableTypes.add(type);
          }
      }
  }
  