org.springframework.binding.expression.support
Class AbstractExpressionParser

java.lang.Object
  org.springframework.binding.expression.support.AbstractExpressionParser

All Implemented Interfaces:

ExpressionParser

Direct Known Subclasses:

BeanWrapperExpressionParser, OgnlExpressionParser

public abstract class AbstractExpressionParser
extends java.lang.Object
implements ExpressionParser

Abstract base class for expression parsers.

Author:

Keith Donald, Erwin Vervaet

Constructor Summary

AbstractExpressionParser()

Method Summary

protected abstract Expression	doParseExpression(java.lang.String expressionString) Template method for parsing a filtered expression string.
protected abstract SettableExpression	doParseSettableExpression(java.lang.String expressionString) Template method for parsing a filtered settable expression string.
java.lang.String	getExpressionPrefix() Returns the configured expression delimiter prefix.
java.lang.String	getExpressionSuffix() Returns the expression delimiter suffix.
boolean	isDelimitedExpression(java.lang.String expressionString) Check whether or not given criteria are expressed as an 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.
void	setExpressionPrefix(java.lang.String expressionPrefix) Sets the expression delimiter prefix.
void	setExpressionSuffix(java.lang.String expressionSuffix) Sets the expression delimiter suffix.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractExpressionParser

public AbstractExpressionParser()

Method Detail

getExpressionPrefix

public java.lang.String getExpressionPrefix()

Returns the configured expression delimiter prefix. Defaults to "${".

setExpressionPrefix

public void setExpressionPrefix(java.lang.String expressionPrefix)

Sets the expression delimiter prefix.

getExpressionSuffix

public java.lang.String getExpressionSuffix()

Returns the expression delimiter suffix. Defaults to "}".

setExpressionSuffix

public void setExpressionSuffix(java.lang.String expressionSuffix)

Sets the expression delimiter suffix.

isDelimitedExpression

public boolean isDelimitedExpression(java.lang.String expressionString)

Check whether or not given criteria are expressed as an expression.

Specified by:

isDelimitedExpression in interface ExpressionParser

Parameters:

expressionString - the proposed expression string

Returns:

true if yes, false if not

parseExpression

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

Description copied from interface: ExpressionParser

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

Specified by:

parseExpression in interface ExpressionParser

Parameters:

expressionString - the parseable expression string

Returns:

the evaluator for the parsed expression

Throws:

ParserException - an exception occured during parsing

parseSettableExpression

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

Description copied from interface: ExpressionParser

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

Specified by:

parseSettableExpression in interface ExpressionParser

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

doParseExpression

protected abstract Expression doParseExpression(java.lang.String expressionString)
                                         throws ParserException

Template method for parsing a filtered expression string. Subclasses should override.

Parameters:

expressionString - the expression string

Returns:

the parsed expression

Throws:

ParserException - an exception occured during parsing

doParseSettableExpression

protected abstract SettableExpression doParseSettableExpression(java.lang.String expressionString)
                                                         throws ParserException,
                                                                java.lang.UnsupportedOperationException

Template method for parsing a filtered settable expression string. Subclasses should override.

Parameters:

expressionString - the expression string

Returns:

the parsed expression

Throws:

ParserException - an exception occured during parsing

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