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Java > Open Source Codes > org > apache > pluto > portalImpl > util > ObjectID


1 /*
2  * Copyright 2003,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17
18  */
19
20 package org.apache.pluto.portalImpl.util;
21
22 import java.io.IOException JavaDoc;
23 import java.io.ObjectInputStream JavaDoc;
24 import java.io.ObjectOutputStream JavaDoc;
25
26 /**
27  ** Wraps around the internal Object IDs. By holding both
28  ** the string and the integer version of an Object ID this class
29  ** helps speed up the internal processing.
30  **/
31
32 public class ObjectID implements org.apache.pluto.om.common.ObjectID, java.io.Serializable JavaDoc
33 {
34
35     private String JavaDoc stringOID;
36     private int intOID;
37
38     private ObjectID (int oid, String JavaDoc stringOID)
39     {
40         this.stringOID = stringOID;
41         intOID = oid;
42     }
43
44     // internal methods.
45
46     private void readObject (ObjectInputStream JavaDoc stream) throws IOException JavaDoc, ClassNotFoundException JavaDoc
47     {
48         intOID = stream.readInt ();
49
50         stringOID = String.valueOf (intOID);
51     }
52
53     private void writeObject (ObjectOutputStream JavaDoc stream) throws IOException JavaDoc
54     {
55         stream.write (intOID);
56     }
57
58     
59     // addtional methods.
60
61     public boolean equals (Object JavaDoc object)
62     {
63         boolean result = false;
64
65         if (object instanceof ObjectID)
66             result = (intOID == ((ObjectID) object).intOID);
67         else if (object instanceof String JavaDoc)
68             result = stringOID.equals (object);
69         else if (object instanceof Integer JavaDoc)
70             result = (intOID == ((Integer JavaDoc)object).intValue());
71         return (result);
72     }
73
74     public int hashCode ()
75     {
76         return (intOID);
77     }
78
79     public String JavaDoc toString ()
80     {
81         return (stringOID);
82     }
83
84     public int intValue ()
85     {
86         return (intOID);
87     }
88
89     static public ObjectID createFromString(String JavaDoc idStr)
90     {
91         char[] id = idStr.toCharArray();
92         int _id = 1;
93         for (int i=0; i<id.length; i++)
94         {
95             if ((i%2)==0) _id *= id[i];
96             else _id ^= id[i];
97             _id = Math.abs(_id);
98         }
99         return new ObjectID(_id, idStr);
100     }
101 }
102
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