Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
* 
	 * @return ContentGeneratorDescriptor
	 */
	public ContentGeneratorDescriptor getDefaultContentGenDescriptor () {
		return (ContentGeneratorDescriptor) generators.get(PROBLEMS_GENERATOR);
	}
	/**
	 * Get the markerGroup associated with categoryName
	 * 
	 * @param categoryName
	 * @return FieldMarkerGroup or <code>null</code>
	 */
	public MarkerGroup getMarkerGroup(String categoryName) {
		if (markerGroups.containsKey(categoryName))
			return (MarkerGroup) markerGroups.get(categoryName);
		return null;
	}
	/**
	 * Return the field that maps to id.
	 * 
	 * @param id
	 * @return {@link MarkerField} or <code>null</code>
	 */
	public MarkerField getField(String id) {
		if (fields.containsKey(id))
			return (MarkerField) fields.get(id);
		return null;
	}
}