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/MarkerContentGenerator.java
*            the enabled {@link MarkerFieldFilterGroup}s to apply
	 * @return MarkerMap
	 */
	MarkerMap generateFilteredMarkers(SubProgressMonitor subMonitor,
			boolean andFilters, IResource[] focusResources,
			Collection enabledFilters) {
		Collection returnMarkers = null;
		if (enabledFilters.size() > 0) {
			Iterator filtersIterator = enabledFilters.iterator();
			if (andFilters) {
				Collection matching = new HashSet();
				while (filtersIterator.hasNext()) {
					computeMarkers(matching, subMonitor,
							(MarkerFieldFilterGroup) filtersIterator.next(),
							focusResources);
					if (returnMarkers == null)
						returnMarkers = new HashSet(matching);
					else
						findIntersection(matching, returnMarkers);
					matching.clear();
				}
			} else {
				returnMarkers = new HashSet();
				while (filtersIterator.hasNext()) {
					computeMarkers(returnMarkers, subMonitor,
							(MarkerFieldFilterGroup) filtersIterator.next(),
							focusResources);
				}
			}
		} else