remove PawnIdentifier

app/src/main/java/chess/controller/commands/PromoteCommand.java

@@ -9,9 +9,9 @@ import chess.model.Game;
 import chess.model.Piece;
 import chess.model.pieces.Bishop;
 import chess.model.pieces.Knight;
+import chess.model.pieces.Pawn;
 import chess.model.pieces.Queen;
 import chess.model.pieces.Rook;
-import chess.model.visitor.PawnIdentifier;
 
 public class PromoteCommand extends PlayerCommand {
 
@@ -43,7 +43,7 @@ public class PromoteCommand extends PlayerCommand {
 			return CommandResult.NotAllowed;
 
 		Piece pawn = board.pieceAt(this.pieceCoords);
-		if (!new PawnIdentifier(game.getPlayerTurn()).isPawn(pawn))
+		if (!(pawn instanceof Pawn))
 			return CommandResult.NotAllowed;
 
 		int destY = this.pieceCoords.getY();

app/src/main/java/chess/model/ChessBoard.java

@@ -5,7 +5,7 @@ import java.util.List;
 import java.util.Objects;
 
 import chess.model.pieces.King;
-import chess.model.visitor.PawnIdentifier;
+import chess.model.pieces.Pawn;
 import chess.model.visitor.PiecePathChecker;
 
 public class ChessBoard {
@@ -296,13 +296,12 @@ public class ChessBoard {
 	 */
 	private Coordinate pawnPromotePosition(Color color) {
 		int enemyLineY = color == Color.White ? 0 : 7;
-		PawnIdentifier identifier = new PawnIdentifier(color);
 
 		for (int x = 0; x < Coordinate.VALUE_MAX; x++) {
 			Coordinate pieceCoords = new Coordinate(x, enemyLineY);
 			Piece piece = pieceAt(pieceCoords);
 
-			if (identifier.isPawn(piece))
+			if (piece instanceof Pawn)
 				return pieceCoords;
 
 		}

app/src/main/java/chess/model/visitor/PawnIdentifier.java

@@ -1,52 +0,0 @@
-package chess.model.visitor;
-
-import chess.model.Color;
-import chess.model.Piece;
-import chess.model.PieceVisitor;
-import chess.model.pieces.*;
-
-public class PawnIdentifier implements PieceVisitor<Boolean> {
-
-	private final Color color;
-
-	public PawnIdentifier(Color color) {
-		this.color = color;
-	}
-
-	public boolean isPawn(Piece piece) {
-		if (piece == null)
-			return false;
-		return visit(piece);
-	}
-
-	@Override
-	public Boolean visitPiece(Bishop bishop) {
-		return false;
-	}
-
-	@Override
-	public Boolean visitPiece(King king) {
-		return false;
-	}
-
-	@Override
-	public Boolean visitPiece(Knight knight) {
-		return false;
-	}
-
-	@Override
-	public Boolean visitPiece(Pawn pawn) {
-		return pawn.getColor() == color;
-	}
-
-	@Override
-	public Boolean visitPiece(Queen queen) {
-		return false;
-	}
-
-	@Override
-	public Boolean visitPiece(Rook rook) {
-		return false;
-	}
-
-}

app/src/main/java/chess/model/visitor/PiecePathChecker.java

@@ -104,10 +104,11 @@ public class PiecePathChecker implements PieceVisitor<Boolean> {
 		Coordinate middle = lastMove.getMiddle();
 
 		if (middle.equals(this.move.getFinish())
-				&& new PawnIdentifier(pieceToEat.getColor()).isPawn(pieceToEat)) {
+				&& pieceToEat instanceof Pawn) {
 			this.move.setDeadPieceCoords(lastMove.getFinish());
 			return true;
 		}
+
 		return false;
 	}