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Java example source code file (SimpleTreeModel.java)

This example Java source code file (SimpleTreeModel.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, event, gui, iterator, jtree, object, simpletreemodel, simpletreenode, string, swing, tree, treemodelevent, treemodellistener, unsupportedoperationexception, util

The SimpleTreeModel.java Java example source code

/*
 * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.ui.tree;

import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;

/** A very simple tree model which allows the root to be set, so we
    can reuse the same model for various types of data; the
    specialization is contained within the nodes. This tree model
    operates on SimpleTreeNodes. */

public class SimpleTreeModel implements TreeModel {
  private static final SimpleTreeNode singletonNullRoot = new SimpleTreeNode() {
      public int getChildCount()                        { return 0;      }
      public SimpleTreeNode getChild(int index)         { return null;   }
      public boolean isLeaf()                           { return true;   }
      public int getIndexOfChild(SimpleTreeNode child)  { return 0;      }
      public String toString()                          { return ""; }
      public String getName()                           { return toString(); }
      public String getValue()                          { return toString(); }
    };
  private SimpleTreeNode root = singletonNullRoot;
  /** List<TreeModelListener> */
  private List listeners = new ArrayList();

  public void setRoot(SimpleTreeNode node) {
    if (node != null) {
      root = node;
    } else {
      root = singletonNullRoot;
    }
    fireTreeStructureChanged();
  }

  public Object getRoot() {
    return root;
  }

  public Object getChild(Object parent, int index) {
    return ((SimpleTreeNode) parent).getChild(index);
  }

  public int getChildCount(Object parent) {
    return ((SimpleTreeNode) parent).getChildCount();
  }

  public boolean isLeaf(Object node) {
    if (node == null) {
      return true;
    }
    return ((SimpleTreeNode) node).isLeaf();
  }

  /** Unsupported operation */
  public void valueForPathChanged(TreePath path, Object newValue) {
    throw new UnsupportedOperationException();
  }

  public int getIndexOfChild(Object parent, Object child) {
    return ((SimpleTreeNode) parent).getIndexOfChild((SimpleTreeNode) child);
  }

  public void addTreeModelListener(TreeModelListener l) {
    listeners.add(l);
  }

  public void removeTreeModelListener(TreeModelListener l) {
    listeners.remove(l);
  }

  public void fireTreeStructureChanged() {
    TreeModelEvent e = new TreeModelEvent(getRoot(), new Object[] { getRoot() }, null, null);
    for (Iterator iter = listeners.iterator(); iter.hasNext(); ) {
      TreeModelListener l = (TreeModelListener) iter.next();
      l.treeStructureChanged(e);
    }
  }
}

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