javax.servlet.jsp.el
Interface VariableResolver


public interface VariableResolver

This class is used to customize the way an ExpressionEvaluator resolves variable references at evaluation time. For example, instances of this class can implement their own variable lookup mechanisms, or introduce the notion of "implicit variables" which override any other variables. An instance of this class should be passed when evaluating an expression.

An instance of this class includes the context against which resolution will happen

Since:
JSP2.0

Method Summary
 java.lang.Object resolveVariable(java.lang.String pName, java.lang.Object pContext)
          Resolves the specified variable.
 

Method Detail

resolveVariable

public java.lang.Object resolveVariable(java.lang.String pName,
                                        java.lang.Object pContext)
                                 throws ELException
Resolves the specified variable. Returns null if the variable is not found.

Parameters:
pName - the name of the variable to resolve
pContext - the context in which the variable is being resolved. The actual instance varies depending on the environment in which the Expression Evaluator is used. For example, in a JSP context, the context would normally be an instance of JspContext.
Returns:
the result of the variable resolution
Throws:
ELException - if a failure occurred while trying to resolve the given variable


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