irole.java

这是一个基于角色的访问控制程序

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package gov.nist.security.rbac;

import java.util.*;
/** Role to which users and permissions can be assigned. */
public interface IRole {
  /** Role that has all permissons. */
  public static final IRole SUPER_USER = new Role(new IPermission[]{IPermission.ALL_PERMISSION});
  /** Role that has no permission. */
  public static final IRole EMPTY_ROLE = new AbstractRole();
  /** A null role set. */
  public static final IRole[] ZERO_ROLE = new IRole[0];
  /** Returns true iff this role is authorized with the specified permission. */
  public boolean isAuthorized(IPermission perm);
  /** Returns true iff this role is authorized with the specified permissions. */
  public boolean isAuthorized(IPermission[] perm);
  /**
   * Returns the current set of permissions that have been assigned to this role.
   * For advanced permission-role review.
   */
  public IPermission[] getPermissions();
  /** Returns the attributes of this role. */
  public Map getRoleAttributes();  // such as password associated with a role.
  /**
   * Returns true iff the access privilege of this role is
   * greater than or equal to that of the given role.
   */
  public boolean ge(IRole role);
  /** Returns the maximum number of users this role can be assigned to; or 0 if there is no maximum. */
  public int getMaxMembers();
  /**
   * Returns the current list of users this role has been assigned to,
   * either directly or indirectly via the role hierarchy.
   * (A core RBAC feature.)
   */
  public IRbacUser[] getAssignedUsers();
  /**
   * Informs this role that it has just been added to the given user.
   * @return true if this role can be successfully added to the given user;
   * or false if this role has already been added.
   * @throws RbacSecurityViolation if the maximum number of user that
   * can be assigned to this role is exceeded.
   */
  public boolean roleAdded(IRbacUser user) throws RbacSecurityViolation;
  /**
   * Informs this role that it has just been removed from the given user.
   * @return true if this role is successfully removed from the user;
   * or false if there is nothing to remove.
   */
  public boolean roleDropped(IRbacUser user);
  /**
   * Grants the given permission to this role.
   * @return true if the grant is successful;
   * or false if the permission has already been granted.
   */
  public boolean grantPermission(IPermission perm);
  /**
   * Revokes the given permission from this role.
   * @return true if the revokation is successful;
   * or false if there is no such permission to revoke.
   */
  public boolean revokePermission(IPermission perm);
}