1 package org.apache.torque.engine.database.model;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Turbine" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Turbine", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.util.List;
58
59 /***
60 * Information about unique columns of a table. This class assumes
61 * that in the underlying RDBMS, unique constraints and unique indices
62 * are roughly equivalent. For example, adding a unique constraint to
63 * a column also creates an index on that column (this is known to be
64 * true for MySQL and Oracle).
65 *
66 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
67 * @author <a href="mailto:dlr@collab.net">Daniel Rall</a>
68 * @version $Id: Unique.java,v 1.1 2003/02/10 13:20:58 mpoeschl Exp $
69 */
70 public class Unique extends Index
71 {
72 /***
73 * Returns <code>true</code>.
74 *
75 * @return true
76 */
77 public final boolean isUnique()
78 {
79 return true;
80 }
81
82 /***
83 * String representation of the index. This is an xml representation.
84 *
85 * @return string representation in xml
86 */
87 public String toString()
88 {
89 StringBuffer result = new StringBuffer();
90 result.append(" <unique name=\"")
91 .append(getName())
92 .append("\">\n");
93
94 List columns = getColumns();
95 for (int i = 0; i < columns.size(); i++)
96 {
97 result.append(" <unique-column name=\"")
98 .append(columns.get(i))
99 .append("\"/>\n");
100 }
101 result.append(" </unique>\n");
102 return result.toString();
103 }
104 }
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