KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > caucho > amber > table > ForeignColumn


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.table;
30
31 import com.caucho.util.L10N;
32
33 /**
34  * Column linking to another table
35  */
36 public class ForeignColumn extends Column {
37   private static final L10N L = new L10N(ForeignColumn.class);
38
39   private Column _targetColumn;
40   
41   /**
42    * Creates a foreign column.
43    *
44    * @param table the owning table
45    * @param name the column name
46    * @param targetColumn the key column of the target table
47    */
48   ForeignColumn(Table table, String JavaDoc name, Column targetColumn)
49   {
50     super(table, name, targetColumn.getType());
51
52     _targetColumn = targetColumn;
53
54     if (! targetColumn.isPrimaryKey())
55       throw new IllegalStateException JavaDoc(L.l("Foreign column '{0}' of table '{1}' must be a primary key.",
56                       targetColumn.getName(),
57                       targetColumn.getTable().getName()));
58   }
59
60   /**
61    * Returns the target column.
62    */
63   public Column getTargetColumn()
64   {
65     return _targetColumn;
66   }
67
68   public String JavaDoc toString()
69   {
70     return "ForeignColumn[" + getName() + "," + _targetColumn + "]";
71   }
72 }
73
Popular Tags