ANTLRStringStream input = new ANTLRStringStream(this.expression); // Create an input character stream from standard in
this.lexer = new RHQLLexer(input); // Create an echoLexer that feeds from that stream
CommonTokenStream tokens = new CommonTokenStream(this.lexer); // Create a stream of tokens fed by the lexer
this.parser = new RHQLParser(tokens); // Create a parser that feeds off the token stream
this.adaptor = new RHQLNodeAdaptor();
parser.setTreeAdaptor(adaptor);
}