Java权限管理系统，如何实现源码级的安全控制？

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class PermissionManager {
    private Map<String, Set<String>> userRoles = new HashMap<>();
    private Map<String, Set<String>> rolePermissions = new HashMap<>();
    public void addUser(String user) {
        userRoles.put(user, new HashSet<>());
    }
    public void addRole(String role) {
        rolePermissions.put(role, new HashSet<>());
    }
    public void assignRoleToUser(String user, String role) {
        Set<String> roles = userRoles.get(user);
        if (roles != null) {
            roles.add(role);
        }
    }
    public void addPermissionToRole(String role, String permission) {
        Set<String> permissions = rolePermissions.get(role);
        if (permissions != null) {
            permissions.add(permission);
        }
    }
    public boolean hasPermission(String user, String permission) {
        Set<String> roles = userRoles.get(user);
        if (roles == null) {
            return false;
        }
        for (String role : roles) {
            Set<String> permissions = rolePermissions.get(role);
            if (permissions != null && permissions.contains(permission)) {
                return true;
            }
        }
        return false;
    }
    public static void main(String[] args) {
        PermissionManager pm = new PermissionManager();
        pm.addUser("Alice");
        pm.addUser("Bob");
        pm.addRole("admin");
        pm.addRole("user");
        pm.assignRoleToUser("Alice", "admin");
        pm.assignRoleToUser("Bob", "user");
        pm.addPermissionToRole("admin", "read");
        pm.addPermissionToRole("admin", "write");
        pm.addPermissionToRole("user", "read");
        System.out.println("Alice has read permission: " + pm.hasPermission("Alice", "read")); // true
        System.out.println("Alice has write permission: " + pm.hasPermission("Alice", "write")); // true
        System.out.println("Bob has read permission: " + pm.hasPermission("Bob", "read")); // true
        System.out.println("Bob has write permission: " + pm.hasPermission("Bob", "write")); // false
    }
}

这个示例中，我们创建了一个PermissionManager类，用于管理用户、角色和权限，我们使用两个HashMap来存储用户的角色和角色的权限。addUser和addRole方法分别用于添加用户和角色。assignRoleToUser方法用于将角色分配给用户，addPermissionToRole方法用于将权限添加到角色。hasPermission方法用于检查用户是否具有特定权限。

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