01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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 name, Column targetColumn) {
49: super (table, name, targetColumn.getType());
50:
51: _targetColumn = targetColumn;
52:
53: if (!targetColumn.isPrimaryKey())
54: throw new IllegalStateException(
55: L
56: .l(
57: "Foreign column '{0}' of table '{1}' must be a primary key.",
58: targetColumn.getName(),
59: targetColumn.getTable().getName()));
60: }
61:
62: /**
63: * Returns the target column.
64: */
65: public Column getTargetColumn() {
66: return _targetColumn;
67: }
68:
69: public String toString() {
70: return "ForeignColumn[" + getName() + "," + _targetColumn + "]";
71: }
72: }
|