Bug 82240 [Viewers] Need a content provider for tables that gets elements lazily
Currently all of our viewers assume that all of the elements are avialble. In the case of a virtual table we also want to be able to load elements as they become visible rather than all at once (common issue for databases). Here are some of the issues 1) Need to setItemCount on the table from the content provider 2) Need a getElements(start,finish) method on the content provider 3) Need to decide how to handle staleness. If there are a million items and the viewer just sits there scrolled to the bottom that is a million TableItems and a million Objects represented. How do we manage memory for this?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
* A non visible item has been added.
		 * @param element
		 * @param index
		 */
		public void notVisibleAdded(Object element, int index) {
			
			int requiredCount = index + 1;
			if(requiredCount > getTable().getItemCount()){
				getTable().setItemCount(requiredCount);
			}
			if(requiredCount > virtualElements.length){
				Object[] newElements = new Object[requiredCount];
				System.arraycopy(virtualElements, 0, newElements, 0, virtualElements.length);
				virtualElements = newElements;
			}
			virtualElements[index] = element;
		}
		
	}
	
	private VirtualManager virtualManager;
	/**
	 * TableColorAndFontCollector is an helper class for color and font
	 * support for tables that support the ITableFontProvider and
	 * the ITableColorProvider.
	 * @see ITableColorProvider
	 * @see ITableFontProvider
	 */
	
	private class TableColorAndFontCollector{