javax.el
Class VariableMapper

Object
  javax.el.VariableMapper

public abstract class VariableMapper
extends Object

The interface to a map between EL variables and the EL expressions they are associated with.

Constructor Summary

VariableMapper()

Method Summary

abstract ValueExpression	resolveVariable(String variable) Resolves the specified variable name to a ValueExpression.
abstract ValueExpression	setVariable(String variable, ValueExpression expression) Assign a ValueExpression to an EL variable, replacing any previously assignment to the same variable.

Methods inherited from class Object

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

Constructor Detail

VariableMapper

public VariableMapper()

Method Detail

resolveVariable

public abstract ValueExpression resolveVariable(String variable)

Resolves the specified variable name to a ValueExpression.

Parameters:

variable - The variable name

Returns:

the ValueExpression assigned to the variable, null if there is no previous assignment to this variable.

setVariable

public abstract ValueExpression setVariable(String variable,
                                            ValueExpression expression)

Assign a ValueExpression to an EL variable, replacing any previously assignment to the same variable. The assignment for the variable is removed if the expression is null.

Parameters:

variable - The variable name

expression - The ValueExpression to be assigned to the variable.

Returns:

The previous ValueExpression assigned to this variable, null if there is no previous assignment to this variable.