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/CachedMarkerBuilder.java
* @return {@link MarkerField}[]
	 */
	MarkerField[] getVisibleFields() {
		return visibleFields;
	}
	/**
	 * Return whether or not the receiver has markers without scheduling
	 * anything if it doesn't.
	 * 
	 * @return boolean <code>true</code> if the markers have not been
	 *         calculated.
	 */
	boolean hasNoMarkers() {
		return currentMap == null;
	}
	/**
	 * Initialise the visible fields based pm
	 */
	private void initialiseVisibleFields() {
		MarkerField[] initialFields = getGenerator().getInitialVisible();
		visibleFields = new MarkerField[initialFields.length];
		System.arraycopy(initialFields, 0, visibleFields, 0,
				initialFields.length);
	}
	/**
	 * Return whether or not the receiver is building.
	 * 
	 * @return boolean
	 */
	public boolean isBuilding() {