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## javax.el
Class VariableMapper

    java.lang.Object
      javax.el.VariableMapper

Direct Known Subclasses:
  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.

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

### VariableMapper

    public VariableMapper()

Method Detail

### 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.

### 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.

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