Bug 221521 [Markers] New markers API needs to be pared down
We have too much API in some of the new classes and they can be moved to internals
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerPriorityField.java
*/
	public String getValue(MarkerItem item) {
		return MarkerSupportConstants.EMPTY_STRING;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.MarkerField#update(org.eclipse.jface.viewers.ViewerCell)
	 */
	public void update(ViewerCell cell) {
		super.update(cell);
		try {
			switch (((MarkerItem) cell.getElement()).getAttributeValue(
					IMarker.PRIORITY, IMarker.PRIORITY_NORMAL)) {
			case IMarker.PRIORITY_HIGH:
				cell.setImage(getHighPriorityImage());
				break;
			case IMarker.PRIORITY_LOW:
				cell.setImage(MarkerSupportInternalUtilities
						.createImage(LOW_PRIORITY_IMAGE_PATH));
				break;
			default:
				break;
			}
		} catch (NumberFormatException e) {
			return;
		}
	}
}