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Java > Open Source Codes > jegg > type > TypeTree


1 /*
2  * Copyright (c) 2004, Bruce Lowery
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * - Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * - Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * - Neither the name of JEGG nor the names of its contributors may be used
14  * to endorse or promote products derived from this software without
15  * specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27  * POSSIBILITY OF SUCH DAMAGE.
28  */
29 package jegg.type;
30
31 import java.util.Iterator JavaDoc;
32
33 /**
34  * This class is used to hold a tree of related types. The root of the tree
35  * (usually class Object) is the most common type, and its children are the
36  * next least derived types, etc. Classes on different branches are not
37  * directly related through inheritance, although they inherit from a
38  * common ancestor.
39  */
40 public class TypeTree
41 {
42     private Node root = new Node(Object JavaDoc.class,null);
43     
44     public TypeTree()
45     {
46         super();
47     }
48     
49     public Node find(Class JavaDoc c)
50     {
51         return root.findNearest(c);
52     }
53     
54     public Node getRoot()
55     {
56         return root;
57     }
58     
59     public void insert(Class JavaDoc c, Object JavaDoc cookie)
60     {
61         if (Object JavaDoc.class.equals(c))
62         {
63             if (null == root.getCookie())
64             {
65                 root.setCookie(cookie);
66             }
67         }
68         else
69         {
70             Node nd = new Node(c,cookie);
71             if (!root.insert(nd))
72             {
73                 if (!nd.insert(root))
74                 {
75                     throw new IllegalStateException JavaDoc("unable to insert class "+c.getName());
76                 }
77             }
78         }
79     }
80     
81     public Iterator JavaDoc iterator()
82     {
83         return new TypeTreeIterator(this,true);
84     }
85 }
86
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