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Java > Open Source Codes > com > caucho > amber > entity > EntityKey


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free Software Foundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.amber.entity;
30
31 import com.caucho.amber.type.EntityType;
32
33 /**
34  * Key to handle the merged identity hash code.
35  */
36 public class EntityKey {
37   private EntityType _rootType;
38   private Object JavaDoc _key;
39
40   public EntityKey()
41   {
42   }
43
44   public EntityKey(EntityType rootType, Object JavaDoc key)
45   {
46     _rootType = rootType;
47     _key = key;
48   }
49
50   public void init(EntityType rootType, Object JavaDoc key)
51   {
52     _rootType = rootType;
53     _key = key;
54   }
55
56   /**
57    * Returns the home value.
58    */
59   public EntityType getEntityType()
60   {
61     return _rootType;
62   }
63
64   /**
65    * Returns the key
66    */
67   public Object JavaDoc getKey()
68   {
69     return _key;
70   }
71
72   /**
73    * Returns the hash.
74    */
75   public int hashCode()
76   {
77     return 65521 * System.identityHashCode(_rootType) + _key.hashCode();
78   }
79
80   /**
81    * Returns equality.
82    */
83   public boolean equals(Object JavaDoc o)
84   {
85     if (this == o)
86       return true;
87
88     if (o == null || getClass() != o.getClass())
89       return false;
90
91     EntityKey key = (EntityKey) o;
92
93     return _rootType == key._rootType && _key.equals(key._key);
94   }
95     
96   public String JavaDoc toString()
97   {
98     return "EntityKey[" + _rootType + ", " + _key + "]";
99   }
100 }
101
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