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25 
26 package java.util.prefs;
27 
28 import java.io.NotSerializableException;
29 
30 /**
31  * An event emitted by a <tt>Preferences</tt> node to indicate that
32  * a child of that node has been added or removed.<p>
33  *
34  * Note, that although NodeChangeEvent inherits Serializable interface from
35  * java.util.EventObject, it is not intended to be Serializable. Appropriate
36  * serialization methods are implemented to throw NotSerializableException.
37  *
38  * @author  Josh Bloch
39  * @see     Preferences
40  * @see     NodeChangeListener
41  * @see     PreferenceChangeEvent
42  * @since   1.4
43  * @serial  exclude
44  */
45 
46 public class NodeChangeEvent extends java.util.EventObject {
47     /**
48      * The node that was added or removed.
49      *
50      * @serial
51      */
52     private Preferences child;
53 
54     /**
55      * Constructs a new <code>NodeChangeEvent</code> instance.
56      *
57      * @param parent  The parent of the node that was added or removed.
58      * @param child   The node that was added or removed.
59      */
NodeChangeEvent(Preferences parent, Preferences child)60     public NodeChangeEvent(Preferences parent, Preferences child) {
61         super(parent);
62         this.child = child;
63     }
64 
65     /**
66      * Returns the parent of the node that was added or removed.
67      *
68      * @return  The parent Preferences node whose child was added or removed
69      */
getParent()70     public Preferences getParent() {
71         return (Preferences) getSource();
72     }
73 
74     /**
75      * Returns the node that was added or removed.
76      *
77      * @return  The node that was added or removed.
78      */
getChild()79     public Preferences getChild() {
80         return child;
81     }
82 
83     /**
84      * Throws NotSerializableException, since NodeChangeEvent objects are not
85      * intended to be serializable.
86      */
writeObject(java.io.ObjectOutputStream out)87      private void writeObject(java.io.ObjectOutputStream out)
88                                                throws NotSerializableException {
89          throw new NotSerializableException("Not serializable.");
90      }
91 
92     /**
93      * Throws NotSerializableException, since NodeChangeEvent objects are not
94      * intended to be serializable.
95      */
readObject(java.io.ObjectInputStream in)96      private void readObject(java.io.ObjectInputStream in)
97                                                throws NotSerializableException {
98          throw new NotSerializableException("Not serializable.");
99      }
100 
101     // Defined so that this class isn't flagged as a potential problem when
102     // searches for missing serialVersionUID fields are done.
103     private static final long serialVersionUID = 8068949086596572957L;
104 }
105