Exemplo n.º 1
0
  //
  // This function is the recursive search of groups for this
  // implementation of the Group. The search proceeds building up
  // a vector of already seen groups. Only new groups are considered,
  // thereby avoiding loops.
  //
  boolean isMemberRecurse(Principal member, Vector<Group> alreadySeen) {
    Enumeration<? extends Principal> e = members();
    while (e.hasMoreElements()) {
      boolean mem = false;
      Principal p = (Principal) e.nextElement();

      // if the member is in this collection, return true
      if (p.equals(member)) {
        return true;
      } else if (p instanceof GroupImpl) {
        //
        // if not recurse if the group has not been checked already.
        // Can call method in this package only if the object is an
        // instance of this class. Otherwise call the method defined
        // in the interface. (This can lead to a loop if a mixture of
        // implementations form a loop, but we live with this improbable
        // case rather than clutter the interface by forcing the
        // implementation of this method.)
        //
        GroupImpl g = (GroupImpl) p;
        alreadySeen.addElement(this);
        if (!alreadySeen.contains(g)) mem = g.isMemberRecurse(member, alreadySeen);
      } else if (p instanceof Group) {
        Group g = (Group) p;
        if (!alreadySeen.contains(g)) mem = g.isMember(member);
      }

      if (mem) return mem;
    }
    return false;
  }
Exemplo n.º 2
0
 public final void addLineListener(LineListener listener) {
   synchronized (listeners) {
     if (!(listeners.contains(listener))) {
       listeners.addElement(listener);
     }
   }
 }
Exemplo n.º 3
0
  /**
   * adds the specified member to the group.
   *
   * @param user The principal to add to the group.
   * @return true if the member was added - false if the member could not be added.
   */
  public boolean addMember(Principal user) {
    if (groupMembers.contains(user)) return false;

    // do not allow groups to be added to itself.
    if (group.equals(user.toString())) throw new IllegalArgumentException();

    groupMembers.addElement(user);
    return true;
  }
  /**
   * Enables all the attribute change notifications the attribute name of which equals the specified
   * name to be sent to the listener. <br>
   * If the specified name is already in the list of enabled attribute names, this method has no
   * effect.
   *
   * @param name The attribute name.
   * @exception j86.java.lang.IllegalArgumentException The attribute name parameter is null.
   */
  public synchronized void enableAttribute(String name)
      throws j86.java.lang.IllegalArgumentException {

    if (name == null) {
      throw new j86.java.lang.IllegalArgumentException("The name cannot be null.");
    }
    if (!enabledAttributes.contains(name)) {
      enabledAttributes.addElement(name);
    }
  }
  /**
   * Invoked before sending the specified notification to the listener. <br>
   * This filter compares the attribute name of the specified attribute change notification with
   * each enabled attribute name. If the attribute name equals one of the enabled attribute names,
   * the notification must be sent to the listener and this method returns <CODE>true</CODE>.
   *
   * @param notification The attribute change notification to be sent.
   * @return <CODE>true</CODE> if the notification has to be sent to the listener, <CODE>false
   *     </CODE> otherwise.
   */
  public synchronized boolean isNotificationEnabled(Notification notification) {

    String type = notification.getType();

    if ((type == null)
        || (type.equals(AttributeChangeNotification.ATTRIBUTE_CHANGE) == false)
        || (!(notification instanceof AttributeChangeNotification))) {
      return false;
    }

    String attributeName = ((AttributeChangeNotification) notification).getAttributeName();
    return enabledAttributes.contains(attributeName);
  }
Exemplo n.º 6
0
  /**
   * returns true if the passed principal is a member of the group.
   *
   * @param member The principal whose membership must be checked for.
   * @return true if the principal is a member of this group, false otherwise
   */
  public boolean isMember(Principal member) {

    //
    // if the member is part of the group (common case), return true.
    // if not, recursively search depth first in the group looking for the
    // principal.
    //
    if (groupMembers.contains(member)) {
      return true;
    } else {
      Vector<Group> alreadySeen = new Vector<>(10);
      return isMemberRecurse(member, alreadySeen);
    }
  }