Bug 251575 [Viewers] TableViewer support for virtual selection
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
protected int doGetItemCount() {
		return table.getItemCount();
	}
	protected int doIndexOf(Item item) {
		return table.indexOf((TableItem) item);
	}
	protected void doSetItemCount(int count) {
		table.setItemCount(count);
	}
	protected Item[] doGetItems() {
		return table.getItems();
	}
	protected int doGetColumnCount() {
		return table.getColumnCount();
	}
	protected Widget doGetColumn(int index) {
		return table.getColumn(index);
	}
	protected Item doGetItem(int index) {
		return table.getItem(index);
	}
	protected Item[] doGetSelection() {
		return table.getSelection();
	}
	protected int[] doGetSelectionIndices() {
		return table.getSelectionIndices();
	}
	protected void doClearAll() {
		table.clearAll();