io.cdap.wrangler.expression

Class EL

java.lang.Object

io.cdap.wrangler.expression.EL

public final class EL
extends Object

This class EL is a Expression Language Handler.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EL.DefaultFunctions

Method Summary

Modifier and Type	Method and Description
static EL	compile(ELRegistration registration, String expression) Compiles the given expressions and return an EL for script execution.
static EL	compile(String expression) Same as calling compile(ELRegistration, String) using EL.DefaultFunctions.
ELResult	execute(ELContext context)
static boolean	isUsed() Returns true if this class has been used to execute JEXL script.
Set<String>	variables()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isUsed

public static boolean isUsed()

Returns true if this class has been used to execute JEXL script.

compile

public static EL compile(String expression)
                  throws ELException

Same as calling compile(ELRegistration, String) using EL.DefaultFunctions.

Throws:

ELException

compile

public static EL compile(ELRegistration registration,
                         String expression)
                  throws ELException

Compiles the given expressions and return an EL for script execution.

Parameters:

registration - extra objects available for the script to use

expression - the JEXL expresion

Returns:

an EL instance

Throws:

ELException - if failed to compile the expression

variables

public Set<String> variables()

execute

public ELResult execute(ELContext context)
                 throws ELException

Throws:

ELException