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Lazy tree data loading

You can implement tree data lazy loading very easily with two classes:

• ExplorableTreeNode - is an abstract descendant of javax.swing.tree.DefaultMutableTreeNode with enhanced expansion functionality capabilities. If this node has set the 'explorable' property and tree where this node is displayed has installed ExplorationTreeListener as tree expansion listener, then method exploreImpl() is invoked when this node is the first time displayed. Subclass and override this method to process lazy loading.
• ExplorationTreeListener - is a listener which you can add to any tree - it listenes for expand / collapse events and if expanded node is instance of ExplorableTreeNode it invokes its method explore().