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/*******************************************************************************
* Copyright (c) 2006, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.model;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IHasChildrenUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeViewer;
/**
* @since 3.3
*/
class HasChildrenUpdate extends ViewerUpdateMonitor implements IHasChildrenUpdate {
private boolean fHasChildren = false;
private List fBatchedRequests = null;
/**
* @param contentProvider
*/
public HasChildrenUpdate(ModelContentProvider contentProvider, TreePath elementPath, Object element, IElementContentProvider elementContentProvider, IPresentationContext context) {
super(contentProvider, elementPath, element, elementContentProvider, context);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ViewerUpdateMonitor#performUpdate()
*/
protected void performUpdate() {
ModelContentProvider contentProvider = getContentProvider();
TreePath elementPath = getElementPath();
if (!fHasChildren) {
contentProvider.clearFilters(elementPath);
}
if (ModelContentProvider.DEBUG_CONTENT_PROVIDER) {
System.out.println("setHasChildren(" + getElement() + " >> " + fHasChildren); //$NON-NLS-1$ //$NON-NLS-2$
}
((TreeViewer)(contentProvider.getViewer())).setHasChildren(elementPath, fHasChildren);
if (elementPath.getSegmentCount() > 0) {
contentProvider.doRestore(elementPath);
}
}
public void setHasChilren(boolean hasChildren) {
fHasChildren = hasChildren;
}
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append("IHasChildrenUpdate: "); //$NON-NLS-1$
buf.append(getElement());
return buf.toString();
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ViewerUpdateMonitor#coalesce(org.eclipse.debug.internal.ui.viewers.model.ViewerUpdateMonitor)
*/
boolean coalesce(ViewerUpdateMonitor request) {
if (request instanceof HasChildrenUpdate) {
if (getElementPath().equals(request.getElementPath())) {
// duplicate request
return true;
} else if (getElementContentProvider().equals(request.getElementContentProvider())) {
if (fBatchedRequests == null) {
fBatchedRequests = new ArrayList();
fBatchedRequests.add(this);
}
fBatchedRequests.add(request);
return true;
}
}
return false;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ViewerUpdateMonitor#startRequest()
*/
void startRequest() {
if (fBatchedRequests == null) {
getElementContentProvider().update(new IHasChildrenUpdate[]{this});
} else {
IHasChildrenUpdate[] updates = (IHasChildrenUpdate[]) fBatchedRequests.toArray(new IHasChildrenUpdate[fBatchedRequests.size()]);
// notify that the other updates have also started to ensure correct sequence
// of model updates - **** start at index 1 since the first (0) update has
// already notified the content provider that it has started.
for (int i = 1; i < updates.length; i++) {
getContentProvider().updateStarted((ViewerUpdateMonitor) updates[i]);
}
getElementContentProvider().update(updates);
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ViewerUpdateMonitor#getPriority()
*/
int getPriority() {
return 1;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ViewerUpdateMonitor#getSchedulingPath()
*/
TreePath getSchedulingPath() {
TreePath path = getElementPath();
if (path.getSegmentCount() > 0) {
return path.getParentPath();
}
return path;
}
}
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