/* * Copyright (c) 1997, 2013, 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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 javax.swing.tree; import java.util.Enumeration; /** * Defines the requirements for an object that can be used as a * tree node in a JTree. *
* Implementations of TreeNode
that override equals
* will typically need to override hashCode
as well. Refer
* to {@link javax.swing.tree.TreeModel} for more information.
*
* For further information and examples of using tree nodes,
* see How to Use Tree Nodes
* in The Java Tutorial.
*
* @author Rob Davis
* @author Scott Violet
*/
public interface TreeNode
{
/**
* Returns the child TreeNode
at index
* childIndex
.
*
* @param childIndex index of child
* @return the child node at given index
*/
TreeNode getChildAt(int childIndex);
/**
* Returns the number of children TreeNode
s the receiver
* contains.
*
* @return the number of children the receiver contains
*/
int getChildCount();
/**
* Returns the parent TreeNode
of the receiver.
*
* @return the parent of the receiver
*/
TreeNode getParent();
/**
* Returns the index of node
in the receivers children.
* If the receiver does not contain node
, -1 will be
* returned.
*
* @param node node to be loked for
* @return index of specified node
*/
int getIndex(TreeNode node);
/**
* Returns true if the receiver allows children.
*
* @return whether the receiver allows children
*/
boolean getAllowsChildren();
/**
* Returns true if the receiver is a leaf.
*
* @return whether the receiver is a leaf
*/
boolean isLeaf();
/**
* Returns the children of the receiver as an Enumeration
.
*
* @return the children of the receiver as an {@code Enumeration}
*/
Enumeration extends TreeNode> children();
}