Grammar

logical returns [String logRet]
		:
			a = relational {$logRet = $a.val;}
			((AND {$logRet.concat( " AND ");} | OR {$logRet.concat(" OR ");})^ b = relational {$logRet.concat($b.val);})*
                                 	;

relational    returns [String val]
		:  STRINGVALUE ((operator)^ term)?
			{
				$val = $STRINGVALUE.text + $operator.text + $term.rhsOperand;
				System.out.println("Condition returned is: " + $val);
			}
                                 	;

term returns [String rhsOperand]
		:  QUOTEDSTRINGVALUE  {$rhsOperand = $QUOTEDSTRINGVALUE.text;}
                                 	|  NUMBERVALUE               {$rhsOperand = $NUMBERVALUE.text; }
                                 	| '(' condition ')'
                                	 ;