code: package it.unibz.inf.ontop.dbschema.impl;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.inject.assistedinject.Assisted;
  import com.google.inject.assistedinject.AssistedInject;
  import it.unibz.inf.ontop.dbschema.RelationID;
  import it.unibz.inf.ontop.exception.MetadataExtractionException;
  import it.unibz.inf.ontop.injection.CoreSingletons;
  
  import java.sql.Connection;
  
  public class JTDSDBMetadataProvider extends DefaultSchemaCatalogDBMetadataProvider {
  
      @AssistedInject
      JTDSDBMetadataProvider(@Assisted Connection connection, CoreSingletons coreSingletons) throws MetadataExtractionException {
          super(connection, metadata -> new SQLServerQuotedIDFactory(), coreSingletons,
                  "SELECT DB_NAME() AS TABLE_CAT, SCHEMA_NAME() AS TABLE_SCHEM");
          // jTDS driver does not properly implement .getSchema() - it throws an exception (unimplemented method)
          // https://msdn.microsoft.com/en-us/library/ms175068.aspx
          // https://docs.microsoft.com/en-us/sql/t-sql/functions/schema-name-transact-sql
          // https://docs.microsoft.com/en-us/sql/t-sql/functions/db-name-transact-sql
      }
  
      private static final ImmutableSet<String> IGNORED_SCHEMAS = ImmutableSet.of("sys", "INFORMATION_SCHEMA");
  
      @Override
      protected boolean isRelationExcluded(RelationID id) {
          return IGNORED_SCHEMAS.contains(getRelationSchema(id));
      }
  }
  