Bug 221337 [Markers] MarkerItem has too much API
We are exposing too much as API in MarkerItem. We should only provide getAtttributeValue and the methods that support PATH_ATTRIBUTE and NAME_ATTRIBUTE as they are tricky. Everything else needs to be pushed down to an internal class. We should mention the relevant IMarker constants for those removed.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/MarkerField.java
} catch (CoreException e) {
			Policy.handle(e);
			return null;
		}
	}
	/**
	 * Create a FilterConfigurationArea for the receiver.
	 * 
	 * @return FilterConfigurationArea or <code>null</code>
	 */
	public final FilterConfigurationArea generateFilterArea() {
		try {
			if (configurationElement
					.getAttribute(ATTRIBUTE_FILTER_CONFIGURATION_CLASS) == null)
				return null;
			FilterConfigurationArea area = (FilterConfigurationArea) IDEWorkbenchPlugin
					.createExtension(configurationElement,
							ATTRIBUTE_FILTER_CONFIGURATION_CLASS);
			if (area != null)
				area.setField(this);
			return area;
		} catch (CoreException e) {
			Policy.handle(e);
			return null;
		}
	}
	/**
	 * @return The image to be displayed in the column header for this field or
	 *         <code>null<code>.
	 */