/**
* 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.server.ai.mission;
import java.util.logging.Logger;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import net.sf.freecol.common.model.Location;
import net.sf.freecol.common.model.Tile;
import net.sf.freecol.common.model.pathfinding.CostDeciders;
import net.sf.freecol.server.ai.AIColony;
import net.sf.freecol.server.ai.AIMain;
import net.sf.freecol.server.ai.AIUnit;
/**
* Mission for working inside an AI colony.
*/
public class WorkInsideColonyMission extends Mission {
private static final Logger logger = Logger.getLogger(WorkInsideColonyMission.class.getName());
private static final String tag = "AI worker";
/** The AI colony to work inside. */
private AIColony aiColony;
/**
* Creates a mission for the given <code>AIUnit</code>.
*
* @param aiMain The main AI-object.
* @param aiUnit The <code>AIUnit</code> this mission
* is created for.
* @param aiColony The <code>AIColony</code> the unit should be
* working in.
*/
public WorkInsideColonyMission(AIMain aiMain, AIUnit aiUnit,
AIColony aiColony) {
super(aiMain, aiUnit);
this.aiColony = aiColony;
uninitialized = false;
}
/**
* Creates a new <code>WorkInsideColonyMission</code> and reads
* the given element.
*
* @param aiMain The main AI-object.
* @param in The input stream containing the XML.
* @throws XMLStreamException if a problem was encountered
* during parsing.
* @see net.sf.freecol.server.ai.AIObject#readFromXML
*/
public WorkInsideColonyMission(AIMain aiMain, XMLStreamReader in)
throws XMLStreamException {
super(aiMain);
readFromXML(in);
uninitialized = getAIUnit() == null;
}
/**
* Convenience accessor for the colony to work in.
*
* @return The <code>AIColony</code> to work in.
*/
public AIColony getAIColony() {
return aiColony;
}
// Fake Transportable interface
/**
* Gets the destination for units with this mission.
*
* @return Usually the colony tile unless the unit is there
* already or can get there itself.
*/
public Tile getTransportDestination() {
final Tile colonyTile = (Tile)getTarget();
return (shouldTakeTransportToTile(colonyTile))
? colonyTile
: null;
}
// Mission interface
/**
* Gets the mission target.
*
* @return The mission target location.
*/
public Location getTarget() {
return (aiColony == null || aiColony.getColony() == null) ? null
: aiColony.getColony().getTile();
}
/**
* Why would this mission be invalid with the given AI unit and location?
*
* @param aiUnit The <code>AIUnit</code> to check.
* @param loc The <code>Location</code> to check.
* @return A reason for invalidity, or null if none found.
*/
public static String invalidReason(AIUnit aiUnit, Location loc) {
String reason;
return ((reason = invalidAIUnitReason(aiUnit)) != null) ? reason
: (!aiUnit.getUnit().isPerson()) ? Mission.UNITNOTAPERSON
: ((reason = invalidTargetReason(loc, aiUnit.getUnit().getOwner()))
!= null) ? reason
: null;
}
// Omitted invalidReason(AIUnit), not needed.
/**
* Why is this mission invalid?
*
* @return A reason for mission invalidity, or null if none found.
*/
public String invalidReason() {
return invalidReason(getAIUnit(), getTarget());
}
// Not a one-time mission, omit isOneTime().
/**
* Performs this mission.
*/
public void doMission() {
String reason = invalidReason();
if (reason != null) {
logger.finest(tag + " broken(" + reason + "): " + this);
return;
}
travelToTarget(tag, getTarget(),
CostDeciders.avoidSettlementsAndBlockingUnits());
}
// Serialization
/**
* Writes all of the <code>AIObject</code>s and other AI-related
* information to an XML-stream.
*
* @param out The target stream.
* @throws XMLStreamException if there are any problems writing
* to the stream.
*/
protected void toXMLImpl(XMLStreamWriter out) throws XMLStreamException {
if (isValid()) {
toXML(out, getXMLElementTagName());
}
}
/**
* {@inheritDoc}
*/
protected void writeAttributes(XMLStreamWriter out)
throws XMLStreamException {
super.writeAttributes(out);
out.writeAttribute("colony", aiColony.getId());
}
/**
* {@inheritDoc}
*/
protected void readAttributes(XMLStreamReader in)
throws XMLStreamException {
super.readAttributes(in);
aiColony = (AIColony) getAIMain()
.getAIObject(in.getAttributeValue(null, "colony"));
}
/**
* Gets the tag name of the root element representing this object.
*
* @return "workInsideColonyMission".
*/
public static String getXMLElementTagName() {
return "workInsideColonyMission";
}
}