javax.el
类 VariableMapper

java.lang.Object
  javax.el.VariableMapper

直接已知子类：

VariableMapperFactory, VariableMapperImpl, VariableMapperImpl

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

构造方法摘要

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.

从类 java.lang.Object 继承的方法

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

构造方法详细信息

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.