软件设计-Tutorial19

package Tutorial19;

// 中介者接口
public interface Mediator {
    void sendMessage(AbstractChatRoom chatRoom, AbstractMember member, String message);

    void sendPicture(AbstractChatRoom chatRoom, AbstractMember member, byte[] picture);
}

package Tutorial19;

// 抽象聊天室类
public abstract class AbstractChatRoom {
    protected Mediator mediator;

    public AbstractChatRoom(Mediator mediator) {
        this.mediator = mediator;
    }

    public abstract void sendMessage(AbstractMember member, String message);

    public abstract void sendPicture(AbstractMember member, byte[] picture);
}

package Tutorial19;

// 抽象会员类
public abstract class AbstractMember {
    protected String name;
    protected AbstractChatRoom chatRoom;

    public AbstractMember(String name) {
        this.name = name;
    }

    public void setChatRoom(AbstractChatRoom chatRoom) {
        this.chatRoom = chatRoom;
    }

    public abstract void sendMessage(String message);

    public abstract void sendPicture(byte[] picture);
}

package Tutorial19;

// 新的具体聊天室类，限制发送图片大小和文字长度
public class NewChatRoom extends AbstractChatRoom {
    private static final int MAX_PICTURE_SIZE = 20 * 1024 * 1024; // 20M
    private static final int MAX_TEXT_LENGTH = 100;

    public NewChatRoom(Mediator mediator) {
        super(mediator);
    }

    @Override
    public void sendMessage(AbstractMember member, String message) {
        if (message.length() <= MAX_TEXT_LENGTH) {
            mediator.sendMessage(this, member, message);
        } else {
            System.out.println("发送的文字长度超过限制，无法发送。");
        }
    }

    @Override
    public void sendPicture(AbstractMember member, byte[] picture) {
        if (picture.length <= MAX_PICTURE_SIZE) {
            mediator.sendPicture(this, member, picture);
        } else {
            System.out.println("发送的图片大小超过限制，无法发送。");
        }
    }
}

package Tutorial19;

// 新的具体会员类，可以发送图片和文本信息，并在文本信息后添加时间
import java.text.SimpleDateFormat;
import java.util.Date;

public class NewMember extends AbstractMember {
    public NewMember(String name) {
        super(name);
    }

    @Override
    public void sendMessage(String message) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String timestampedMessage = message + " [" + sdf.format(new Date()) + "]";
        chatRoom.sendMessage(this, timestampedMessage);
    }

    @Override
    public void sendPicture(byte[] picture) {
        chatRoom.sendPicture(this, picture);
    }
}

package Tutorial19;

// 客户端测试类
public class ClientTest {
    public static void main(String[] args) {
        // 创建中介者对象
        Mediator mediator = new Mediator() {
            @Override
            public void sendMessage(AbstractChatRoom chatRoom, AbstractMember member, String message) {
                System.out.println(member.name + " 在 " + chatRoom.getClass().getSimpleName() + " 发送文本消息：" + message);
            }

            @Override
            public void sendPicture(AbstractChatRoom chatRoom, AbstractMember member, byte[] picture) {
                System.out.println(member.name + " 在 " + chatRoom.getClass().getSimpleName() + " 发送图片消息");
            }
        };

        // 创建新的具体聊天室
        NewChatRoom newChatRoom = new NewChatRoom(mediator);

        // 创建新的具体会员
        NewMember member1 = new NewMember("会员1");
        NewMember member2 = new NewMember("会员2");

        // 设置会员所属的聊天室
        member1.setChatRoom(newChatRoom);
        member2.setChatRoom(newChatRoom);

        // 会员发送文本消息
        member1.sendMessage("这是一条不超过100字符的消息");
        member2.sendMessage("我也发一条消息试试");

        // 模拟发送图片（这里只是示例，实际应替换为真实的图片字节数组）
        byte[] samplePicture = new byte[10 * 1024 * 1024]; // 10M大小的示例图片字节数组
        member1.sendPicture(samplePicture);
    }
}