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package javax.management;


import java.util.Vector;



This class implements of the NotificationFilter interface for the attribute change notification. The filtering is performed on the name of the observed attribute. 

It manages a list of enabled attribute names.
A method allows users to enable/disable as many attribute names as required.

Since:1.5
/**
 * This class implements of the {@link javax.management.NotificationFilter NotificationFilter}
 * interface for the {@link javax.management.AttributeChangeNotification attribute change notification}.
 * The filtering is performed on the name of the observed attribute.
 * <P>
 * It manages a list of enabled attribute names.
 * A method allows users to enable/disable as many attribute names as required.
 *
 * @since 1.5
 */
public class AttributeChangeNotificationFilter implements NotificationFilter {

    /* Serial version */
    private static final long serialVersionUID = -6347317584796410029L;

    
@serialVector that contains the enabled attribute names. The default value is an empty vector.
/**
     * @serial {@link Vector} that contains the enabled attribute names.
     *         The default value is an empty vector.
     */
    private Vector<String> enabledAttributes = new Vector<String>();

    
Constructs an AttributeChangeNotificationFilter. 
/**
     * Constructs an {@code AttributeChangeNotificationFilter}.
     */
    public AttributeChangeNotificationFilter() {}

    
Invoked before sending the specified notification to the listener.

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 true.

Params:
  • notification – The attribute change notification to be sent.
Returns:true if the notification has to be sent to the listener, false otherwise.
/**
     * 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);
    }

    
Enables all the attribute change notifications the attribute name of which equals
the specified name to be sent to the listener.

If the specified name is already in the list of enabled attribute names,
this method has no effect.

Params:
  • name – The attribute name.
Throws:
/**
     * 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 java.lang.IllegalArgumentException The attribute name parameter is null.
     */
    public synchronized void enableAttribute(String name) throws java.lang.IllegalArgumentException {

        if (name == null) {
            throw new java.lang.IllegalArgumentException("The name cannot be null.");
        }
        if (!enabledAttributes.contains(name)) {
            enabledAttributes.addElement(name);
        }
    }

    
Disables all the attribute change notifications the attribute name of which equals
the specified attribute name to be sent to the listener.

If the specified name is not in the list of enabled attribute names,
this method has no effect.

Params:
  • name – The attribute name.
/**
     * Disables all the attribute change notifications the attribute name of which equals
     * the specified attribute name to be sent to the listener.
     * <BR>If the specified name is not in the list of enabled attribute names,
     * this method has no effect.
     *
     * @param name The attribute name.
     */
    public synchronized void disableAttribute(String name) {
        enabledAttributes.removeElement(name);
    }

    
Disables all the attribute names.

/**
     * Disables all the attribute names.
     */
    public synchronized void disableAllAttributes() {
        enabledAttributes.removeAllElements();
    }

    
Gets all the enabled attribute names for this filter.

Returns:The list containing all the enabled attribute names.
/**
     * Gets all the enabled attribute names for this filter.
     *
     * @return The list containing all the enabled attribute names.
     */
    public synchronized Vector<String> getEnabledAttributes() {
        return enabledAttributes;
    }

}