| /* |
| * 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; |
| |
| |
| import java.util.HashSet; |
| |
| import javax.management.AttributeChangeNotification; |
| import javax.management.Notification; |
| import javax.management.NotificationFilter; |
| |
| |
| /** |
| * <p>Implementation of <code>NotificationFilter</code> for attribute change |
| * notifications. This class is used by <code>BaseModelMBean</code> to |
| * construct attribute change notification event filters when a filter is not |
| * supplied by the application.</p> |
| * |
| * @author Craig R. McClanahan |
| */ |
| public class BaseAttributeFilter implements NotificationFilter { |
| |
| private static final long serialVersionUID = 1L; |
| |
| // ----------------------------------------------------------- Constructors |
| |
| /** |
| * Construct a new filter that accepts only the specified attribute |
| * name. |
| * |
| * @param name Name of the attribute to be accepted by this filter, or |
| * <code>null</code> 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<String> names = new HashSet<>(); |
| |
| |
| // --------------------------------------------------------- Public Methods |
| |
| |
| /** |
| * Add a new attribute name to the set of names accepted by this filter. |
| * |
| * @param name Name of the attribute to be accepted |
| */ |
| public void addAttribute(String name) { |
| |
| synchronized (names) { |
| names.add(name); |
| } |
| |
| } |
| |
| |
| /** |
| * Clear all accepted names from this filter, so that it will accept |
| * all attribute names. |
| */ |
| public void clear() { |
| |
| synchronized (names) { |
| names.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 (names) { |
| return names.toArray(new String[names.size()]); |
| } |
| |
| } |
| |
| |
| /** |
| * <p>Test whether notification enabled for this event. |
| * Return true if:</p> |
| * <ul> |
| * <li>This is an attribute change notification</li> |
| * <li>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</li> |
| * </ul> |
| */ |
| @Override |
| public boolean isNotificationEnabled(Notification notification) { |
| |
| if (notification == null) |
| return (false); |
| if (!(notification instanceof AttributeChangeNotification)) |
| return (false); |
| AttributeChangeNotification acn = |
| (AttributeChangeNotification) notification; |
| if (!AttributeChangeNotification.ATTRIBUTE_CHANGE.equals(acn.getType())) |
| return (false); |
| synchronized (names) { |
| if (names.size() < 1) |
| return (true); |
| else |
| return (names.contains(acn.getAttributeName())); |
| } |
| |
| } |
| |
| |
| /** |
| * Remove an attribute name from the set of names accepted by this |
| * filter. |
| * |
| * @param name Name of the attribute to be removed |
| */ |
| public void removeAttribute(String name) { |
| |
| synchronized (names) { |
| names.remove(name); |
| } |
| |
| } |
| |
| |
| } |