1 /*
2 * $Source: /usr/cvsroot/melati/poem/src/main/java/org/melati/poem/FieldSet.java,v $
3 * $Revision: 1.15 $
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;
47
48 import java.util.Hashtable;
49 import java.util.Enumeration;
50 import org.melati.poem.util.ArrayEnumeration;
51
52 /**
53 * A set of {@link Field}s accessible in sequence or looked up
54 * using an encoding of the table name and column name.
55 */
56 public class FieldSet {
57
58 private Hashtable<String, Integer> table_columnMap;
59 private Field<?>[] fields;
60
61 /**
62 * Constructor.
63 * @param table_columnMap a Hashtable keyed on tablename underscore fieldname containing indices to fields
64 * @param fields an array of fields
65 */
66 public FieldSet(Hashtable<String, Integer> table_columnMap, Field<?>[] fields) {
67 this.table_columnMap = table_columnMap;
68 this.fields = fields;
69 }
70
71 /**
72 * @return an Enumeration of the fields
73 */
74 public Enumeration<Field<?>> elements() {
75 return new ArrayEnumeration<Field<?>>(fields);
76 }
77
78 /**
79 * Return a specified field.
80 *
81 * @param name The table name and column name separated by "_".
82 * @return a Field with given name or null
83 * @see TailoredResultSetEnumeration#mapped(java.sql.ResultSet)
84 */
85 public Field<?> get(String name) {
86 Integer f = (Integer)table_columnMap.get(name);
87 return f == null ? null : fields[f.intValue()];
88 }
89
90 /**
91 * Used to debug tests.
92 * {@inheritDoc}
93 * @see java.lang.Object#toString()
94 */
95 public String toString() {
96 if (fields != null) {
97 String result = "";
98 for (int i = 0; i< fields.length; i++) {
99 result += fields[i].getName();
100 result += "=\"";
101 result += fields[i].getCooked();
102 result += "\"";
103 result += "\n";
104 }
105 return result;
106 } else {
107 return null;
108 }
109
110 }
111 }