/**
* 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 net.sf.freecol.common.model.Europe;
import net.sf.freecol.common.model.Europe.MigrationType;
import net.sf.freecol.common.model.Game;
import net.sf.freecol.common.model.Player;
import net.sf.freecol.server.FreeColServer;
import net.sf.freecol.server.model.ServerPlayer;
import org.w3c.dom.Element;
/**
* The message sent when a unit is to emigrate.
*/
public class EmigrateUnitMessage extends DOMMessage {
/**
* The slot from which to select the unit.
*/
private String slotString;
/**
* Create a new <code>EmigrateUnitMessage</code> with the supplied slot.
*
* @param slot The slot to select the migrant from.
*/
public EmigrateUnitMessage(int slot) {
this.slotString = Integer.toString(slot);
}
/**
* Create a new <code>EmigrateUnitMessage</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 EmigrateUnitMessage(Game game, Element element) {
this.slotString = element.getAttribute("slot");
}
/**
* Handle a "emigrateUnit"-message.
*
* @param server The <code>FreeColServer</code> handling the message.
* @param player The <code>Player</code> the message applies to.
* @param connection The <code>Connection</code> message was received on.
* @return An <code>Element</code> encapsulating the change,
* or an error <code>Element</code> on failure.
*/
public Element handle(FreeColServer server, Player player,
Connection connection) {
ServerPlayer serverPlayer = server.getPlayer(connection);
Europe europe = player.getEurope();
if (europe == null) {
return DOMMessage.clientError("No Europe to migrate from.");
}
int slot;
try {
slot = Integer.parseInt(slotString);
} catch (NumberFormatException e) {
return DOMMessage.clientError("Bad slot: " + slotString);
}
boolean selected = 1 <= slot && slot <= Europe.RECRUIT_COUNT;
MigrationType type;
int remaining = serverPlayer.getRemainingEmigrants();
if (remaining > 0) {
if (!selected) {
return DOMMessage.clientError("Invalid slot for FoY migration.");
}
type = MigrationType.FOUNTAIN;
} else if (player.checkEmigrate()) {
if (selected) {
if (!player.hasAbility("model.ability.selectRecruit")) {
return DOMMessage.clientError("selectRecruit ability absent.");
}
} else if (slot != 0) {
return DOMMessage.clientError("Invalid slot for normal migration.");
}
type = MigrationType.NORMAL;
} else if (player.checkGold(europe.getRecruitPrice())) {
if (!selected) {
return DOMMessage.clientError("Invalid slot for recruitment.");
}
type = MigrationType.RECRUIT;
} else {
return DOMMessage.clientError("No migrants available.");
}
// Proceed to emigrate.
return server.getInGameController()
.emigrate(serverPlayer, slot, type);
}
/**
* Convert this EmigrateUnitMessage to XML.
*
* @return The XML representation of this message.
*/
public Element toXMLElement() {
Element result = createNewRootElement(getXMLElementTagName());
result.setAttribute("slot", slotString);
return result;
}
/**
* The tag name of the root element representing this object.
*
* @return "emigrateUnit".
*/
public static String getXMLElementTagName() {
return "emigrateUnit";
}
}