VariableMapper (Java EE 5)

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javax.el Class VariableMapper

java.lang.Object
  javax.el.VariableMapper

public abstract class VariableMapper
extends Object

在 EL 变量及其关联的 EL 表达式之间进行映射的接口。

since

JSP 2.1

英文文档：

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

Since:: JSP 2.1

Constructor Summary
`VariableMapper()`

Method Summary
`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.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

public VariableMapper()

英文文档：
VariableMapper

public VariableMapper()

Method Detail

abstract public ValueExpression resolveVariable(String variable)

variable 变量名称

return 分配给变量的 ValueExpression；如果此变量以前没有分配值，则返回 null。

英文文档：
resolveVariable

public abstract ValueExpression resolveVariable(String variable)

Parameters:: variable - The variable name
Returns:: the ValueExpression assigned to the variable, null if there is no previous assignment to this variable.

abstract public ValueExpression setVariable(String variable, ValueExpression expression)
将 ValueExpression 分配给 EL 变量，替换以前分配给该变量的任何值。如果表达式为 `null`，则删除分配给该变量的值。

variable 变量名称

expression 将分配给变量的 ValueExpression。

return 以前分配给此变量的 ValueExpression；如果此变量以前没有分配值，则返回 null。

英文文档：
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 previouse assignment to this variable.