/**
* 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.Game;
import net.sf.freecol.common.model.Player;
import net.sf.freecol.common.model.Unit;
import net.sf.freecol.common.model.Unit.UnitState;
import net.sf.freecol.server.FreeColServer;
import net.sf.freecol.server.model.ServerPlayer;
import org.w3c.dom.Element;
/**
* The message sent when changing a unit state.
*/
public class ChangeStateMessage extends DOMMessage {
/**
* The id of the unit to change.
*/
private String unitId;
/**
* The state as a string.
*/
private String stateString;
/**
* Create a new <code>ChangeStateMessage</code> with the
* supplied unit and state.
*
* @param unit The <code>Unit</code> to change the state of.
* @param state The new state.
*/
public ChangeStateMessage(Unit unit, UnitState state) {
this.unitId = unit.getId();
this.stateString = String.valueOf(state);
}
/**
* Create a new <code>ChangeStateMessage</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 ChangeStateMessage(Game game, Element element) {
this.unitId = element.getAttribute("unit");
this.stateString = element.getAttribute("state");
}
/**
* Handle a "changeState"-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 update containing the changeStated unit,
* or an error <code>Element</code> on failure.
*/
public Element handle(FreeColServer server, Player player,
Connection connection) {
ServerPlayer serverPlayer = server.getPlayer(connection);
Unit unit;
try {
unit = server.getUnitSafely(unitId, serverPlayer);
} catch (Exception e) {
return DOMMessage.clientError(e.getMessage());
}
// Do not test if it is on the map, units in Europe can change state.
UnitState state;
try {
state = Enum.valueOf(UnitState.class, stateString);
} catch (Exception e) {
return DOMMessage.clientError(e.getMessage());
}
if (!unit.checkSetState(state)) {
return DOMMessage.clientError("Unit " + unitId
+ " can not set state: " + stateString);
}
// Proceed to change.
return server.getInGameController()
.changeState(serverPlayer, unit, state);
}
/**
* Convert this ChangeStateMessage to XML.
*
* @return The XML representation of this message.
*/
public Element toXMLElement() {
Element result = createNewRootElement(getXMLElementTagName());
result.setAttribute("unit", unitId);
result.setAttribute("state", stateString);
return result;
}
/**
* The tag name of the root element representing this object.
*
* @return "changeState".
*/
public static String getXMLElementTagName() {
return "changeState";
}
}