ParamChangeEvent (SNAP Engine API)

java.lang.Object
- java.util.EventObject
- - org.esa.snap.core.param.ParamChangeEvent

All Implemented Interfaces:

Serializable
```
public class ParamChangeEvent
extends EventObject
```
A ParamChangeEvent occurs when the value of parameter has changed.

Version:

$Revision$ $Date$

See Also:

Parameter, Serialized Form

Field Summary
- Fields inherited from class java.util.EventObject
  source

Constructor Summary

Constructors
Constructor	Description
`ParamChangeEvent(Object source, Parameter parameter, Object oldValue)`	Constructs a new event for the given source, parameter and the parameter's old value.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`getOldValue()`	Returns the parameter's old value.
`Parameter`	`getParameter()`	Returns the parameter whose value changed.

Methods inherited from class java.util.EventObject
getSource, toString

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

- Constructor Detail
  - ParamChangeEvent
```
public ParamChangeEvent(Object source,
                        Parameter parameter,
                        Object oldValue)
```
    Constructs a new event for the given source, parameter and the parameter's old value.
    
    Parameters:
    
    source - the source which fired this event
    
    parameter - the parameter whose value changed
    
    oldValue - the parameter's old value
- Method Detail
  - getParameter
```
public Parameter getParameter()
```
    Returns the parameter whose value changed.
  - getOldValue
```
public Object getOldValue()
```
    Returns the parameter's old value.