package org.joy.mjtreetable;import javax.swing.tree.*;import javax.swing.event.*; public abstract class AbstractTreeTableModel implements TreeTableModel {    protected Object root;         protected EventListenerList listenerList = new EventListenerList();      public AbstractTreeTableModel(Object root) {        this.root = root;     }    //    // Default implmentations for methods in the TreeModel interface.     //    public Object getRoot() {        return root;    }    public boolean isLeaf(Object node) {        return getChildCount(node) == 0;     }    public void valueForPathChanged(TreePath path, Object newValue) {}    // This is not called in the JTree's default mode: use a naive implementation.     public int getIndexOfChild(Object parent, Object child) {        for (int i = 0; i < getChildCount(parent); i++) {	    if (getChild(parent, i).equals(child)) { 	        return i; 	    }        }	return -1;     }    public void addTreeModelListener(TreeModelListener l) {        listenerList.add(TreeModelListener.class, l);    }    public void removeTreeModelListener(TreeModelListener l) {        listenerList.remove(TreeModelListener.class, l);    }    /*     * Notify all listeners that have registered interest for     * notification on this event type.  The event instance      * is lazily created using the parameters passed into      * the fire method.     * @see EventListenerList     */    protected void fireTreeNodesChanged(Object source, Object[] path,                                         int[] childIndices,                                         Object[] children) {        // Guaranteed to return a non-null array        Object[] listeners = listenerList.getListenerList();        TreeModelEvent e = null;        // Process the listeners last to first, notifying        // those that are interested in this event        for (int i = listeners.length-2; i>=0; i-=2) {            if (listeners[i]==TreeModelListener.class) {                // Lazily create the event:                if (e == null)                    e = new TreeModelEvent(source, path,                                            childIndices, children);                ((TreeModelListener)listeners[i+1]).treeNodesChanged(e);            }                  }    }    /*     * Notify all listeners that have registered interest for     * notification on this event type.  The event instance      * is lazily created using the parameters passed into      * the fire method.     * @see EventListenerList     */    protected void fireTreeNodesInserted(Object source, Object[] path,                                         int[] childIndices,                                         Object[] children) {        // Guaranteed to return a non-null array        Object[] listeners = listenerList.getListenerList();        TreeModelEvent e = null;        // Process the listeners last to first, notifying        // those that are interested in this event        for (int i = listeners.length-2; i>=0; i-=2) {            if (listeners[i]==TreeModelListener.class) {                // Lazily create the event:                if (e == null)                    e = new TreeModelEvent(source, path,                                            childIndices, children);                ((TreeModelListener)listeners[i+1]).treeNodesInserted(e);            }                  }    }    /*     * Notify all listeners that have registered interest for     * notification on this event type.  The event instance      * is lazily created using the parameters passed into      * the fire method.     * @see EventListenerList     */    protected void fireTreeNodesRemoved(Object source, Object[] path,                                         int[] childIndices,                                         Object[] children) {        // Guaranteed to return a non-null array        Object[] listeners = listenerList.getListenerList();        TreeModelEvent e = null;        // Process the listeners last to first, notifying        // those that are interested in this event        for (int i = listeners.length-2; i>=0; i-=2) {            if (listeners[i]==TreeModelListener.class) {                // Lazily create the event:                if (e == null)                    e = new TreeModelEvent(source, path,                                            childIndices, children);                ((TreeModelListener)listeners[i+1]).treeNodesRemoved(e);            }                  }    }    /*     * Notify all listeners that have registered interest for     * notification on this event type.  The event instance      * is lazily created using the parameters passed into      * the fire method.     * @see EventListenerList     */    protected void fireTreeStructureChanged(Object source, Object[] path,                                         int[] childIndices,                                         Object[] children) {        // Guaranteed to return a non-null array        Object[] listeners = listenerList.getListenerList();        TreeModelEvent e = null;        // Process the listeners last to first, notifying        // those that are interested in this event        for (int i = listeners.length-2; i>=0; i-=2) {            if (listeners[i]==TreeModelListener.class) {                // Lazily create the event:                if (e == null)                    e = new TreeModelEvent(source, path,                                            childIndices, children);                ((TreeModelListener)listeners[i+1]).treeStructureChanged(e);            }                  }    }    //    // Default impelmentations for methods in the TreeTableModel interface.     //    public Class getColumnClass(int column) { return Object.class; }   /** By default, make the column with the Tree in it the only editable one.     *  Making this column editable causes the JTable to forward mouse     *  and keyboard events in the Tree column to the underlying JTree.     */     public boolean isCellEditable(Object node, int column) {          return getColumnClass(column) == TreeTableModel.class;     }    public void setValueAt(Object aValue, Object node, int column) {}    // Left to be implemented in the subclass:    /*      *   public Object getChild(Object parent, int index)     *   public int getChildCount(Object parent)      *   public int getColumnCount()      *   public String getColumnName(Object node, int column)       *   public Object getValueAt(Object node, int column)      */}