/*
 * TouchGraph LLC. Apache-Style Software License
 *
 *
 * Copyright (c) 2001-2002 Alexander Shapiro. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by 
 *        TouchGraph LLC (http://www.touchgraph.com/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "TouchGraph" or "TouchGraph LLC" must not be used to endorse 
 *    or promote products derived from this software without prior written 
 *    permission.  For written permission, please contact 
 *    alex@touchgraph.com
 *
 * 5. Products derived from this software may not be called "TouchGraph",
 *    nor may "TouchGraph" appear in their name, without prior written
 *    permission of alex@touchgraph.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL TOUCHGRAPH OR ITS CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 */

package com.touchgraph.graphlayout.graphelements;

import  com.touchgraph.graphlayout.Node;
import  com.touchgraph.graphlayout.Edge;
import  com.touchgraph.graphlayout.TGException;

import  java.util.Vector;

/**  VisibleLocality:  Extends Locality to spefically handle the 
  *  Nodes + Edges that are visible on screen.  The visible attribute
  *  of the nodes + edges is set to true when they appear on screen, and
  *  false when they are removed from screen.
  *
  *  Locality is used in conjunction with LocalityUtils, which handle
  *  locality shift animations.
  *
  *
  * @author   Alexander Shapiro
  * @version  1.22-jre1.1  $Id: VisibleLocality.java,v 1.1 2002/09/19 15:58:32 ldornbusch Exp $
  */
public class VisibleLocality extends Locality {

    public VisibleLocality(GraphEltSet ges) {
        super(ges);
    }

    public synchronized void addNode( Node node ) throws TGException {
        super.addNode(node);
        node.setVisible(true);        
    }

    public void addEdge( Edge edge ) {
        if(!contains(edge)) {
            super.addEdge(edge);            
            edge.from.visibleEdgeCnt++;
            edge.to.visibleEdgeCnt++;
        }
    }

    public boolean removeEdge( Edge edge ) {
        boolean removed = super.removeEdge(edge);
        if (removed) {
            edge.setVisible(false);
            edge.from.visibleEdgeCnt--;
            edge.to.visibleEdgeCnt--;
        }
        return removed;
    }

    public boolean removeNode( Node node ) {
        boolean removed = super.removeNode(node);
        if (removed) {
            node.setVisible(false);            
        }        
        return removed;
    }

    public synchronized void removeAll() {
        for (int i = 0 ; i < nodeCount(); i++) {
            nodeAt(i).setVisible(false);
        }
        for (int i = 0 ; i < edgeCount(); i++) {
            edgeAt(i).setVisible(false);
        }
        super.removeAll();        
    }
    
    public void updateLocalityFromVisibility() throws TGException {
         //for (int i = 0 ; i < completeEltSet.nodeCount(); i++) {
         //   Node n = nodeAt(i);
        TGForEachNode fen = new TGForEachNode() {
            public void forEachNode( Node node ) {
                try {
                    if (node.isVisible() && !contains(node)) 
                        addNode(node);
                    else if (!node.isVisible() && contains(node))
                        removeNode(node);
                }
                catch (TGException ex) { ex.printStackTrace(); }
            }         
        };
        completeEltSet.forAllNodes(fen); 
        
        //for (int i = 0 ; i < edgeCount(); i++) {
        //    Edge e = edgeAt(i);              
        TGForEachEdge fee = new TGForEachEdge() { 
            public void forEachEdge( Edge edge ) {                           
                if (edge.isVisible() && !contains(edge)) 
                    addEdge(edge);
                else if (!edge.isVisible() && contains(edge))
                    removeEdge(edge);                
            }        
        };
        completeEltSet.forAllEdges(fee);    
    }
} // end com.touchgraph.graphlayout.graphelements.VisibleLocality