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Code Issues Wiki Activity

[204684] CheckExistsJob used for determining if a remote object exists after a query of it's children

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This commit is contained in:
David McKnight 2007-09-26 20:43:30 +00:00
parent 954dc9c537
commit 04da14a895
1 changed files with 127 additions and 8 deletions
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135
rse/plugins/org.eclipse.rse.ui/UI/org/eclipse/rse/internal/ui/view/SystemView.java
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@ -41,6 +41,7 @@
* Kevin Doyle (IBM) - [196582] Deprecated getRemoteObjectIdentifier
* Martin Oberhuber (Wind River) - [198650] Fix assertion when restoring workbench state
* Martin Oberhuber (Wind River) - [183176] Fix "widget is disposed" during Platform shutdown
* David McKnight (IBM) - [204684] CheckExistsJob used for determining if a remote object exists after a query of it's children
********************************************************************************/
package org.eclipse.rse.internal.ui.view;
@ -170,6 +171,7 @@ import org.eclipse.swt.events.TreeEvent;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Shell;
@ -5738,6 +5740,103 @@ public class SystemView extends SafeTreeViewer
}
*/
/**
* For bug 204684:
*
* Because we don't have an API for ISystemViewElementAdapter.exists()...
* This class is used to determine whether an object exists and consequently whether to remove it from the view
* after a query comes back with either no children or a SystemMessageObject. We query the parent to determine
* whether the remote object exists - in that case we just leave the message as is in the view. In the case where
* we detect that the object does not exist, we re-populate the parent node with the new children.
*/
public static class CheckExistenceJob extends Job
{
private IAdaptable _remoteObject;
//private TreeItem _parentItem;
private IContextObject _context;
public CheckExistenceJob(IAdaptable remoteObject, TreeItem parentItem, IContextObject context)
{
super("Check existence"); //$NON-NLS-1$
_remoteObject = remoteObject;
//_parentItem = parentItem;
_context = context;
}
public IStatus run(IProgressMonitor monitor)
{
ISystemViewElementAdapter adapter = (ISystemViewElementAdapter)_remoteObject.getAdapter(ISystemViewElementAdapter.class);
if (adapter != null)
{
final Object[] children = adapter.getChildren(_context, monitor);
if (contains(children, _remoteObject))
{
// we want to end this so the user sees the error message
}
else
{
Display.getDefault().asyncExec(new Runnable(){
public void run()
{
/*
// first need to remove the old items
TreeItem[] items = _parentItem.getItems();
for (int i = 0; i < items.length; i++) {
if (items[i].getData() != null) {
disassociate(items[i]);
items[i].dispose();
} else {
items[i].dispose();
}
}
// we want to propagate the changes to the view
add(_context.getModelObject(), children);
*/
// refresh using the event since other views may need updating
IAdaptable par = _context.getModelObject();
ISystemRegistry sr = RSECorePlugin.getTheSystemRegistry();
sr.fireEvent(new SystemResourceChangeEvent(par, ISystemResourceChangeEvents.EVENT_REFRESH_REMOTE, null));
}
});
}
}
return Status.OK_STATUS;
}
public static boolean contains(Object[] children, IAdaptable remoteObject)
{
ISystemViewElementAdapter adapter1 = (ISystemViewElementAdapter)remoteObject.getAdapter(ISystemViewElementAdapter.class);
String path1 = adapter1==null ? null : adapter1.getAbsoluteName(remoteObject);
for (int i = 0; i < children.length; i++)
{
if (remoteObject==children[i] || remoteObject.equals(children[i]))
{
return true;
}
else if (children[i] instanceof IAdaptable)
{
IAdaptable remoteObject2 = (IAdaptable)children[i];
ISystemViewElementAdapter adapter2 = (ISystemViewElementAdapter)remoteObject2.getAdapter(ISystemViewElementAdapter.class);
if (adapter2 != null)
{
String path2 = adapter2.getAbsoluteName(remoteObject2);
if (path1 != null && path2 != null && path1.equals(path2))
{
return true;
}
}
}
}
return false;
}
}
public void add(Object parentElementOrTreePath, Object[] childElements) {
assertElementsNotNull(childElements);
@ -5817,13 +5916,9 @@ public class SystemView extends SafeTreeViewer
newChildren = adapter.getChildren(contextObject, new NullProgressMonitor());
internalAdd(match, parentElementOrTreePath, newChildren);
}
}
else
{
internalAdd(match, parentElementOrTreePath, childElements);
// refresh parent in this case because the parentElementOrTreePath may no longer exist
@ -5831,10 +5926,34 @@ public class SystemView extends SafeTreeViewer
{
if (adapter.isRemote(parentElementOrTreePath) && !adapter.hasChildren((IAdaptable)parentElementOrTreePath))
{
// refresh the parent
Object par = adapter.getParent(parentElementOrTreePath);
ISystemRegistry sr = RSECorePlugin.getTheSystemRegistry();
sr.fireEvent(new SystemResourceChangeEvent(par, ISystemResourceChangeEvents.EVENT_REFRESH_REMOTE, null));
/*
// refresh the parent
Object par = adapter.getParent(parentElementOrTreePath);
ISystemRegistry sr = RSECorePlugin.getTheSystemRegistry();
sr.fireEvent(new SystemResourceChangeEvent(par, ISystemResourceChangeEvents.EVENT_REFRESH_REMOTE, null));
*/
// for bug 204684, using this job to determine whether or not the object exists before trying to update
if (match instanceof TreeItem)
{
TreeItem parentItem = ((TreeItem)match).getParentItem();
if (parentItem != null)
{
IContextObject context = getContextObject(parentItem);
if (adapter.supportsDeferredQueries(context.getSubSystem())) {
CheckExistenceJob job = new CheckExistenceJob((IAdaptable)parentElementOrTreePath, parentItem, context);
job.schedule();
} else {
Object[] children = adapter.getChildren(context, new NullProgressMonitor());
if (!CheckExistenceJob.contains(children, (IAdaptable)parentElementOrTreePath)) {
IAdaptable par = context.getModelObject();
ISystemRegistry sr = RSECorePlugin.getTheSystemRegistry();
sr.fireEvent(new SystemResourceChangeEvent(par, ISystemResourceChangeEvents.EVENT_REFRESH_REMOTE, null));
}
}
}
}
}
}