chesspao.java

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package chs;

import java.util.List;

public class ChessPao extends ChessItem {

	public ChessPao(String id, int x, int y) {
		super(id, x, y);
	}

	public ChessPao(ChessBoard b, String id, int x, int y) {
		super(b, id, x, y);
	}

	public boolean moveTo(int x, int y) {
		if (!isOnLine(x, y)) {
			System.err.println("not on a line.");
			return false;
		}

		boolean bTgt = (null != b.findItemAt(x, y));
		List lst = b.findItemOnLine(this.getX(), this.getY(), x, y);
		// 中间没子
		if (lst == null || lst.size() == 0) {
			// 目标点有子
			if (bTgt) {
				System.err.println("could not move to.");
				return false;
			}
		} else if (lst.size() == 1) {// 中间有1子
			// 目标点没有子
			if (!bTgt) {
				System.err.println("kill target is null.");
				return false;
			}
		} else {
			// 中间有超过1子
			System.err.println("more than 1 base for fire.");
			return false;
		}

		return true;
	}
}