javax.el.VariableMapper Maven / Gradle / Ivy
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package javax.el;
/**
* The interface to a map between EL variables and the EL expressions
* they are associated with.
*
* @since JSP 2.1
*/
public abstract class VariableMapper {
/**
* @param variable The variable name
* @return the ValueExpression assigned to the variable,
* null if there is no previous assignment to this variable.
*/
public abstract ValueExpression resolveVariable(
String variable);
/**
* 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.
*
* @param variable The variable name
* @param expression The ValueExpression to be assigned
* to the variable.
* @return The previous ValueExpression assigned to this variable,
* null if there is no previous assignment to this variable.
*/
public abstract ValueExpression setVariable(
String variable,
ValueExpression expression);
}