org.jadice.util.glazedlists.calculation

Interface Calculation<N>

All Known Implementing Classes:

AbstractCalculation, AbstractCompositeCalculation, AbstractEventListCalculation

public interface Calculation<N>

It is sometimes desirable to compute single values from an entire List of objects. For example, an EventList may represent the ages of all customers and it is useful to display the average age of all customers. The average can be modeled as a Calculation which is updated as the contents of the EventList change and in turn broadcast PropertyChangeEvents to registered listeners describing a change in the calculated value.

In this way, Calculation object represent a continuation of data transformation from the domain of Lists to the domain of simple Number objects calculated from the elements of those Lists.

Author:

James Lemieux

Method Summary

Modifier and Type	Method and Description
void	addPropertyChangeListener(PropertyChangeListener pcl)
void	dispose() Cease the updating of this Calculation from its data sources and free them for garbage collection.
String	getName()
N	getValue()
void	removePropertyChangeListener(PropertyChangeListener pcl)
void	setName(String name) Adjusts the Calculation to have the new name;

Method Detail

addPropertyChangeListener

void addPropertyChangeListener(PropertyChangeListener pcl)

Parameters:

pcl - a PropertyChangeListener to notify any time the value changes

removePropertyChangeListener

void removePropertyChangeListener(PropertyChangeListener pcl)

Parameters:

pcl - a PropertyChangeListener which should no longer be notified of value changes

getName

String getName()

Returns:

a human readable name for this Calculation

setName

void setName(String name)

Adjusts the Calculation to have the new name;

Parameters:

name - the new human-readable name of this Calculation

getValue

N getValue()

Returns:

the latest calculated value

dispose

void dispose()

Cease the updating of this Calculation from its data sources and free them for garbage collection.