javax.swing

Class 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.

    • Field Detail

      • hasChildren

        protected boolean hasChildren
        Does the this JTree have children? This property is currently not implemented.

      • childValue

        protected Object childValue
        Value to create children with.

      • loadedChildren

        protected boolean loadedChildren
        Have the children been loaded yet?

    • Constructor Detail

      • DynamicUtilTreeNode

        public 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.
        Specified by:
        isLeaf in interface  TreeNode
        Overrides:
        isLeaf in class  DefaultMutableTreeNode
        Returns:
        true if this node allows children, false otherwise
        See Also:
        JTree.DynamicUtilTreeNode

      • loadChildren

        protected void loadChildren()
        Loads the children based on childValue. If childValue is a Vector or array each element is 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.
        Specified by:
        getChildAt in interface  TreeNode
        Overrides:
        getChildAt in 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