vivi-exercises/chess/pieces/King.java

package de.vivi.chess.pieces;

import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;

public class King extends Piece {
    public King(Color color, Type type) {
        super(color, type);
    }

    public King(Color color, Type type, Field field) {
        super(color, type, field);
    }

    @Override
    public char getSymbol() {
        if (getColor() == Color.WHITE) {
            if (getType() == Type.KING) {
                symbol = '\u265A';
            }

        } else if (getColor() == Color.BLACK) {
            if (getType() == Type.KING) {
                symbol = '\u2654';
            }
        }
        return symbol;
    }

    @Override
    public boolean isValidMove(Board board, Field from, Field to) {
        int rowDiff = Math.abs(from.getRow() - to.getRow());
        int colDiff = Math.abs(from.getColumn() - to.getColumn());

        boolean isOneSquareMove = rowDiff <= 1 && colDiff <= 1 && !(rowDiff == 0 && colDiff == 0);

        if (!isOneSquareMove) {
            return false;
        }

        Piece destinationPiece = board.getPiece(Field.from(to.getColumn(), to.getRow()));
        return destinationPiece == null || destinationPiece.getColor() != this.getColor();
    }
}