1 /*
2 * This file is part of *** M y C o R e ***
3 * See http://www.mycore.de/ for details.
4 *
5 * MyCoRe is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * MyCoRe is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with MyCoRe. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 package org.mycore.frontend.xeditor.validation;
20
21 import java.text.ParsePosition;
22 import java.text.SimpleDateFormat;
23 import java.util.ArrayList;
24 import java.util.Date;
25 import java.util.List;
26 import java.util.Locale;
27
28 import org.mycore.common.MCRException;
29
30 /**
31 * Helper for date validators to convert string input into a date value.
32 *
33 * @author Frank L\u00FCtzenkirchen
34 */
35 public class MCRDateConverter {
36
37 private static final Date CHECK_DATE = new Date(0L);
38
39 private List<SimpleDateFormat> formats = new ArrayList<>();
40
41 /**
42 * @param patterns a list of allowed SimpleDateFormat patterns separated by ";"
43 */
44 public MCRDateConverter(String patterns) {
45 for (String pattern : patterns.split(";")) {
46 formats.add(getDateFormat(pattern.trim()));
47 }
48 }
49
50 protected SimpleDateFormat getDateFormat(String pattern) {
51 SimpleDateFormat df = new SimpleDateFormat(pattern, Locale.ROOT);
52 df.setLenient(false);
53 return df;
54 }
55
56 /**
57 *
58 * @param input the text string
59 * @return the parsed Date matching one of the allowed date patterns, or null if the text can not be parsed
60 */
61 public Date string2date(String input) throws MCRException {
62 for (SimpleDateFormat format : formats) {
63 if (format.format(CHECK_DATE).length() != input.length()) {
64 continue;
65 }
66 try {
67 ParsePosition pp = new ParsePosition(0);
68 Date value = format.parse(input, pp);
69 if (pp.getIndex() == input.length()) {
70 return value;
71 }
72 } catch (Exception ignored) {
73 }
74 }
75
76 return null;
77 }
78 }