Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
  * 
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 
 package org.apache.tomcat.util.modeler;
 
 
 

Implementation of NotificationFilter for attribute change notifications. This class is used by BaseModelMBean to construct attribute change notification event filters when a filter is not supplied by the application.

Author(s):
Craig R. McClanahan
Version:
$Revision: 515 $ $Date: 2008-03-17 22:02:23 +0100 (Mon, 17 Mar 2008) $
 
 
 public class BaseAttributeFilter implements NotificationFilter {
 
 
     // ----------------------------------------------------------- Constructors
 

    
Construct a new filter that accepts only the specified attribute name.

Parameters:
name Name of the attribute to be accepted by this filter, or null to accept all attribute names
 
     public BaseAttributeFilter(String name) {
 
         super();
         if (name != null)
             addAttribute(name);
 
     }
 
 
     // ----------------------------------------------------- Instance Variables
 

    
The set of attribute names that are accepted by this filter. If this list is empty, all attribute names are accepted.
 
     private HashSet names = new HashSet();
 
 
     // --------------------------------------------------------- Public Methods
 

    
Add a new attribute name to the set of names accepted by this filter.

Parameters:
name Name of the attribute to be accepted
 
     public void addAttribute(String name) {
 
         synchronized () {
             .add(name);
         }
 
     }


    
Clear all accepted names from this filter, so that it will accept all attribute names.
 
     public void clear() {
 
         synchronized () {
             .clear();
         }
 
     }


    
Return the set of names that are accepted by this filter. If this filter accepts all attribute names, a zero length array will be returned.
    public String[] getNames() {
        synchronized () {
            return ((String[]) .toArray(new String[.size()]));
        }
    }


    

Test whether notification enabled for this event. Return true if:

  • This is an attribute change notification
  • Either the set of accepted names is empty (implying that all attribute names are of interest) or the set of accepted names includes the name of the attribute in this notification
    public boolean isNotificationEnabled(Notification notification) {
        if (notification == null)
            return (false);
        if (!(notification instanceof AttributeChangeNotification))
            return (false);
        AttributeChangeNotification acn =
            (AttributeChangeNotificationnotification;
            return (false);
        synchronized () {
            if (.size() < 1)
                return (true);
            else
                return (.contains(acn.getAttributeName()));
        }
    }


    
Remove an attribute name from the set of names accepted by this filter.

Parameters:
name Name of the attribute to be removed
    public void removeAttribute(String name) {
        synchronized () {
            .remove(name);
        }
    }
New to GrepCode? Check out our FAQ X