defaulttreemodel.java

gcc的组建

/* DefaultTreeModel.java -- 
   Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
 
This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */

package javax.swing.tree;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.EventListener;

import javax.swing.event.EventListenerList;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;

/**
 * DefaultTreeModel
 * 
 * @author Andrew Selkirk
 */
public class DefaultTreeModel
    implements Serializable, TreeModel
{
  static final long serialVersionUID = -2621068368932566998L;

  /**
   * root
   */
  protected TreeNode root = null;

  /**
   * listenerList
   */
  protected EventListenerList listenerList = new EventListenerList();

  /**
   * asksAllowsChildren
   */
  protected boolean asksAllowsChildren;

  /**
   * Constructor DefaultTreeModel
   * 
   * @param root the tree root.
   */
  public DefaultTreeModel(TreeNode root)
  {
    if (root == null)
      root = new DefaultMutableTreeNode();
    setRoot(root);
  }

  /**
   * Constructor DefaultTreeModel
   * 
   * @param root the tree root.
   * @param asksAllowsChildren TODO
   */
  public DefaultTreeModel(TreeNode root, boolean asksAllowsChildren)
  {
    setRoot(root);
    this.asksAllowsChildren = asksAllowsChildren;
  }

  /**
   * writeObject
   * 
   * @param obj the object.
   * @exception IOException TODO
   */
  private void writeObject(ObjectOutputStream obj) throws IOException
  {
    // TODO
  }

  /**
   * readObject
   * 
   * @param value0 TODO
   * @exception IOException TODO
   * @exception ClassNotFoundException TODO
   */
  private void readObject(ObjectInputStream value0) throws IOException,
      ClassNotFoundException
  {
    // TODO
  }

  /**
   * asksAllowsChildren
   * 
   * @return boolean
   */
  public boolean asksAllowsChildren()
  {
    return asksAllowsChildren;
  }

  /**
   * setAsksAllowsChildren
   * 
   * @param value TODO
   */
  public void setAsksAllowsChildren(boolean value)
  {
    asksAllowsChildren = value;
  }

  /**
   * setRoot
   * 
   * @param root the root node.
   */
  public void setRoot(TreeNode root)
  {
    // Sanity Check
    if (root == null)
      {
        throw new IllegalArgumentException("null root");
      }
    // Set new root
    this.root = root;
  }

  /**
   * getRoot
   * 
   * @return Object
   */
  public Object getRoot()
  {
    return root;
  }

  /**
   * getIndexOfChild
   * 
   * @param parent TODO
   * @param child TODO
   * @return int
   */
  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;
  }

  /**
   * getChild
   * 
   * @param node TODO
   * @param idx TODO
   * @return Object
   */
  public Object getChild(Object node, int idx)
  {
    if (node instanceof TreeNode)
      return ((TreeNode) node).getChildAt(idx);
    else
      return null;
  }

  /**
   * getChildCount
   * 
   * @param node TODO
   * @return int
   */
  public int getChildCount(Object node)
  {
    if (node instanceof TreeNode)
      return ((TreeNode) node).getChildCount();
    else
      return 0;
  }

  /**
   * isLeaf
   * 
   * @param node TODO
   * @return boolean
   */
  public boolean isLeaf(Object node)
  {
    if (node instanceof TreeNode)
      return ((TreeNode) node).isLeaf();
    else
      return true;
  }

  /**
   * Invoke this method if you've modified the TreeNodes upon 
   * which this model depends. The model will notify all of its 
   * listeners that the model has changed.
   */
  public void reload()
  {
    // TODO
  }

  /**
   * Invoke this method if you've modified the TreeNodes upon 
   * which this model depends. The model will notify all of its 
   * listeners that the model has changed.
   * 
   * @param node - TODO
   */
  public void reload(TreeNode node)
  {
    // TODO
  }

  /**
   * Messaged when the user has altered the value for the item 
   * identified by path to newValue. If newValue signifies a truly new 
   * value the model should post a treeNodesChanged event.
   * This sets the user object of the TreeNode identified by 
   * path and posts a node changed. If you use custom user objects 
   * in the TreeModel you're going to need to subclass this and set 
   * the user object of the changed node to something meaningful.
   * 
   * @param path - path to the node that the user has altered
   * @param newValue - the new value from the TreeCellEditor
   */
  public void valueForPathChanged(TreePath path, Object newValue)
  {
    Object node = path.getLastPathComponent();
    if (node instanceof MutableTreeNode)
      {
        ((MutableTreeNode) node).setUserObject(newValue);
        int[] ci = null;
        Object[] c = null; 
        Object[] parentPath = path.getPath();
        if (path.getPathCount() > 1)
          {
            Object parent = ((TreeNode) node).getParent();
            ci = new int[1];
            ci[0] = getIndexOfChild(parent, node);
            node = newValue;
            path = path.getParentPath().pathByAddingChild(node);
            c = new Object[1];
            c[0] = node;
            parentPath = path.getParentPath().getPath();
          }