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Java > Open Source Codes > com > quadcap > sql > AddIndexEntry


1 package com.quadcap.sql;
2
3 /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.Externalizable JavaDoc;
42 import java.io.IOException JavaDoc;
43 import java.io.ObjectInput JavaDoc;
44 import java.io.ObjectOutput JavaDoc;
45
46 import java.sql.SQLException JavaDoc;
47
48 import com.quadcap.sql.file.ByteUtil;
49 import com.quadcap.sql.file.SubPageManager;
50
51 import com.quadcap.sql.io.Extern;
52
53 import com.quadcap.sql.index.Btree;
54
55 import com.quadcap.util.Util;
56
57 /**
58  * Log step to add a entry to an index.
59  *
60  * @author Stan Bailes
61  */
62 public class AddIndexEntry extends ModIndexEntry implements Externalizable JavaDoc {
63     long rowId;
64
65     /**
66      * Default constructor
67      */
68     public AddIndexEntry() {}
69
70     /**
71      * Explicit constructor from key and rowId
72      */
73     public AddIndexEntry(Session session, Constraint constraint,
74                          byte[] key, long rowId) {
75     super(session, constraint, key);
76     this.rowId = rowId;
77     }
78
79     /**
80      * LogStep.redo(): Store the new entry in the index
81      */
82     public void redo(Session session) throws IOException JavaDoc, SQLException JavaDoc {
83         if (index == null) {
84             getIndex(session);
85         }
86     if (session.getConnection().inRecovery()) {
87         rowId = session.getLog().getRowMap(rowId);
88     }
89         index.set(key, key.length, session.getBuf8(rowId), 0, 8);
90     }
91
92     /**
93      * LogStep.undo(): Remove the entry from the index
94      */
95     public void undo(Session session) throws IOException JavaDoc {
96         if (index == null) {
97             getIndex(session);
98         }
99     index.delete(key);
100     }
101
102     /**
103      * Externalizable: Read me from a stream
104      */
105     public void readExternal(ObjectInput JavaDoc in)
106     throws IOException JavaDoc, ClassNotFoundException JavaDoc
107     {
108     super.readExternal(in);
109     rowId = in.readLong();
110     }
111     
112     /**
113      * Externalizable: Write me to a stream
114      */
115     public void writeExternal(ObjectOutput JavaDoc out) throws IOException JavaDoc {
116     super.writeExternal(out);
117     out.writeLong(rowId);
118     }
119
120     /**
121      * My class's Extern object
122      */
123     static Extern extern;
124     public void setExtern(Extern extern) { AddIndexEntry.extern = extern; }
125     public Extern getExtern() { return extern; }
126
127     //#ifdef DEBUG
128 /**
129      * For debugging, return a string representation
130      */
131     public String JavaDoc toString() {
132     return "Add: " + super.toString() + ", rowId = " +
133         SubPageManager.toString(rowId);
134     }
135     //#endif
136
137 }
138
139     
140
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