| FilterExpressionParserConstants | Token literal values and constants. |
| FilterExpressionParser | A predicate-like syntax parser for filter expressions |
| FilterExpressionParserTokenManager | Token Manager. |
| SimpleCharStream | An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (without unicode processing). |
| Token | Describes the input token stream. |
| ParseException | This exception is thrown when parse errors are encountered. |
| TokenMgrError | Token Manager Error. |