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jeremybenn |
/* AttributeChangeNotificationFilter.java -- Filter on attribute name
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Copyright (C) 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.management;
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import java.io.Serializable;
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import java.util.Vector;
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/**
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* Performs filtering of {@link AttributeChangeNotification}s
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* based on a list of attribute names.
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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public class AttributeChangeNotificationFilter
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implements NotificationFilter, Serializable
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{
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/**
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* Compatible with JDK 1.5
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*/
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private static final long serialVersionUID = -6347317584796410029L;
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/**
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* Lists the names of the attributes that may pass
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* through the filter.
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*/
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private final Vector<String> enabledAttributes = new Vector<String>();
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/**
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* Blocks all {@link AttributeChangeNotification}s
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* by emptying the list of enabled attributes.
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*/
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public void disableAllAttributes()
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{
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enabledAttributes.clear();
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}
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/**
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* Removes the specified attribute name from the list
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* of enabled attributes, thus preventing
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* {@link AttributeChangeNotification}s for this attribute
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* from passing through the filter. If the attribute is
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* not enabled, this has no effect.
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*
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* @param name the name of the attribute to disable.
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*/
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public void disableAttribute(String name)
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{
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enabledAttributes.remove(name);
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}
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/**
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* Adds the specified attribute name to the list
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* of enabled attributes, thus allowing
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* {@link AttributeChangeNotification}s for this attribute
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* to pass through the filter. If the attribute is
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* enabled, this has no effect.
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*
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* @param name the name of the attribute to enable.
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*/
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public void enableAttribute(String name)
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{
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if (!enabledAttributes.contains(name))
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enabledAttributes.add(name);
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}
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/**
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* Returns the list of enabled attributes for this
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* filter.
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*
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* @return the list of enabled attributes.
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*/
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public Vector<String> getEnabledAttributes()
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{
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return enabledAttributes;
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}
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/**
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* Returns true if the specified notification is an
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* {@link AttributeChangeNotification} and the name of the
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* attribute concerned is in the list of enabled attributes
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* for this filter.
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*
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* @param notif the notification being filtered.
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* @return true if the notification is an
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* {@link AttributeChangeNotification} for an
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* enabled attribute.
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*/
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public boolean isNotificationEnabled(Notification notif)
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{
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if (notif instanceof AttributeChangeNotification)
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{
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AttributeChangeNotification n =
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(AttributeChangeNotification) notif;
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return enabledAttributes.contains(n.getAttributeName());
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}
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return false;
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}
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}
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