Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JTree.DynamicUtilTreeNode - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing
Class JTree.DynamicUtilTreeNode

java.lang.Object
  |
  +--javax.swing.tree.DefaultMutableTreeNode
        |
        +--javax.swing.JTree.DynamicUtilTreeNode

Enclosing class:: JTree

public static class JTree.DynamicUtilTreeNode
extends DefaultMutableTreeNode

DynamicUtilTreeNode can wrap vectors/hashtables/arrays/strings and create the appropriate children tree nodes as necessary. It is dynamic in that it'll only create the children as necessary.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.

See Also:: Serialized Form

Field Summary

protected Object childValue
          Value to create children with.

protected boolean hasChildren


protected boolean loadedChildren


Fields inherited from class javax.swing.tree.DefaultMutableTreeNode

allowsChildren, children, EMPTY_ENUMERATION, parent, userObject

Constructor Summary

JTree.DynamicUtilTreeNode(Object value, Object children)
          Creates a node with the specified object as its value and with the specified children.

Method Summary

Enumeration children()
          Subclassed to load the children, if necessary.

static void createChildren(DefaultMutableTreeNode parent, Object children)
          Adds to parent all the children in children.

TreeNode getChildAt(int index)
          Subclassed to load the children, if necessary.

int getChildCount()
          Returns the number of child nodes.

boolean isLeaf()
          Returns true if this node allows children.

protected void loadChildren()
          Loads the children based on childValue.

Methods inherited from class javax.swing.tree.DefaultMutableTreeNode

add, breadthFirstEnumeration, clone, depthFirstEnumeration, getAllowsChildren, getChildAfter, getChildBefore, getDepth, getFirstChild, getFirstLeaf, getIndex, getLastChild, getLastLeaf, getLeafCount, getLevel, getNextLeaf, getNextNode, getNextSibling, getParent, getPath, getPathToRoot, getPreviousLeaf, getPreviousNode, getPreviousSibling, getRoot, getSharedAncestor, getSiblingCount, getUserObject, getUserObjectPath, insert, isNodeAncestor, isNodeChild, isNodeDescendant, isNodeRelated, isNodeSibling, isRoot, pathFromAncestorEnumeration, postorderEnumeration, preorderEnumeration, remove, remove, removeAllChildren, removeFromParent, setAllowsChildren, setParent, setUserObject, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

hasChildren

protected boolean hasChildren

childValue

protected Object childValue

Value to create children with.

loadedChildren

protected boolean loadedChildren

Constructor Detail

JTree.DynamicUtilTreeNode

public JTree.DynamicUtilTreeNode(Object value,
                                 Object children)

Creates a node with the specified object as its value and with the specified children. For the node to allow children, the children-object must be an array of objects, a Vector, or a Hashtable -- even if empty. Otherwise, the node is not allowed to have children.

Parameters:: value - the Object that is the value for the new node; children - an array of Objects, a Vector, or a Hashtable used to create the child nodes. If any other object is specified, or if the value is null, then the node is not allowed to have children.

Method Detail

createChildren

public static void createChildren(DefaultMutableTreeNode parent,
                                  Object children)

Adds to parent all the children in children. If children is an array or Vector all of its elements are added is children, otherwise if children is a Hashtable all the key/value pairs are added in the order Enumeration returns them.

isLeaf

public boolean isLeaf()

Returns true if this node allows children. Whether the node allows children depends on how it was created.

Overrides:: isLeaf in class DefaultMutableTreeNode

Returns:: true if this node allows children, false otherwise.
See Also:: JTree.DynamicUtilTreeNode#DynamicUtilTreeNode(Object, Object)

getChildCount

public int getChildCount()

Returns the number of child nodes.

Overrides:: getChildCount in class DefaultMutableTreeNode

Returns:: the number of child nodes

loadChildren

protected void loadChildren()

Loads the children based on childValue. If childValue is a Vector orarray each element added as a child, if childValue is a Hashtable each key/value pair is added in the order that Enumeration returns the keys.

getChildAt

public TreeNode getChildAt(int index)

Subclassed to load the children, if necessary.

Overrides:: getChildAt in class DefaultMutableTreeNode

Tags copied from class: DefaultMutableTreeNode

Parameters:: index - an index into this node's child array
Returns:: the TreeNode in this node's child array at the specified index
Throws:: ArrayIndexOutOfBoundsException - if index is out of bounds

children

public Enumeration children()