1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 William Chesters
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * William Chesters <williamc At paneris.org>
42 * http://paneris.org/~williamc
43 * Obrechtstraat 114, 2517VX Den Haag, The Netherlands
44 */
45
46 package org.melati.poem.prepro;
47
48 import java.io.StreamTokenizer;
49 import java.io.IOException;
50
51 /**
52 * A <tt>FieldQualifier</tt> which defines the type of
53 * <tt>IntegrityFix</tt> to use with a reference field.
54 *
55 */
56 public class IntegrityfixFieldQualifier extends FieldQualifier {
57
58 private String integrityfix;
59
60 /**
61 * Constructor.
62 *
63 * @param tokens the <code>StreamTokenizer</code> to get tokens from
64 *
65 * @throws ParsingDSDException if an unexpected token is encountered
66 * @throws IOException if something goes wrong with the file system
67 */
68 public IntegrityfixFieldQualifier(StreamTokenizer tokens)
69 throws ParsingDSDException, IOException {
70 DSD.expect(tokens, '=');
71 tokens.nextToken();
72 if (tokens.ttype != StreamTokenizer.TT_WORD)
73 throw new ParsingDSDException("<integrity fix name>", tokens);
74 integrityfix = validIntegrityFixNamed(tokens.sval);
75
76 tokens.nextToken();
77 }
78
79 /**
80 * Check fix name.
81 * @param sval fix name
82 * @return validated fix name
83 */
84 private String validIntegrityFixNamed(String sval) {
85 if (sval.equals("delete") ||
86 sval.equals("clear") ||
87 sval.equals("prevent"))
88 return sval;
89 else
90 throw new ParsingDSDException("<integrity fix name>: one of delete, clear or prevent", sval);
91 }
92
93 /**
94 * Thrown when an attempt is made to apply an <code>IntegrityFix</code>
95 * to a field which is not a <code>ReferencePoemType</code>.
96 */
97 public static class ApplicationException extends IllegalityException {
98 private static final long serialVersionUID = 1L;
99
100 ApplicationException(FieldDef field) {
101 this.field = field;
102 this.lineNumber = field.lineNumber;
103 this.message = "The column " + field + " cannot have an `integrityfix' " +
104 "because that only applies to references";
105 }
106 }
107
108 /**
109 * Update the model.
110 *
111 * @param field the {@link FieldDef} to update
112 *
113 * @throws IllegalityException if there is a semantic contractiction
114 */
115 public void apply(FieldDef field) throws IllegalityException {
116 if (field instanceof ReferenceFieldDef)
117 ((ReferenceFieldDef)field).setIntegrityFix(integrityfix);
118 else if (field instanceof StringKeyReferenceFieldDef)
119 ((StringKeyReferenceFieldDef)field).setIntegrityFix(integrityfix);
120 else
121 throw new ApplicationException(field);
122 }
123 }