/**
* Get the children of the specified container. If the container is lazy and dirty the returned
* array will contain only one element, i.e. a {@link ProgressRunner} that is used to monitor the
* progress of the children fetching operation that will be started immediately by this method.
*
* @param container The container from which to fetch the children.
* @return An array containing either the list of children or a {@link ProgressRunner} object.
*/
protected Object[] getChildren(final IGridContainer container) {
Object[] children = null;
if (container.isLazy() && container.isDirty()) {
ProgressTreeNode monitor = this.progressNodes.get(container);
if (monitor == null) {
FetchChildrenJob fetcher =
new FetchChildrenJob(container, this.treeViewer.getControl().getShell());
monitor = new ProgressTreeNode(this.treeViewer);
this.progressNodes.put(container, monitor);
fetcher.setExternalMonitor(monitor);
fetcher.setSystem(true);
fetcher.schedule();
}
children = new Object[] {monitor};
} else {
this.progressNodes.remove(container);
try {
IGridElement[] childElements = container.getChildren(null);
List<IGridElement> visibleChildren = new ArrayList<IGridElement>();
for (IGridElement child : childElements) {
if (!child.isHidden()) {
visibleChildren.add(child);
}
}
children = visibleChildren.toArray(new IGridElement[visibleChildren.size()]);
} catch (ProblemException pExc) {
if (this.treeViewer != null) {
Shell shell = this.treeViewer.getControl().getShell();
ProblemDialog.openProblem(
shell,
Messages.getString("GridModelContentProvider.problem_title"), // $NON-NLS-1$
Messages.getString("GridModelContentProvider.problem_text")
+ container.getName(), // $NON-NLS-1$
pExc);
} else {
Activator.logException(pExc);
}
}
}
return children;
}
@Override
public boolean canContain(final IGridElement element) {
return IGridApplication.class.isAssignableFrom(element.getClass())
|| ContainerMarker.class.isAssignableFrom(element.getClass());
}