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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.model.elements;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate;
import org.eclipse.debug.ui.IDebugUIConstants;
/**
* This content provider is required in order to have selection maintained properly
* when swtiching between session. The problem is, when swtich debug session, the memory view reset the input
* to the viewer.
*
* After the input is set, viewer's doInitialRestore is called. At this time, the elemtns
* are not mapped in the viewer yet, as a result, the selection cannot be maintained.
*
* The viewer tries to restore selection again after elements are added to the view. This is done
* in the HasChildrenJob. However, this job will not get scheduled unless the element provides a content
* provider adapter. As a result, the job is never scheduled and the selection cannot be maintained.
*
*/
public class MemoryBlockContentProvider extends ElementContentProvider {
@Override
protected int getChildCount(Object element, IPresentationContext context,
IViewerUpdate monitor) throws CoreException {
return 0;
}
@Override
protected Object[] getChildren(Object parent, int index, int length,
IPresentationContext context, IViewerUpdate monitor)
throws CoreException {
return EMPTY;
}
@Override
protected boolean supportsContextId(String id) {
if (id.equals(IDebugUIConstants.ID_MEMORY_VIEW))
return true;
return false;
}
}
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