Source Code Cross Referenced for TreeWalker.java in  » Forum » nemesis-forum » org » nemesis » forum » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Forum » nemesis forum » org.nemesis.forum 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * NEMESIS-FORUM.
03:         * Copyright (C) 2002  David Laurent(lithium2@free.fr). All rights reserved.
04:         * 
05:         * Copyright (c) 2000 The Apache Software Foundation. All rights reserved.
06:         * 
07:         * Copyright (C) 2001 Yasna.com. All rights reserved.
08:         * 
09:         * Copyright (C) 2000 CoolServlets.com. All rights reserved.
10:         * 
11:         * NEMESIS-FORUM. is free software; you can redistribute it and/or
12:         * modify it under the terms of the Apache Software License, Version 1.1,
13:         * or (at your option) any later version.
14:         * 
15:         * NEMESIS-FORUM core framework, NEMESIS-FORUM backoffice, NEMESIS-FORUM frontoffice
16:         * application are parts of NEMESIS-FORUM and are distributed under
17:         * same terms of licence.
18:         * 
19:         * 
20:         * NEMESIS-FORUM includes software developed by the Apache Software Foundation (http://www.apache.org/)
21:         * and software developed by CoolServlets.com (http://www.coolservlets.com).
22:         * and software developed by Yasna.com (http://www.yasna.com).
23:         * 
24:         */
25:
26:        package org.nemesis.forum;
27:
28:        /**
29:         * Allows hierarchical navigation of a Thread. It closely follows the
30:         * TreeModel interface in Swing in the hopes of being easier to use.
31:         *
32:         * @see ForumThread
33:         */
34:        public interface TreeWalker {
35:
36:            /**
37:             * Returns the root of the tree. Returns null only if the tree has no nodes.
38:             *
39:             * @returns the root of the tree
40:             */
41:            public Message getRoot();
42:
43:            /**
44:             * Returns the child of parent at index index in the parent's child array.
45:             * This should not return null if index is a valid index for parent (that
46:             * is index >= 0 && index < getChildCount(parent)).
47:             *
48:             * @param parent the parent message.
49:             * @param index the index of the child.
50:             * @returns the child of parent at index.
51:             */
52:            public Message getChild(Message parent, int index);
53:
54:            /**
55:             * Returns the number of children of parent. Returns 0 if the node is a
56:             * leaf or if it has no children.
57:             *
58:             * @param parent a node in the tree, obtained from this data source.
59:             * @returns the number of children of the node parent.
60:             */
61:            public int getChildCount(Message parent);
62:
63:            /**
64:             * Returns the total number of recursive children of a parent. Returns 0
65:             * if there are no children. This method is not intended to aid in
66:             * navigation of a Thread but is included as an added utility.
67:             */
68:            public int getRecursiveChildCount(Message parent);
69:
70:            /**
71:             * Returns the index of child in parent.
72:             */
73:            public int getIndexOfChild(Message parent, Message child);
74:
75:            /**
76:             * Returns true if node is a leaf. A node is a leaf when it has no children
77:             * messages.
78:             *
79:             * @param node a node in the tree, obtained from this data source
80:             * @returns true if node is a leaf
81:             */
82:            public boolean isLeaf(Message node);
83:        }
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