code: public Object evaluate(Object pContext,
                             VariableResolver pResolver,
                             Map functions,
                             String defaultPrefix,
                             Logger pLogger)
              throws ELException {
          if (pResolver == null) {
              return null;
          } else {
              return pResolver.resolveVariable(mName, pContext);
          }
      }
docs: Evaluates by looking up the name in the VariableResolver