java.lang.Object
javax.swing.tree.DefaultMutableTreeNode
javax.swing.JTree.DynamicUtilTreeNode
- All Implemented Interfaces:
Serializable
,Cloneable
,MutableTreeNode
,TreeNode
- 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 will 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. As of 1.4, support for long term storage
of all JavaBeans
has been added to the java.beans
package.
Please see XMLEncoder
.
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Field Summary
Fields Modifier and Type Field Description protected Object
childValue
Value to create children with.protected boolean
hasChildren
Does the thisJTree
have children?protected boolean
loadedChildren
Have the children been loaded yet?Fields declared in class javax.swing.tree.DefaultMutableTreeNode
allowsChildren, children, EMPTY_ENUMERATION, parent, userObject
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Constructor Summary
Constructors Constructor Description DynamicUtilTreeNode(Object value, Object children)
Creates a node with the specified object as its value and with the specified children. -
Method Summary
Modifier and Type Method Description Enumeration<TreeNode>
children()
Subclassed to load the children, if necessary.static void
createChildren(DefaultMutableTreeNode parent, Object children)
Adds to parent all the children inchildren
.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 onchildValue
.Methods declared in 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
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Field Details
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hasChildren
protected boolean hasChildrenDoes the thisJTree
have children? This property is currently not implemented. -
childValue
Value to create children with. -
loadedChildren
protected boolean loadedChildrenHave the children been loaded yet?
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Constructor Details
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DynamicUtilTreeNode
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, aVector
, or aHashtable
-- even if empty. Otherwise, the node is not allowed to have children.- Parameters:
value
- theObject
that is the value for the new nodechildren
- an array ofObject
s, aVector
, or aHashtable
used to create the child nodes; if any other object is specified, or if the value isnull
, then the node is not allowed to have children
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Method Details
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createChildren
Adds to parent all the children inchildren
. Ifchildren
is an array or vector all of its elements are added is children, otherwise ifchildren
is a hashtable all the key/value pairs are added in the orderEnumeration
returns them.- Parameters:
parent
- the parent nodechildren
- the children
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isLeaf
public boolean isLeaf()Returns true if this node allows children. Whether the node allows children depends on how it was created.- Specified by:
isLeaf
in interfaceTreeNode
- Overrides:
isLeaf
in classDefaultMutableTreeNode
- Returns:
- true if this node allows children, false otherwise
- See Also:
JTree.DynamicUtilTreeNode
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getChildCount
public int getChildCount()Returns the number of child nodes.- Specified by:
getChildCount
in interfaceTreeNode
- Overrides:
getChildCount
in classDefaultMutableTreeNode
- Returns:
- the number of child nodes
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loadChildren
protected void loadChildren()Loads the children based onchildValue
. IfchildValue
is aVector
or array each element is added as a child, ifchildValue
is aHashtable
each key/value pair is added in the order thatEnumeration
returns the keys. -
getChildAt
Subclassed to load the children, if necessary.- Specified by:
getChildAt
in interfaceTreeNode
- Overrides:
getChildAt
in classDefaultMutableTreeNode
- Parameters:
index
- an index into this node's child array- Returns:
- the TreeNode in this node's child array at the specified index
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children
Subclassed to load the children, if necessary.- Specified by:
children
in interfaceTreeNode
- Overrides:
children
in classDefaultMutableTreeNode
- Returns:
- an Enumeration of this node's children
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