JELActivator (Starjava TOPCAT API)

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java.lang.Object
- uk.ac.starlink.topcat.JELActivator

All Implemented Interfaces:

Activator
```
public class JELActivator
extends java.lang.Object
implements Activator
```
Activator which evaluates a given JEL expression per row on activation.

Since:

20 Aug 2004

Author:

Mark Taylor (Starlink)

Field Summary
- Fields inherited from interface uk.ac.starlink.topcat.Activator
  NOP

Constructor Summary

Constructors
Constructor Description

JELActivator(TopcatModel tcModel, java.lang.String expression)
Constructs a new activator given an algebraic expression.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`activateRow(long lrow)`	Invokes some kind of action on row indicated by a given index.
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - JELActivator
```
public JELActivator(TopcatModel tcModel,
                    java.lang.String expression)
             throws gnu.jel.CompilationException
```
    Constructs a new activator given an algebraic expression.
    
    Parameters:
    
    tcModel - expression evaluation context
    
    expression - string for JEL evaluation at each row
    
    Throws:
    
    gnu.jel.CompilationException - if expression is bad
- Method Detail
  - activateRow
```
public java.lang.String activateRow(long lrow)
```
    Description copied from interface: Activator
    
    Invokes some kind of action on row indicated by a given index. If the return value is non-null it is treated as some kind of message which may be conveyed to the user.
    
    Specified by:
    
    activateRow in interface Activator
    
    Parameters:
    
    lrow - row index to activate
    
    Returns:
    
    true iff the activation was successful
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object

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