Bug 137849 Unable to set comparator in StructuredViewer
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
}
	/**
	 * Returns the comparer to use for comparing elements, or
	 * <code>null</code> if none has been set.  If specified,
	 * the viewer uses this to compare and hash elements rather
	 * than the elements' own equals and hashCode methods.
	 *           
	 * @return the comparer to use for comparing elements or
	 *            <code>null</code>
	 */
	public IElementComparer getComparer() {
		return comparer;
	}
	/**
	 * Returns the filtered array of children of the given element. The
	 * resulting array must not be modified, as it may come directly from the
	 * model's internal state.
	 * 
	 * @param parent
	 *            the parent element
	 * @return a filtered array of child elements
	 */
	protected Object[] getFilteredChildren(Object parent) {
		Object[] result = getRawChildren(parent);
		if (filters != null) {
			for (Iterator iter = filters.iterator(); iter.hasNext();) {
				ViewerFilter f = (ViewerFilter) iter.next();
				result = f.filter(this, parent, result);
			}
		}