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<  * @(#)ChangeConnectionHandle.java 5.2
---
>  * @(#)ChangeConnectionHandle.java
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>  * Project:		JHotdraw - a GUI framework for technical drawings
>  *				http://www.jhotdraw.org
>  *				http://jhotdraw.sourceforge.net
>  * Copyright:	© by the original author(s) and all contributors
>  * License:		Lesser GNU Public License (LGPL)
>  *				http://www.opensource.org/licenses/lgpl-license.html
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> import CH.ifa.draw.util.Undoable;
> import CH.ifa.draw.util.UndoableAdapter;
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< import java.awt.*;
---
> import java.awt.*;
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< 
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>  *
>  * @version <$CURRENT_VERSION$>
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> 	private Connector         fOriginalTarget;
> 	private Figure            myTarget;
> 	private ConnectionFigure  myConnection;
> 	private Point             fStart;
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<     protected Connector         fOriginalTarget;
<     protected Figure            fTarget;
<     protected ConnectionFigure  fConnection;
<     protected Point             fStart;
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<         fConnection = (ConnectionFigure) owner();
---
> 		setConnection((ConnectionFigure) owner());
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<         fTarget = null;
---
> 		setTarget(null);
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> 		if (target() == getConnection().getStartConnector()) {
> 			return getConnection().getEndConnector();
> 		}
> 		return getConnection().getStartConnector();
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<         if (target() == fConnection.start())
<             return fConnection.end();
<         return fConnection.start();
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> 
> 		setUndoActivity(createUndoActivity());
> 		((ChangeConnectionHandle.UndoActivity)getUndoActivity()).setOldConnector(target());
> 
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> 		if (f != getTarget()) {
> 			if (getTarget() != null) {
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<         if (f != fTarget) {
<             if (fTarget != null)
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<                 fTarget.connectorVisibility(false);
---
> 				getTarget().connectorVisibility(false);
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> 			}
> 			setTarget(f);
> 			if (getTarget() != null) {
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<             fTarget = f;
<             if (fTarget != null)
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> 			}
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<                 fTarget.connectorVisibility(true);
---
> 				getTarget().connectorVisibility(true);
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<         if (target != null)
---
> 		if (target != null) {
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> 		}
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<         if (target == null)
---
> 		if (target == null) {
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> 		}
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> 		getConnection().updateConnection();
> 
> 		Connector oldConnector = ((ChangeConnectionHandle.UndoActivity)
> 			getUndoActivity()).getOldConnector();
> 		// there has been no change so there is nothing to undo
> 		if ((oldConnector == null)
> 				|| (target() == null)
> 				|| (oldConnector.owner() == target().owner())) {
> 			setUndoActivity(null);
> 		}
> 		else {
> 			getUndoActivity().setAffectedFigures(new SingleFigureEnumerator(getConnection()));
> 		}
> 
> 		if (getTarget() != null) {
> 			getTarget().connectorVisibility(false);
> 			setTarget(null);
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<         fConnection.updateConnection();
<         if (fTarget != null) {
<             fTarget.connectorVisibility(false);
<             fTarget = null;
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<              && fConnection.canConnect(source().owner(), target)) {
---
> 			 && getConnection().canConnect(source().owner(), target)) {
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<             if (!figure.includes(fConnection) && figure.canConnect()) {
---
> 			if (!figure.includes(getConnection()) && figure.canConnect()) {
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<                 if (figure.containsPoint(x, y))
---
> 				if (figure.containsPoint(x, y)) {
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> 		}
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> 	
> 	protected void setConnection(ConnectionFigure newConnection) {
> 		myConnection = newConnection;
> 	}
> 	
> 	protected ConnectionFigure getConnection() {
> 		return myConnection;
> 	}
> 	
> 	protected void setTarget(Figure newTarget) {
> 		myTarget = newTarget;
> 	}
> 	
> 	protected Figure getTarget() {
> 		return myTarget;
> 	}
> 
> 	/**
> 	 * Factory method for undo activity. To be overriden by subclasses.
> 	 */
> 	protected abstract Undoable createUndoActivity();
> 	
> 	public static abstract class UndoActivity extends UndoableAdapter {
> 		private Connector myOldConnector;
> 		
> 		public UndoActivity() {
> 			super(null);
> 			setUndoable(true);
> 			setRedoable(true);
> 		}
> 		
> 		public boolean undo() {
> 			if (!super.undo()) {
> 				return false;
> 			}
> 
> 			swapConnectors();
> 			return true;
> 		}
> 	
> 		public boolean redo() {
> 			// do not call execute directly as the selection might has changed
> 			if (!isRedoable()) {
> 				return false;
> 			}
> 
> 			swapConnectors();
> 			return true;
> 		}
> 
> 		private void swapConnectors() {
> 			FigureEnumeration fe = getAffectedFigures();
> 			if (fe.hasMoreElements()) {
> 				ConnectionFigure connection = (ConnectionFigure)fe.nextFigure();
> 				setOldConnector(replaceConnector(connection));
> 				connection.updateConnection();
> 			}
> 		}
> 
> 		protected abstract Connector replaceConnector(ConnectionFigure connection);
> 				
> 		public void setOldConnector(Connector newOldConnector) {
> 			myOldConnector = newOldConnector;
> 		}
> 		
> 		public Connector getOldConnector() {
> 			return myOldConnector;
> 		}
> 	}