Interface ELInterpreter

All Known Implementing Classes:

ELInterpreterFactory.DefaultELInterpreter, ELInterpreterTagSetters

public interface ELInterpreter

Defines the interface for the expression language interpreter. This allows users to provide custom EL interpreter implementations that can optimise EL processing for an application by , for example, performing code generation for simple expressions.

Method Summary

Modifier and Type	Method	Description
String	interpreterCall(JspCompilationContext context, boolean isTagFile, String expression, Class<?> expectedType, String fnmapvar)	Returns the string representing the code that will be inserted into the servlet generated for JSP.

Method Details

interpreterCall

String interpreterCall(JspCompilationContext context,
 boolean isTagFile,
 String expression,
 Class<?> expectedType,
 String fnmapvar)

Returns the string representing the code that will be inserted into the servlet generated for JSP. The default implementation creates a call to PageContextImpl.proprietaryEvaluate(String, Class, javax.servlet.jsp.PageContext, org.apache.jasper.runtime.ProtectedFunctionMapper) but other implementations may produce more optimised code.

Parameters:

context - The compilation context

isTagFile - true if in a tag file rather than a JSP

expression - a String containing zero or more "${}" expressions

expectedType - the expected type of the interpreted result

fnmapvar - Variable pointing to a function map.

Returns:

a String representing a call to the EL interpreter.