org.springframework.binding.expression
Interface ExpressionParser

All Known Implementing Classes:

AbstractExpressionParser, BeanWrapperExpressionParser, OgnlExpressionParser

public interface ExpressionParser

Parses expression strings, returing a configured evaluator instance capable of performing parsed expression evaluation in a thread safe way.

Author:

Keith Donald

Method Summary

boolean	isDelimitedExpression(java.lang.String expressionString) Is this expression string delimited in a manner that indicates it is a parseable expression? For example "${expression}".
Expression	parseExpression(java.lang.String expressionString) Parse the provided expression string, returning an evaluator capable of evaluating it against input.
SettableExpression	parseSettableExpression(java.lang.String expressionString) Parse the provided settable expression string, returning an evaluator capable of evaluating its value as well as setting its value.

Method Detail

isDelimitedExpression

boolean isDelimitedExpression(java.lang.String expressionString)

Is this expression string delimited in a manner that indicates it is a parseable expression? For example "${expression}".

Parameters:

expressionString - the proposed expression string

Returns:

true if yes, false if not

parseExpression

Expression parseExpression(java.lang.String expressionString)
                           throws ParserException

Parse the provided expression string, returning an evaluator capable of evaluating it against input.

Parameters:

expressionString - the parseable expression string

Returns:

the evaluator for the parsed expression

Throws:

ParserException - an exception occured during parsing

parseSettableExpression

SettableExpression parseSettableExpression(java.lang.String expressionString)
                                           throws ParserException,
                                                  java.lang.UnsupportedOperationException

Parse the provided settable expression string, returning an evaluator capable of evaluating its value as well as setting its value.

Parameters:

expressionString - the parseable expression string

Returns:

the evaluator for the parsed expression

Throws:

ParserException - an exception occured during parsing

java.lang.UnsupportedOperationException - this parser does not support settable expressions