VariableMapper (Java EE 8)

java.lang.Object
- javax.el.VariableMapper

```
public abstract class VariableMapper
extends java.lang.Object
```
The interface to a map between EL variables and the EL expressions they are associated with.

Since:

JSP 2.1

Constructor Summary

Constructors
Constructor Description

VariableMapper()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract ValueExpression`	`resolveVariable(java.lang.String variable)`
`abstract ValueExpression`	`setVariable(java.lang.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
  - VariableMapper
```
public VariableMapper()
```
- Method Detail
  - resolveVariable
```
public abstract ValueExpression resolveVariable(java.lang.String variable)
```
    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(java.lang.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.