The workpiece assumes responsibility for saving or not, depending on its state.
- By Kevlin Henney
- July 17, 2000
Patterns in Java
Collections for States
Kevlin Henney
Listing 3. The workpiece assumes responsibility for saving or not, depending on its state.
public abstract class Workpiece
{
public void save()
{
if(changed)
{
saveState();
changed = false;
}
}
...
}
public class Application
{
public void saveChanges()
{
Iterator workpiece = changed.iterator();
while(workpiece.hasNext())
((Workpiece) workpiece.next()).save();
}
...
}
About the Author
Kevlin Henney is a Principal Technologist with QA Training in the UK.