Interface ELInterpreter

java/org/apache/jasper/compiler/ELInterpreter.java:26–44

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.

 * simple expressions.
 */
public interface ELInterpreter {

    /**
     * Returns the string representing the code that will be inserted into the servlet generated for JSP. The default
     * implementation creates a call to
     * {@link org.apache.jasper.runtime.PageContextImpl#proprietaryEvaluate( String, Class, jakarta.servlet.jsp.PageContext, org.apache.jasper.runtime.ProtectedFunctionMapper)}
     * but other implementations may produce more optimised code.
     *
     * @param context      The compilation context
     * @param isTagFile    <code>true</code> if in a tag file rather than a JSP
     * @param expression   a String containing zero or more "${}" expressions
     * @param expectedType the expected type of the interpreted result
     * @param fnmapvar     Variable pointing to a function map.
     *
     * @return a String representing a call to the EL interpreter.
     */
    String interpreterCall(JspCompilationContext context, boolean isTagFile, String expression, Class<?> expectedType,
            String fnmapvar);
}