001    /*
002      Copyright (C) 2004 Laurent Martelli <laurent@aopsys.com>
003      
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful, but
010      WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012      Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public
015      License along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
017      USA */
018    
019    package org.objectweb.jac.aspects.gui;
020    
021    /**
022     * Useful methods that operate on views.
023     */
024    public class Views {
025    
026        /**
027         * Finds a parent view with a given type
028         *
029         * @param start the view whose parents to search for
030         * @param parentClass the type of the requested parent class
031         * @return a parent view of start whose type is parentClass, or
032         * null if no such view can be found
033         */
034        public static View findParent(View start, Class parentClass) {
035            if (parentClass.isAssignableFrom(start.getClass()))
036                return start;
037            else if (start.getParentView()==null)
038                return null;
039            else
040                return findParent(start.getParentView(),parentClass);
041        }
042    }