package com.example.model;

import java.io.Serializable;
import java.util.Date;

/**
 * 基础实体类
 * 包含所有实体通用的字段和方法
 */
public abstract class BaseEntity implements Serializable {
    private static final long serialVersionUID = 1L;
    
    private Long id;
    private Date createdAt;
    private Date updatedAt;
    private Boolean active;
    
    public BaseEntity() {
        // 默认为激活状态
        this.active = true;
        
        // 默认设置创建和更新时间
        Date now = new Date();
        this.createdAt = now;
        this.updatedAt = now;
    }
    
    /**
     * 判断实体是否为新建（未持久化）状态
     */
    public boolean isNew() {
        return id == null;
    }
    
    /**
     * 判断实体是否为激活状态
     */
    public boolean isActive() {
        return active == null ? false : active;
    }
    
    /**
     * 激活实体
     */
    public void activate() {
        this.active = true;
        this.updatedAt = new Date();
    }
    
    /**
     * 停用实体
     */
    public void deactivate() {
        this.active = false;
        this.updatedAt = new Date();
    }
    
    /**
     * 更新实体的最后修改时间
     */
    public void touch() {
        this.updatedAt = new Date();
    }
    
    public Long getId() {
        return id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    public Date getCreatedAt() {
        return createdAt;
    }
    
    public void setCreatedAt(Date createdAt) {
        this.createdAt = createdAt;
    }
    
    public Date getUpdatedAt() {
        return updatedAt;
    }
    
    public void setUpdatedAt(Date updatedAt) {
        this.updatedAt = updatedAt;
    }
    
    public Boolean getActive() {
        return active;
    }
    
    public void setActive(Boolean active) {
        this.active = active;
    }
}