basic model

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

@@ -0,0 +1,107 @@
+package chess.model;
+
+import chess.model.visitor.KingIdentifier;
+import chess.model.visitor.PiecePathChecker;
+
+public class ChessBoard {
+	public static class Cell {
+		private Piece piece;
+
+		public Cell() {
+			this.piece = null;
+		}
+
+		public Piece getPiece() {
+			return piece;
+		}
+
+		public void setPiece(Piece piece) {
+			this.piece = piece;
+		}
+
+	}
+
+	private final Cell[][] cells;
+
+	public ChessBoard() {
+		this.cells = new Cell[Coordinate.VALUE_MAX][Coordinate.VALUE_MAX];
+	}
+
+	public void applyMove(Move move) {
+		assert (move.isValid());
+		Piece deadPiece = pieceAt(move.getFinish());
+		if (deadPiece != null) {
+			deadPiece.eject();
+		}
+		Piece movingPiece = pieceAt(move.getStart());
+		pieceComes(movingPiece, move.getFinish());
+		pieceLeaves(move.getStart());
+	}
+
+	public void undoMove(Move move) {
+		// for later
+	}
+
+	public boolean isCellEmpty(Coordinate coordinate) {
+		return pieceAt(coordinate) == null;
+	}
+
+	public Piece pieceAt(Coordinate coordinate) {
+		assert (coordinate.isValid());
+		return cellAt(coordinate).getPiece();
+	}
+
+	public void clearBoard() {
+		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
+			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
+				pieceLeaves(new Coordinate(i, j));
+			}
+		}
+	}
+
+	private Cell cellAt(Coordinate coordinate) {
+		return this.cells[coordinate.getX()][coordinate.getY()];
+	}
+
+	private void pieceComes(Piece piece, Coordinate coordinate) {
+		cellAt(coordinate).setPiece(piece);
+	}
+
+	private void pieceLeaves(Coordinate coordinate) {
+		cellAt(coordinate).setPiece(null);
+	}
+
+	public Coordinate findKing(Color color) {
+		KingIdentifier kingIdentifier = new KingIdentifier(color);
+		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
+			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
+				Coordinate coordinate = new Coordinate(i, j);
+				Piece piece = pieceAt(coordinate);
+				if (piece != null && kingIdentifier.visit(piece)) {
+					return coordinate;
+				}
+			}
+		}
+		assert false : "No king found ?!";
+		return null;
+	}
+
+	public boolean isKingInCheck(Color color) {
+		Coordinate kingPos = findKing(color);
+		assert kingPos.isValid() : "King position is invalid!";
+
+		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
+			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
+				Coordinate attackCoords = new Coordinate(i, j);
+				Piece attackPiece = pieceAt(attackCoords);
+				if (attackPiece == null)
+					continue;
+
+				PiecePathChecker checker = new PiecePathChecker(this, new Move(attackCoords, kingPos));
+				if (checker.isValidForPiece(attackPiece))
+					return true;
+			}
+		}
+		return false;
+	}
+}