/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: ExternalVisitor.java
* Written by: Christian Harnisch, Ingo Besenfelder, Michael Neumann (Team 3)
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.routing.experimentalAStar3.algorithm;
/**
* @author Christian Harnisch
*
*/
public class ExternalVisitor<T extends AStarNodeBase<T>> implements AStarMapVisitorBase<T>
{
/* Search context */
private AStarOpenListBase<T> openList;
private AStarClosedListBase<T> closedList;
private AStarMapBase<T> map;
private AStarGoalBase<T> goal;
public ExternalVisitor(AStarOpenListBase<T> openList, AStarClosedListBase<T> closedList, AStarMapBase<T> map,
AStarGoalBase<T> goal)
{
this.openList = openList;
this.closedList = closedList;
this.map = map;
this.goal = goal;
}
/*
* (non-Javadoc)
*
* @seecom.sun.electric.tool.routing.astar.t3.algorithm.AStarMapVisitorBase#
* visitNeighbour(com.sun.electric.tool.routing.astar.t3.algorithm.T, int,
* int, int)
*/
public void visitNeighbour(T origin, int x, int y, int z)
{
// Tile neighbour = neighbours[i];
int costFromStart = origin.costFromStart + goal.getNodeCost(origin, x, y, z);
int costToGoal = goal.distanceToGoal(x, y, z);
int totalCost = costFromStart + costToGoal;
// Check if on open/closed list
// If yes, check if new path is more efficient (lower f value)
// and update path if so.
T foundNode = openList.findOpenNode(x, y, z);
boolean foundCheaperPath = false;
if (foundNode != null)
{
if (totalCost < foundNode.getTotalCost())
{
foundCheaperPath = true;
openList.removeNodeFromOpenList(foundNode);
}
}
else
{
foundNode = closedList.findClosedNode(x, y, z);
if (foundNode != null)
{
if (totalCost < foundNode.getTotalCost())
{
foundCheaperPath = true;
closedList.removeNodeFromClosedList(foundNode);
}
}
else
{
// Node not found in open and closed list, thus put a
// new one on the open list.
foundNode = map.nodeAt(x, y, z);
foundCheaperPath = true;
}
}
if (foundCheaperPath)
{
foundNode.origin = origin;
foundNode.costFromStart = costFromStart;
foundNode.costToGoal = costToGoal;
foundNode.totalCost = totalCost;
openList.addNodeToOpenList(foundNode);
}
}
}