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/* * @(#)NotificationFilterSupport.java 4.28 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.management; // java imports // import java.util.Iterator; import java.util.List; import java.util.Vector; /** * Provides an implementation of the {@link javax.management.NotificationFilter} interface. * The filtering is performed on the notification type attribute. * <P> * Manages a list of enabled notification types. * A method allows users to enable/disable as many notification types as required. * <P> * Then, before sending a notification to a listener registered with a filter, * the notification broadcaster compares this notification type with all notification types * enabled by the filter. The notification will be sent to the listener * only if its filter enables this notification type. * <P> * Example: * <BLOCKQUOTE> * <PRE> * NotificationFilterSupport myFilter = new NotificationFilterSupport(); * myFilter.enableType("my_example.my_type"); * myBroadcaster.addListener(myListener, myFilter, null); * </PRE> * </BLOCKQUOTE> * The listener <CODE>myListener</CODE> will only receive notifications the type of which equals/starts with "my_example.my_type". * * @see javax.management.NotificationBroadcaster#addNotificationListener * * @since 1.5 */ public class NotificationFilterSupport implements NotificationFilter { /* Serial version */ private static final long serialVersionUID = 6579080007561786969L; /** * @serial {@link Vector} that contains the enabled notification types. * The default value is an empty vector. */ private List<String> enabledTypes = new Vector<String>(); /** * Invoked before sending the specified notification to the listener. * <BR>This filter compares the type of the specified notification with each enabled type. * If the notification type matches one of the enabled types, * the notification should be sent to the listener and this method returns <CODE>true</CODE>. * * @param notification The notification to be sent. * @return <CODE>true</CODE> if the notification should be sent to the listener, <CODE>false</CODE> otherwise. */ public synchronized boolean isNotificationEnabled(Notification notification) { String type = notification.getType(); if (type == null) { return false; } try { for (String prefix : enabledTypes) { if (type.startsWith(prefix)) { return true; } } } catch (java.lang.NullPointerException e) { // Should never occurs... return false; } return false; } /** * Enables all the notifications the type of which starts with the specified prefix * to be sent to the listener. * <BR>If the specified prefix is already in the list of enabled notification types, * this method has no effect. * <P> * Example: * <BLOCKQUOTE> * <PRE> * // Enables all notifications the type of which starts with "my_example" to be sent. * myFilter.enableType("my_example"); * // Enables all notifications the type of which is "my_example.my_type" to be sent. * myFilter.enableType("my_example.my_type"); * </PRE> * </BLOCKQUOTE> * * Note that: * <BLOCKQUOTE><CODE> * myFilter.enableType("my_example.*"); * </CODE></BLOCKQUOTE> * will no match any notification type. * * @param prefix The prefix. * @exception java.lang.IllegalArgumentException The prefix parameter is null. */ public synchronized void enableType(String prefix) throws IllegalArgumentException { if (prefix == null) { throw new IllegalArgumentException("The prefix cannot be null."); } if (!enabledTypes.contains(prefix)) { enabledTypes.add(prefix); } } /** * Removes the given prefix from the prefix list. * <BR>If the specified prefix is not in the list of enabled notification types, * this method has no effect. * * @param prefix The prefix. */ public synchronized void disableType(String prefix) { enabledTypes.remove(prefix); } /** * Disables all notification types. */ public synchronized void disableAllTypes() { enabledTypes.clear(); } /** * Gets all the enabled notification types for this filter. * * @return The list containing all the enabled notification types. */ public synchronized Vector<String> getEnabledTypes() { return (Vector<String>)enabledTypes; } }