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Java > Open Source Codes > com > quadcap > sql > meta > MetaTables


1 package com.quadcap.sql.meta;
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.IOException JavaDoc;
42
43 import java.util.Iterator JavaDoc;
44 import java.util.Vector JavaDoc;
45
46 import java.sql.SQLException JavaDoc;
47
48 import com.quadcap.sql.Column;
49 import com.quadcap.sql.Database;
50 import com.quadcap.sql.Expression;
51 import com.quadcap.sql.Relation;
52 import com.quadcap.sql.Row;
53 import com.quadcap.sql.Session;
54 import com.quadcap.sql.Table;
55 import com.quadcap.sql.View;
56
57 import com.quadcap.sql.index.BCursor;
58 import com.quadcap.sql.index.Btree;
59
60 import com.quadcap.sql.types.*;
61
62 import com.quadcap.util.Debug;
63
64 /**
65  * A Cursor supporting the <code>getTables</code> function.
66  *
67  * @author Stan Bailes
68  */
69 public class MetaTables extends MetaCursor {
70     static Column[] cols = {
71     new Column("TABLE_CAT", typeString),
72     new Column("TABLE_SCHEM", typeString),
73     new Column("TABLE_NAME", typeString),
74     new Column("TABLE_TYPE", typeString),
75     new Column("REMARKS", typeString)
76     };
77
78     static int[] sortColumns = { 4, 2, 3 };
79
80     public MetaTables(Session session, Expression predicate)
81     throws SQLException JavaDoc
82     {
83     super(session, predicate);
84     try {
85         addColumns(cols);
86         Database db = session.getDatabase();
87             session.getTableWriteLock("#Schema");
88             synchronized (db.getFile().getLock()) {
89                 Iterator JavaDoc iter = db.getRelationNameIterator();
90                 while (iter.hasNext()) {
91                     String JavaDoc name = (String JavaDoc)iter.next();
92                 
93                     Relation r = db.getRelation(name);
94                     Row row = makeRow(r);
95                     if (rowMatch(row)) {
96                         addRow(row);
97                     }
98                 }
99             }
100         sort();
101     } catch (ValueException e) {
102         Debug.print(e);
103         SQLException JavaDoc te = new SQLException JavaDoc(e.toString(), "Q000P");
104         te.setNextException(e);
105         throw te;
106     } catch (IOException JavaDoc e) {
107         Debug.print(e);
108         throw new SQLException JavaDoc(e.toString(), "Q000Q");
109     }
110     }
111
112     public int[] getSortColumns() {
113     return sortColumns;
114     }
115     
116     Row makeRow(Relation r) throws SQLException JavaDoc {
117     Row row = new Row(5);
118     row.set(1, ValueNull.valueNull);
119     doTableName(2, row, r.getName());
120     row.set(4, new ValueString(r.getType()));
121         if (r instanceof View) {
122             row.set(5, new ValueString(((View)r).toString()));
123         } else {
124             row.set(5, ValueNull.valueNull);
125         }
126     return row;
127     }
128
129 }
130
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