change project structure

app/src/main/java/chess/controller/CommandExecutor.java

@@ -0,0 +1,91 @@
+package chess.controller;
+
+import chess.controller.Command.CommandResult;
+import chess.model.Game;
+import chess.model.Game.GameStatus;
+
+public class CommandExecutor {
+
+	private Game game;
+	private OutputSystem outputSystem;
+
+	public CommandExecutor() {
+		this.game = null;
+		this.outputSystem = null;
+	}
+
+	public CommandResult executeCommand(Command command) {
+		assert this.game != null : "No input game specified !";
+		assert this.outputSystem != null : "No output system specified !";
+
+		CommandResult result = command.execute(this.game, this.outputSystem);
+
+		// non player commands are not supposed to return move result
+		assert result != CommandResult.Moved || command instanceof PlayerCommand;
+
+		processResult(command, result);
+		command.postExec(game, outputSystem);
+		return result;
+	}
+
+	private void processResult(Command command, CommandResult result) {
+		switch (result) {
+			case NotAllowed:
+			case NotMoved:
+				return;
+
+			case ActionNeeded:
+				this.outputSystem.updateDisplay();
+				return;
+
+			case Moved:
+				if (checkGameStatus())
+					return;
+				switchPlayerTurn();
+				this.outputSystem.updateDisplay();
+				return;
+		}
+	}
+
+	private void switchPlayerTurn() {
+		this.game.switchPlayerTurn();
+		this.outputSystem.playerTurn(this.game.getPlayerTurn());
+	}
+
+	/**
+	 * 
+	 * @return True if the game is over
+	 */
+	private boolean checkGameStatus() {
+		GameStatus gameStatus = this.game.checkGameStatus();
+
+		switch (gameStatus) {
+			case Check:
+				this.outputSystem.kingIsInCheck();
+				return false;
+
+			case CheckMate:
+				this.outputSystem.kingIsInMat();
+				this.outputSystem.winnerIs(this.game.getPlayerTurn());
+				return true;
+
+			case OnGoing:
+				return false;
+
+			case Pat:
+				this.outputSystem.patSituation();
+				return true;
+		}
+
+		return false;
+	}
+
+	public void setOutputSystem(OutputSystem outputSystem) {
+		this.outputSystem = outputSystem;
+	}
+
+	public void setGame(Game game) {
+		this.game = game;
+	}
+
+}