/**
* Copyright (C) 2002-2012 The FreeCol Team
*
* This file is part of FreeCol.
*
* FreeCol 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 2 of the License, or
* (at your option) any later version.
*
* FreeCol 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 FreeCol. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.freecol.common.networking;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import net.sf.freecol.common.model.FreeColObject;
import net.sf.freecol.common.model.Game;
import net.sf.freecol.common.model.Player;
import net.sf.freecol.common.model.TradeRoute;
import net.sf.freecol.server.FreeColServer;
import net.sf.freecol.server.model.ServerPlayer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
/**
* The message sent when setting the trade routes.
*/
public class SetTradeRoutesMessage extends DOMMessage {
private static final String idPrefix = "shadow-";
/**
* The trade routes to set.
*/
private List<TradeRoute> tradeRoutes;
/**
* Create a new <code>SetTradeRoutesMessage</code> with the
* supplied routes.
*
* @param tradeRoutes A list of <code>TradeRoute</code>s to set.
*/
public SetTradeRoutesMessage(List<TradeRoute> tradeRoutes) {
this.tradeRoutes = tradeRoutes;
}
/**
* Create a new <code>SetTradeRoutesMessage</code> from a
* supplied element.
*
* @param game The <code>Game</code> this message belongs to.
* @param element The <code>Element</code> to use to create the message.
*/
public SetTradeRoutesMessage(Game game, Element element) {
List<TradeRoute> newRoutes = new ArrayList<TradeRoute>();
NodeList nodes = element.getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {
TradeRoute route
= tradeRouteFromElement(game, (Element) nodes.item(i));
if (route != null) newRoutes.add(route);
}
this.tradeRoutes = newRoutes;
}
/**
* Creates a trade route from an element. Be careful not to allow
* real IDs to surface or the trade route constructor will replace
* the existing game trade route with the one in the element
* before we have finished checking it.
*
* Public routine as updateTradeRoute has the same problem.
*
* @param game The <code>Game</code> to create in.
* @param element An <code>Element</code> to read from.
* @return A <code>TradeRoute</code> on success, null on error.
*/
public static TradeRoute tradeRouteFromElement(Game game, Element element) {
String id = element.getAttribute(FreeColObject.ID_ATTRIBUTE);
element.setAttribute(FreeColObject.ID_ATTRIBUTE, idPrefix + id);
try {
return new TradeRoute(game, element);
} catch (Exception e) {
logger.log(Level.WARNING, "Could not build trade route " + id, e);
return null;
}
}
public static String getPrefix(TradeRoute route) {
return route.getId().substring(0, idPrefix.length());
}
public static String removePrefix(TradeRoute route) {
return route.getId().substring(idPrefix.length());
}
public static boolean hasPrefix(TradeRoute route) {
return idPrefix.equals(getPrefix(route));
}
/**
* Handle a "setTradeRoutes"-message.
*
* @param server The <code>FreeColServer</code> handling the message.
* @param connection The <code>Connection</code> message was received on.
*
* @return Null, or an error <code>Element</code> on failure.
*/
public Element handle(FreeColServer server, Connection connection) {
Game game = server.getGame();
ServerPlayer serverPlayer = server.getPlayer(connection);
List<TradeRoute> newRoutes = new ArrayList<TradeRoute>();
String errors = "";
for (TradeRoute tradeRoute : tradeRoutes) {
if (tradeRoute.getId() == null || !hasPrefix(tradeRoute)) {
errors += "Bogus route: " + tradeRoute.getId() + ". ";
continue;
}
String id = removePrefix(tradeRoute);
if (!(game.getFreeColGameObject(id) instanceof TradeRoute)) {
errors += "Not a trade route: " + id + ". ";
continue;
}
TradeRoute realRoute = (TradeRoute) game.getFreeColGameObject(id);
if (tradeRoute.getOwner() != (Player) serverPlayer) {
errors += "Not your trade route: " + id + ". ";
continue;
}
}
if (!"".equals(errors)) return DOMMessage.clientError(errors);
for (TradeRoute tradeRoute : tradeRoutes) {
TradeRoute realRoute = (TradeRoute) game
.getFreeColGameObject(removePrefix(tradeRoute));
realRoute.updateFrom(tradeRoute);
newRoutes.add(realRoute);
tradeRoute.dispose();
}
// Proceed to set trade routes
return server.getInGameController()
.setTradeRoutes(serverPlayer, newRoutes);
}
/**
* Convert this SetTradeRoutesMessage to XML.
*
* @return The XML representation of this message.
*/
public Element toXMLElement() {
Element result = createNewRootElement(getXMLElementTagName());
Document doc = result.getOwnerDocument();
for (TradeRoute tradeRoute : tradeRoutes) {
result.appendChild(tradeRoute.toXMLElement(null, doc));
}
return result;
}
/**
* The tag name of the root element representing this object.
*
* @return "setTradeRoutes".
*/
public static String getXMLElementTagName() {
return "setTradeRoutes";
}
}