001    /*
002      Copyright (C) 2002 Renaud Pawlak <renaud@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,
010      but WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012      GNU 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.ide;
020    
021    /**
022     * This is the root class for all the kinds of links. */
023    
024    public abstract class Link extends ModelElement {
025    
026        public Link() {
027        }
028    
029        Role startRole;
030        public Role getStartRole() {
031            return startRole;
032        }
033        public void setStartRole(Role startRole) {
034            this.startRole = startRole;
035        }
036    
037        public void setStart(ModelElement start) {
038            startRole.setStart(start);
039            endRole.setEnd(start);
040        }
041        public ModelElement getStart() {
042            return startRole.getStart();
043        }
044    
045        Role endRole;   
046        public Role getEndRole() {
047            return endRole;
048        }
049        public void setEndRole(Role  endRole) {
050            this.endRole = endRole;
051        }
052    
053        public void setEnd(ModelElement end) {
054            endRole.setStart(end);
055            startRole.setEnd(end);
056        }
057        public ModelElement getEnd() {
058            return endRole.getStart();
059        }
060    
061    }