// Return a list of tables identifiers involved in the specified schema // @param schemaId schema identifier // @return a Set of table identifiers; if the schema is not found the set will be empty public HashSet <String> getInvolvedTables(String schemaId) { HashSet <String> tables = new HashSet <String>(); StagingSchema schema = getSchema(schemaId); if (schema != null && schema.getInvolvedTables() != null) { tables = schema.getInvolvedTables(); } return(tables); }