add world interface

app/src/main/java/chess/view/DDDrender/loader/Piece3DModel.java

@@ -0,0 +1,75 @@
+package chess.view.DDDrender.loader;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+import chess.model.Color;
+import chess.model.Piece;
+import chess.model.PieceVisitor;
+import chess.model.pieces.Bishop;
+import chess.model.pieces.King;
+import chess.model.pieces.Knight;
+import chess.model.pieces.Pawn;
+import chess.model.pieces.Queen;
+import chess.model.pieces.Rook;
+import chess.view.DDDrender.DDDModel;
+
+public class Piece3DModel implements PieceVisitor<String> {
+
+	private static final String basePath = "3d/";
+	private static final Map<String, DDDModel> cache = new HashMap<>();
+
+	public DDDModel getModel(Piece piece) throws IOException {
+		if (piece == null)
+			return null;
+
+		String path = basePath + colorToString(piece.getColor()) + "-" + visit(piece) + ".fbx";
+		return getModel(path);
+	}
+
+	private DDDModel getModel(String path) throws IOException {
+		DDDModel model = cache.get(path);
+		if (model != null)
+			return model;
+
+		model = ModelLoader.loadModel(path);
+		cache.put(path, model);
+		return model;
+	}
+
+	private String colorToString(Color color) {
+		return color == Color.Black ? "black" : "white";
+	}
+
+	@Override
+	public String visitPiece(Bishop bishop) {
+		return "bishop";
+	}
+
+	@Override
+	public String visitPiece(King king) {
+		return "king";
+	}
+
+	@Override
+	public String visitPiece(Knight knight) {
+		return "knight";
+	}
+
+	@Override
+	public String visitPiece(Pawn pawn) {
+		return "pawn";
+	}
+
+	@Override
+	public String visitPiece(Queen queen) {
+		return "queen";
+	}
+
+	@Override
+	public String visitPiece(Rook rook) {
+		return "rook";
+	}
+
+}