148 lines
3.5 KiB
Java
148 lines
3.5 KiB
Java
package fr.iut_fbleau.GameAPI;
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import java.util.NoSuchElementException;
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import java.util.Iterator;
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import java.util.Deque;
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/**
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* An abstract class implementing the interface IBoard.
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*
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* It is used to implement some things to do with the update of the next player
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* which is the same for all turn taking games using a round robin and provides
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* also a minimal implantation of the history mechanism.
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*
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* The current implantation works only for two players.
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*
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*
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*/
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public abstract class AbstractBoard implements IBoard{
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// the player, the turn of which it is to play.
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private Player currentPlayer ;
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// used as a stack.
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private Deque<AbstractPly> history;
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/**
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* set current player to the other player.
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*
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*/
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protected void setNextPlayer(){
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if (this.currentPlayer==Player.PLAYER1){
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this.currentPlayer= Player.PLAYER2;
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}
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else
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this.currentPlayer= Player.PLAYER1;
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}
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/**
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* add the given ply to history so that it becomes the last one.
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*
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*/
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protected void addPlyToHistory(AbstractPly c){
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this.history.addFirst(c);
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}
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/**
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* removes the last ply from history.
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*
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*@throws NoSuchElementException if empty history.
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* @return the last ply from history.
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*/
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protected AbstractPly removePlyFromHistory(){
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return this.history.removeFirst();
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}
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/**
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* @return the last ply from history or null if none.
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*/
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protected AbstractPly getLastPlyFromHistory(){
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return this.history.peekFirst();
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}
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/**
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* @return the current player
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*/
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public Player getCurrentPlayer(){
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return this.currentPlayer;
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}
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/**
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* Returns the game status
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*
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* @return true iff the game is over
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*/
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public abstract boolean isGameOver();
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/**
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*
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* @return the result (null if not over)
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*/
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public abstract Result getResult();
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/**
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* checker of the legality of a ply from this position
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*
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* @return true iff the ply is legal
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*/
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public abstract boolean isLegal(AbstractPly c);
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/**
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* constructor of Iterator over legal moves from this position
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*
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* @return the iterator
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*/
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public abstract Iterator<AbstractPly> iterator();
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/**
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* Plays a given move on the plateau.
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*
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* A daughter class should call super of this last if the move has been done.
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*
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* @throws IllegalArgumentException if the move is always illegal (say from the wrong game)
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* @throws IllegalStateException if the move is not legal in this position
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*
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* @param AbstractPly to be played
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*
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*/
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public void doPly(AbstractPly c){
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// Should update history
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this.addPlyToHistory(c);
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// swap players
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this.setNextPlayer();
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}
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/**
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* Resets the plateau to the position before the last move.
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*
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* A daughter class should probably overwrite this class, but use this code as a base, as it will need to know the ply that needs to be undone.
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*
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* @throws IllegalStateException if nothing to undo in history
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*
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*/
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public void undoPly(){
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AbstractPly p;
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try{
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p=this.removePlyFromHistory();
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}
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catch(NoSuchElementException e) {
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throw new IllegalStateException("No ply in history, nothing can be undone");
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}
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// swap players (works for two players, fairly dangerous if more players, great for a test exam).
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this.setNextPlayer();
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}
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/**
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* creates a safe copy of the board.
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*
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* @return the copy
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*/
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public abstract IBoard safeCopy();
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}
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