/* Soot - a J*va Optimization Framework
 * Copyright (C) 2005 Jennifer Lhotak
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


package ca.mcgill.sable.graph.editparts;

import org.eclipse.gef.editparts.AbstractConnectionEditPart;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.draw2d.*;
import org.eclipse.draw2d.graph.*;
import java.util.*;
import java.beans.*;

import org.eclipse.draw2d.*;

import ca.mcgill.sable.graph.model.Element;

public class EdgeEditPart extends AbstractConnectionEditPart 
	implements PropertyChangeListener
	{
	Font f = new Font(null, "Arial", 8, SWT.NORMAL);
	

	public EdgeEditPart() {
		super();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
	 */
	protected void createEditPolicies() {
	}

	protected IFigure createFigure(){
		PolylineConnection conn = new PolylineConnection();
		
		conn.setTargetDecoration(new PolygonDecoration());
		conn.setConnectionRouter(new BendpointConnectionRouter());
		if (((ca.mcgill.sable.graph.model.Edge)getModel()).getLabel() != null){
			Label connLabel = new Label(((ca.mcgill.sable.graph.model.Edge)getModel()).getLabel());
			connLabel.setFont(f);
			conn.add(connLabel);
			conn.getLayoutManager().setConstraint(connLabel, new MidpointLocator(conn, 0));
		}
		return conn;
	}
	
	public void contributeToGraph(DirectedGraph graph, HashMap map){
		Node source = (Node)map.get(getSource());
		Node target = (Node)map.get(getTarget());
		if (!source.equals(target)){
			Edge e = new Edge(this, source, target);
			graph.edges.add(e);
			map.put(this, e);		
		}
	}
	
	public void applyGraphResults(DirectedGraph graph, HashMap map){
		Edge e = (Edge)map.get(this);
		if (e != null) {
			NodeList nl = e.vNodes;
			PolylineConnection conn = (PolylineConnection)getConnectionFigure();
			if (nl != null){
				ArrayList bends = new ArrayList();
				for (int i = 0; i < nl.size(); i++){
					Node n = nl.getNode(i);
					int x = n.x;
					int y = n.y;
					if (e.isFeedback){
						bends.add(new AbsoluteBendpoint(x, y + n.height));
						bends.add(new AbsoluteBendpoint(x, y));
					}
					else {
						bends.add(new AbsoluteBendpoint(x, y));
						bends.add(new AbsoluteBendpoint(x, y + n.height));
					}
				}
				conn.setRoutingConstraint(bends);
			}
			else {
				conn.setRoutingConstraint(Collections.EMPTY_LIST);
			}
		}
		
	}
	
	
	public Edge getEdge(){
		return (Edge)getModel();
	}
	
	public void propertyChange(PropertyChangeEvent event){
		if (event.getPropertyName().equals(Element.EDGE_LABEL)){
			refreshVisuals();
		}
	}
	
	public void refreshVisuals(){
		if (((ca.mcgill.sable.graph.model.Edge)getModel()).getLabel() != null){
			Label connLabel = new Label(((ca.mcgill.sable.graph.model.Edge)getModel()).getLabel());
			connLabel.setFont(f);
			((PolylineConnection)getFigure()).add(connLabel);
			((PolylineConnection)getFigure()).getLayoutManager().setConstraint(connLabel, new MidpointLocator((PolylineConnection)getFigure(), 0));
		}
		getFigure().revalidate();
	}
	
	public void activate(){
		super.activate();
		((ca.mcgill.sable.graph.model.Edge)getModel()).addPropertyChangeListener(this);
	}
	
	public void deactivate(){
		super.deactivate();
		((ca.mcgill.sable.graph.model.Edge)getModel()).removePropertyChangeListener(this);	
	}
}