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public class Task {
/** Gets the length (number of notifications, not time length) of the task depending on the task parameter.
* @return A positive number, -1 is the task length is unknown/undefined.
*/
public int getTaskLength() {
...
}
/** Do the task.
* @param obs An optional observer that is interrested in receiving this task's notifications, may be <code>null</code>.
*/
public void doTask(TaskObserver obs) {
...
if ((obs != null) && (obs.hasBeenCanceled())) {
return;
}
if (obs != null) {
obs.stepDone();
obs.setNote("Switching to next sub task.");
}
...
}
}
/** An implementation that only holds a <code>JProgressBar</code>.
*/
public class ProgressBarTaskObserver implements TaskObserver {
private JProgressBar bar = ...
...
/** @inheritDoc
* <br>This implementation always returns <code>false</code> as we do not have a cancel button.
*/
public boolean hasBeenCanceled() {
return false;
}
/** @inheritDoc
* <br>Increments the bar.
*/
public void stepDone() {
try {
// Update at EDT and wait until update is done.
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
bar.setValue(bar.getValue()+1);
}
});
}
// Silently consume exception.
catch (Exception e) {
}
}
} |
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