78 * appropriate for short term storage or RMI between applications running
79 * the same version of Swing. As of 1.4, support for long term storage
80 * of all JavaBeans™
81 * has been added to the <code>java.beans</code> package.
82 * Please see {@link java.beans.XMLEncoder}.
83 *
84 * @see MutableTreeNode
85 *
86 * @author Rob Davis
87 */
88 @SuppressWarnings("serial") // Same-version serialization only
89 public class DefaultMutableTreeNode implements Cloneable,
90 MutableTreeNode, Serializable
91 {
92 private static final long serialVersionUID = -4298474751201349152L;
93
94 /**
95 * An enumeration that is always empty. This is used when an enumeration
96 * of a leaf node's children is requested.
97 */
98 static public final Enumeration<TreeNode> EMPTY_ENUMERATION
99 = Collections.emptyEnumeration();
100
101 /** this node's parent, or null if this node has no parent */
102 protected MutableTreeNode parent;
103
104 /** array of children, may be null if this node has no children */
105 protected Vector<TreeNode> children;
106
107 /** optional user object */
108 transient protected Object userObject;
109
110 /** true if the node is able to have children */
111 protected boolean allowsChildren;
112
113
114 /**
115 * Creates a tree node that has no parent and no children, but which
116 * allows children.
117 */
118 public DefaultMutableTreeNode() {
119 this(null);
120 }
121
122 /**
123 * Creates a tree node with no parent, no children, but which allows
124 * children, and initializes it with the specified user object.
125 *
126 * @param userObject an Object provided by the user that constitutes
127 * the node's data
128 */
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78 * appropriate for short term storage or RMI between applications running
79 * the same version of Swing. As of 1.4, support for long term storage
80 * of all JavaBeans™
81 * has been added to the <code>java.beans</code> package.
82 * Please see {@link java.beans.XMLEncoder}.
83 *
84 * @see MutableTreeNode
85 *
86 * @author Rob Davis
87 */
88 @SuppressWarnings("serial") // Same-version serialization only
89 public class DefaultMutableTreeNode implements Cloneable,
90 MutableTreeNode, Serializable
91 {
92 private static final long serialVersionUID = -4298474751201349152L;
93
94 /**
95 * An enumeration that is always empty. This is used when an enumeration
96 * of a leaf node's children is requested.
97 */
98 public static final Enumeration<TreeNode> EMPTY_ENUMERATION
99 = Collections.emptyEnumeration();
100
101 /** this node's parent, or null if this node has no parent */
102 protected MutableTreeNode parent;
103
104 /** array of children, may be null if this node has no children */
105 protected Vector<TreeNode> children;
106
107 /** optional user object */
108 protected transient Object userObject;
109
110 /** true if the node is able to have children */
111 protected boolean allowsChildren;
112
113
114 /**
115 * Creates a tree node that has no parent and no children, but which
116 * allows children.
117 */
118 public DefaultMutableTreeNode() {
119 this(null);
120 }
121
122 /**
123 * Creates a tree node with no parent, no children, but which allows
124 * children, and initializes it with the specified user object.
125 *
126 * @param userObject an Object provided by the user that constitutes
127 * the node's data
128 */
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