@Override public ValidationErrors validate(final Database database) { final ValidationErrors validationErrors; if ((database instanceof DerbyDatabase || database instanceof H2Database) && getTableName() == null) { validationErrors = new ValidationErrors(); validationErrors.addError("tableName is required for " + database.getDatabaseProductName()); } else { final IndexExistsPrecondition precondition = new IndexExistsPrecondition(); precondition.setCatalogName(getCatalogName()); precondition.setSchemaName(getSchemaName()); precondition.setTableName(getTableName()); precondition.setIndexName(getIndexName()); precondition.setColumnNames(getColumnNames()); validationErrors = precondition.validate(database); } return validationErrors; }