abstractrbacuser.java

这是一个基于角色的访问控制程序

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
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 * Portions of this software are based upon public domain software
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package gov.nist.security.rbac;

import java.io.*;
/**
 * A RBAC user base class that provides generic implemenation with no internal data set.
 */
public class AbstractRbacUser implements IRbacUser, Serializable {
  /**
   * Adds the given role to this user.
   * The limit of the number of users that can be assigned to the role
   * should be checked before calling this method.
   * @throws RbacSecurityViolation if the limit of the number of users
   * that can be assigned to the given role is exceeded.
   */
  public boolean addRole(IRole role) throws RbacSecurityViolation {
    if (role == null) {
      return false;
    }
    return role.roleAdded(this);
  }
  /**
   * Removes the given role from this user.
   */
  public boolean dropRole(IRole role) {
    if (role == null) {
      return false;
    }
    return role.roleDropped(this);
  }
  /** Always returns a null set of role. */
  public IRole[] getRoles() {
    return IRole.ZERO_ROLE;
  }
  public IPermission[] getPermissions() {
    return IPermission.ZERO_PERMISSION;
  }
}