public static Executor GetInstance(string databaseName = Constants.FILE_NAME)
{
if (_instance == null)
{
lock (_lockObject)
{
if (databaseName != null)
{
if (!File.Exists(databaseName))
{
using (File.Create(databaseName));
}
}
var updateParser = new UpdateParser();
var stringParser = new StringParser();
var reader = new Reader();
var writer = new Writer(reader);
var lockManager = new LockManager(writer, reader);
var schemaFetcher = new SchemaFetcher(reader);
var selectParser = new SelectParser();
var insertParser = new InsertParser(schemaFetcher);
var generalParser = new GeneralParser();
var createParser = new CreateParser();
var predicateParser = new PredicateParser();
var interpreter = new Interpreter(
selectParser,
insertParser,
updateParser,
schemaFetcher,
generalParser,
createParser,
stringParser,
lockManager,
reader,
predicateParser);
_instance = new Executor(interpreter);
}
}
return(_instance);
}
public Interpreter(SelectParser selectParser,
InsertParser insertParser,
UpdateParser updateParser,
SchemaFetcher schemaFetcher,
GeneralParser generalParser,
CreateParser createParser,
StringParser stringParser,
LockManager lockManager,
Reader reader,
PredicateParser predicateParser)
{
_selectParser = selectParser;
_insertParser = insertParser;
_updateParser = updateParser;
_schemaFetcher = schemaFetcher;
_generalParser = generalParser;
_createParser = createParser;
_stringParser = stringParser;
_lockManager = lockManager;
_reader = reader;
_predicateParser = predicateParser;
}
