VariableMapper (Java EE 5 SDK)

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Java EE 5 SDK

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javax.el Class VariableMapper

java.lang.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.

从以下版本开始:: JSP 2.1

构造器摘要
`VariableMapper()`

方法摘要
`abstract ValueExpression`	`resolveVariable(String variable)`
`abstract ValueExpression`	`setVariable(String variable, ValueExpression expression)` Assign a ValueExpression to an EL variable, replacing any previously assignment to the same variable.

类方法继承 java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

构造器详细信息

VariableMapper

public VariableMapper()

方法详细信息

resolveVariable

public abstract ValueExpression resolveVariable(String variable)

参数:: variable - The variable name
返回:: 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.

参数:: variable - The variable name; expression - The ValueExpression to be assigned to the variable.
返回:: The previous ValueExpression assigned to this variable, null if there is no previouse assignment to this variable.

概述