/**
* 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.model;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Logger;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.w3c.dom.Element;
/**
* The <code>UnitLocation</code> is a place where a <code>Unit</code>
* can be put. The UnitLocation can not store any other Locatables,
* such as {@link Goods}, or {@link TileItem}s.
*
* @see Locatable
*/
public abstract class UnitLocation extends FreeColGameObject implements Location {
private static final Logger logger = Logger.getLogger(UnitLocation.class.getName());
public static enum NoAddReason {
/**
* No reason why Locatable can not be added.
*/
NONE,
/**
* Unit is already in the location.
*/
ALREADY_PRESENT,
/**
* Locatable can not be added because it has the wrong
* type. E.g. a {@link Building} can not be added to a
* {@link Unit}.
*/
WRONG_TYPE,
/**
* Locatable can not be added because the Location is already
* full.
*/
CAPACITY_EXCEEDED,
/**
* Locatable can not be added because the Location is
* occupied by objects belonging to another player.
*/
OCCUPIED_BY_ENEMY,
/**
* Locatable can not be added because the Location belongs
* to another player and does not admit foreign objects.
*/
OWNED_BY_ENEMY,
// Enums can not be extended, so ColonyTile-specific failure reasons
// have to be here.
/**
* Claimed and in use by another of our colonies.
*/
ANOTHER_COLONY,
/**
* Can not add to settlement center tile.
*/
COLONY_CENTER,
/**
* Missing ability to work colony tile.
* Currently only produceInWater, which is assumed by the error message
*/
MISSING_ABILITY,
/**
* Missing skill to work colony tile.
*/
MISSING_SKILL,
/**
* Either unclaimed or claimed but could be acquired.
*/
CLAIM_REQUIRED,
}
/**
* The Units present in this Location.
*/
private final List<Unit> units = new ArrayList<Unit>();
protected UnitLocation() {
// empty constructor
}
/**
* Creates a new <code>UnitLocation</code> instance.
*
* @param game a <code>Game</code> value
*/
public UnitLocation(Game game) {
super(game);
}
/**
* Creates a new <code>UnitLocation</code> instance.
*
* @param game a <code>Game</code> value
* @param in a <code>XMLStreamReader</code> value
* @exception XMLStreamException if an error occurs
*/
public UnitLocation(Game game, XMLStreamReader in)
throws XMLStreamException {
super(game, in);
}
/**
* Creates a new <code>UnitLocation</code> instance.
*
* @param game a <code>Game</code> value
* @param id a <code>String</code> value
*/
public UnitLocation(Game game, String id) {
super(game, id);
}
// Only Unit needs this
public UnitLocation(Game game, Element e) {
super(game, e);
}
/**
* Removes all references to this object.
*
* @return A list of disposed objects.
*/
public List<FreeColGameObject> disposeList() {
List<FreeColGameObject> objects = new ArrayList<FreeColGameObject>();
while (!units.isEmpty()) {
objects.addAll(units.remove(0).disposeList());
}
objects.addAll(super.disposeList());
return objects;
}
/**
* Gets the current space taken by the units in this location.
*
* @return The sum of the space taken by the units in this location.
*/
public int getSpaceTaken() {
int space = 0;
for (Unit u : units) space += u.getSpaceTaken();
return space;
}
/**
* Returns true if there are no Units present in this Location.
*
* @return a <code>boolean</code> value
*/
public boolean isEmpty() {
return units.isEmpty();
}
/**
* Is this unit location full?
*
* @return True if this location is full.
*/
public boolean isFull() {
return units.size() >= getUnitCapacity();
}
/**
* Gets the first <code>Unit</code> beeing carried by this
* <code>Unit</code>.
*
* @return The <code>Unit</code>.
*/
public Unit getFirstUnit() {
List<Unit> units = getUnitList();
return (units.isEmpty()) ? null : units.get(0);
}
/**
* Gets the last <code>Unit</code> beeing carried by this
* <code>Unit</code>.
*
* @return The <code>Unit</code>.
*/
public Unit getLastUnit() {
List<Unit> units = getUnitList();
return (units.isEmpty()) ? null : units.get(units.size()-1);
}
/**
* Move the given unit to the front of the units list.
*
* @param u The <code>Unit</code> to move to the front.
*/
public void moveToFront(Unit u) {
if (units.remove(u)) units.add(0, u);
}
// Interface Location
// getId() inherited from FreeColGameObject
/**
* {@inheritDoc}
*/
public Tile getTile() {
return null; // Override this where it becomes meaningful.
}
/**
* {@inheritDoc}
*/
public StringTemplate getLocationName() {
return StringTemplate.key(getId());
}
/**
* {@inheritDoc}
*/
public StringTemplate getLocationNameFor(Player player) {
return getLocationName();
}
/**
* {@inheritDoc}
*/
public boolean add(Locatable locatable) {
if (locatable instanceof Unit) {
Unit unit = (Unit) locatable;
if (contains(unit)) {
return true;
} else if (canAdd(unit)) {
return units.add(unit);
}
} else if (locatable instanceof Goods) {
// dumping goods is a valid action
locatable.setLocation(null);
logger.finest("Dumped " + locatable + " in UnitLocation with ID "
+ getId());
return true;
} else {
logger.warning("Tried to add Locatable " + locatable
+ " to UnitLocation with ID " + getId() + ".");
}
return false;
}
/**
* {@inheritDoc}
*/
public boolean remove(Locatable locatable) {
if (locatable instanceof Unit) {
return units.remove((Unit)locatable);
} else {
logger.warning("Tried to remove non-Unit " + locatable
+ " from UnitLocation: " + getId());
return false;
}
}
/**
* {@inheritDoc}
*/
public boolean contains(Locatable locatable) {
return units.contains(locatable);
}
/**
* {@inheritDoc}
*/
public boolean canAdd(Locatable locatable) {
return getNoAddReason(locatable) == NoAddReason.NONE;
}
/**
* {@inheritDoc}
*/
public int getUnitCount() {
return units.size();
}
/**
* {@inheritDoc}
*/
public List<Unit> getUnitList() {
return new ArrayList<Unit>(units);
}
/**
* {@inheritDoc}
*/
public Iterator<Unit> getUnitIterator() {
return getUnitList().iterator();
}
/**
* {@inheritDoc}
*/
public GoodsContainer getGoodsContainer() {
return null;
}
/**
* {@inheritDoc}
*/
public Settlement getSettlement() {
return null;
}
/**
* {@inheritDoc}
*/
public Colony getColony() {
return null;
}
// @compat 0.10.5
protected void clearUnitList() {
units.clear();
}
// Overrideable routines to be implemented by UnitLocation subclasses.
/**
* Gets the reason why a given <code>Locatable</code> can not be
* added to this Location.
*
* Be careful to test for unit presence last before success
* (NoAddReason.NONE) except perhaps for the capacity test, so
* that we can treat ALREADY_PRESENT as success in some cases
* (e.g. if the unit changes type --- does it still have a
* required skill?)
*
* TODO: consider moving this up to Location.
*
* @param locatable The <code>Locatable</code> to test.
* @return The reason why adding would fail.
*/
public NoAddReason getNoAddReason(Locatable locatable) {
Unit unit = (locatable instanceof Unit) ? (Unit)locatable : null;
return (unit == null)
? NoAddReason.WRONG_TYPE
: (units == null)
? NoAddReason.CAPACITY_EXCEEDED
: (!isEmpty() && units.get(0).getOwner() != unit.getOwner())
? NoAddReason.OCCUPIED_BY_ENEMY
: (contains(unit))
? NoAddReason.ALREADY_PRESENT
: (unit.getSpaceTaken() + getSpaceTaken() > getUnitCapacity())
? NoAddReason.CAPACITY_EXCEEDED
: NoAddReason.NONE;
}
/**
* Gets the maximum number of <code>Units</code> this Location
* can hold. To be overridden by subclasses.
*
* @return Integer.MAX_VALUE, denoting no effective limit.
*/
public int getUnitCapacity() {
return Integer.MAX_VALUE;
}
// Serialization
/**
* {@inheritDoc}
*/
protected void writeAttributes(XMLStreamWriter out)
throws XMLStreamException {
out.writeAttribute(ID_ATTRIBUTE, getId());
}
/**
* {@inheritDoc}
*/
protected void writeChildren(XMLStreamWriter out, Player player,
boolean showAll, boolean toSavedGame)
throws XMLStreamException {
for (Unit unit : units) {
unit.toXML(out, player, showAll, toSavedGame);
}
}
/**
* {@inheritDoc}
*/
protected void readChildren(XMLStreamReader in) throws XMLStreamException {
units.clear();
while (in.nextTag() != XMLStreamConstants.END_ELEMENT) {
readChild(in);
}
}
/**
* {@inheritDoc}
*/
protected void readChild(XMLStreamReader in) throws XMLStreamException {
if (Unit.getXMLElementTagName().equals(in.getLocalName())) {
Unit unit = updateFreeColGameObject(in, Unit.class);
if (!units.contains(unit)) units.add(unit);
} else {
logger.warning("Found unknown child element '" + in.getLocalName()
+ "' of UnitLocation " + getId() + ".");
in.nextTag();
}
}
}