View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.validator.routines;
18  
19  import java.text.DateFormat;
20  import java.text.Format;
21  import java.util.Calendar;
22  import java.util.Locale;
23  import java.util.TimeZone;
24  
25  /**
26   * <p><b>Calendar Validation</b> and Conversion routines (<code>java.util.Calendar</code>).</p>
27   *
28   * <p>This validator provides a number of methods for validating/converting
29   *    a <code>String</code> date value to a <code>java.util.Calendar</code> using
30   *    <code>java.text.DateFormat</code> to parse either:</p>
31   *    <ul>
32   *       <li>using the default format for the default <code>Locale</code></li>
33   *       <li>using a specified pattern with the default <code>Locale</code></li>
34   *       <li>using the default format for a specified <code>Locale</code></li>
35   *       <li>using a specified pattern with a specified <code>Locale</code></li>
36   *    </ul>
37   *
38   * <p>For each of the above mechanisms, conversion method (i.e the
39   *    <code>validate</code> methods) implementations are provided which
40   *    either use the default <code>TimeZone</code> or allow the
41   *    <code>TimeZone</code> to be specified.</p>
42   *
43   * <p>Use one of the <code>isValid()</code> methods to just validate or
44   *    one of the <code>validate()</code> methods to validate and receive a
45   *    <i>converted</i> <code>Calendar</code> value.</p>
46   *
47   * <p>Implementations of the <code>validate()</code> method are provided
48   *    to create <code>Calendar</code> objects for different <i>time zones</i>
49   *    if the system default is not appropriate.</p>
50   *
51   * <p>Alternatively the CalendarValidator's <code>adjustToTimeZone()</code> method
52   *    can be used to adjust the <code>TimeZone</code> of the <code>Calendar</code>
53   *    object afterwards.</p>
54   *
55   * <p>Once a value has been successfully converted the following
56   *    methods can be used to perform various date comparison checks:</p>
57   *    <ul>
58   *       <li><code>compareDates()</code> compares the day, month and
59   *           year of two calendars, returning 0, -1 or +1 indicating
60   *           whether the first date is equal, before or after the second.</li>
61   *       <li><code>compareWeeks()</code> compares the week and
62   *           year of two calendars, returning 0, -1 or +1 indicating
63   *           whether the first week is equal, before or after the second.</li>
64   *       <li><code>compareMonths()</code> compares the month and
65   *           year of two calendars, returning 0, -1 or +1 indicating
66   *           whether the first month is equal, before or after the second.</li>
67   *       <li><code>compareQuarters()</code> compares the quarter and
68   *           year of two calendars, returning 0, -1 or +1 indicating
69   *           whether the first quarter is equal, before or after the second.</li>
70   *       <li><code>compareYears()</code> compares the
71   *           year of two calendars, returning 0, -1 or +1 indicating
72   *           whether the first year is equal, before or after the second.</li>
73   *    </ul>
74   *
75   * <p>So that the same mechanism used for parsing an <i>input</i> value
76   *    for validation can be used to format <i>output</i>, corresponding
77   *    <code>format()</code> methods are also provided. That is you can
78   *    format either:</p>
79   *    <ul>
80   *       <li>using a specified pattern</li>
81   *       <li>using the format for a specified <code>Locale</code></li>
82   *       <li>using the format for the <i>default</i> <code>Locale</code></li>
83   *    </ul>
84   *
85   * @since 1.3.0
86   */
87  public class CalendarValidator extends AbstractCalendarValidator {
88  
89      private static final long serialVersionUID = 9109652318762134167L;
90  
91      private static final CalendarValidator VALIDATOR = new CalendarValidator();
92  
93      /**
94       * <p>Adjusts a Calendar's value to a different TimeZone.</p>
95       *
96       * @param value The value to adjust.
97       * @param timeZone The new time zone to use to adjust the Calendar to.
98       */
99      public static void adjustToTimeZone(final Calendar value, final TimeZone timeZone) {
100         if (value.getTimeZone().hasSameRules(timeZone)) {
101             value.setTimeZone(timeZone);
102         } else {
103             final int year = value.get(Calendar.YEAR);
104             final int month = value.get(Calendar.MONTH);
105             final int date = value.get(Calendar.DATE);
106             final int hour = value.get(Calendar.HOUR_OF_DAY);
107             final int minute = value.get(Calendar.MINUTE);
108             value.setTimeZone(timeZone);
109             value.set(year, month, date, hour, minute);
110         }
111     }
112 
113     /**
114      * Return a singleton instance of this validator.
115      * @return A singleton instance of the CalendarValidator.
116      */
117     public static CalendarValidator getInstance() {
118         return VALIDATOR;
119     }
120 
121     /**
122      * Constructs a <i>strict</i> instance with <i>short</i>
123      * date style.
124      */
125     public CalendarValidator() {
126         this(true, DateFormat.SHORT);
127     }
128 
129     /**
130      * Constructs an instance with the specified <i>strict</i>
131      * and <i>date style</i> parameters.
132      *
133      * @param strict {@code true} if strict
134      *        <code>Format</code> parsing should be used.
135      * @param dateStyle the date style to use for Locale validation.
136      */
137     public CalendarValidator(final boolean strict, final int dateStyle) {
138         super(strict, dateStyle, -1);
139     }
140 
141     /**
142      * <p>Compare Dates (day, month and year - not time).</p>
143      *
144      * @param value The <code>Calendar</code> value to check.
145      * @param compare The <code>Calendar</code> to compare the value to.
146      * @return Zero if the dates are equal, -1 if first
147      * date is less than the seconds and +1 if the first
148      * date is greater than.
149      */
150     public int compareDates(final Calendar value, final Calendar compare) {
151         return compare(value, compare, Calendar.DATE);
152     }
153 
154     /**
155      * <p>Compare Months (month and year).</p>
156      *
157      * @param value The <code>Calendar</code> value to check.
158      * @param compare The <code>Calendar</code> to compare the value to.
159      * @return Zero if the months are equal, -1 if first
160      * parameter's month is less than the seconds and +1 if the first
161      * parameter's month is greater than.
162      */
163     public int compareMonths(final Calendar value, final Calendar compare) {
164         return compare(value, compare, Calendar.MONTH);
165     }
166 
167     /**
168      * <p>Compare Quarters (quarter and year).</p>
169      *
170      * @param value The <code>Calendar</code> value to check.
171      * @param compare The <code>Calendar</code> to check the value against.
172      * @return Zero if the quarters are equal, -1 if first
173      * parameter's quarter is less than the seconds and +1 if the first
174      * parameter's quarter is greater than.
175      */
176     public int compareQuarters(final Calendar value, final Calendar compare) {
177         return compareQuarters(value, compare, 1);
178     }
179 
180     /**
181      * <p>Compare Quarters (quarter and year).</p>
182      *
183      * @param value The <code>Calendar</code> value to check.
184      * @param compare The <code>Calendar</code> to compare the value to.
185      * @param monthOfFirstQuarter The  month that the first quarter starts.
186      * @return Zero if the quarters are equal, -1 if first
187      * parameter's quarter is less than the seconds and +1 if the first
188      * parameter's quarter is greater than.
189      */
190     @Override
191     public int compareQuarters(final Calendar value, final Calendar compare, final int monthOfFirstQuarter) {
192         return super.compareQuarters(value, compare, monthOfFirstQuarter);
193     }
194 
195     /**
196      * <p>Compare Weeks (week and year).</p>
197      *
198      * @param value The <code>Calendar</code> value to check.
199      * @param compare The <code>Calendar</code> to compare the value to.
200      * @return Zero if the weeks are equal, -1 if first
201      * parameter's week is less than the seconds and +1 if the first
202      * parameter's week is greater than.
203      */
204     public int compareWeeks(final Calendar value, final Calendar compare) {
205         return compare(value, compare, Calendar.WEEK_OF_YEAR);
206     }
207 
208     /**
209      * <p>Compare Years.</p>
210      *
211      * @param value The <code>Calendar</code> value to check.
212      * @param compare The <code>Calendar</code> to compare the value to.
213      * @return Zero if the years are equal, -1 if first
214      * parameter's year is less than the seconds and +1 if the first
215      * parameter's year is greater than.
216      */
217     public int compareYears(final Calendar value, final Calendar compare) {
218         return compare(value, compare, Calendar.YEAR);
219     }
220 
221     /**
222      * <p>Convert the parsed <code>Date</code> to a <code>Calendar</code>.</p>
223      *
224      * @param value The parsed <code>Date</code> object created.
225      * @param formatter The Format used to parse the value with.
226      * @return The parsed value converted to a <code>Calendar</code>.
227      */
228     @Override
229     protected Object processParsedValue(final Object value, final Format formatter) {
230         return ((DateFormat)formatter).getCalendar();
231     }
232 
233     /**
234      * <p>Validate/convert a <code>Calendar</code> using the default
235      *    <code>Locale</code> and <code>TimeZone</code>.
236      *
237      * @param value The value validation is being performed on.
238      * @return The parsed <code>Calendar</code> if valid or <code>null</code>
239      *  if invalid.
240      */
241     public Calendar validate(final String value) {
242         return (Calendar)parse(value, (String)null, (Locale)null, (TimeZone)null);
243     }
244 
245     /**
246      * <p>Validate/convert a <code>Calendar</code> using the specified
247      *    <code>Locale</code> and default <code>TimeZone</code>.
248      *
249      * @param value The value validation is being performed on.
250      * @param locale The locale to use for the date format, system default if null.
251      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
252      */
253     public Calendar validate(final String value, final Locale locale) {
254         return (Calendar)parse(value, (String)null, locale, (TimeZone)null);
255     }
256 
257     /**
258      * <p>Validate/convert a <code>Calendar</code> using the specified
259      *    <code>Locale</code> and <code>TimeZone</code>.
260      *
261      * @param value The value validation is being performed on.
262      * @param locale The locale to use for the date format, system default if null.
263      * @param timeZone The Time Zone used to parse the date, system default if null.
264      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
265      */
266     public Calendar validate(final String value, final Locale locale, final TimeZone timeZone) {
267         return (Calendar)parse(value, (String)null, locale, timeZone);
268     }
269 
270     /**
271      * <p>Validate/convert a <code>Calendar</code> using the specified
272      *    <i>pattern</i> and default <code>TimeZone</code>.
273      *
274      * @param value The value validation is being performed on.
275      * @param pattern The pattern used to validate the value against.
276      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
277      */
278     public Calendar validate(final String value, final String pattern) {
279         return (Calendar)parse(value, pattern, (Locale)null, (TimeZone)null);
280     }
281 
282     /**
283      * <p>Validate/convert a <code>Calendar</code> using the specified pattern
284      *    and <code>Locale</code> and the default <code>TimeZone</code>.
285      *
286      * @param value The value validation is being performed on.
287      * @param pattern The pattern used to validate the value against, or the
288      *        default for the <code>Locale</code> if <code>null</code>.
289      * @param locale The locale to use for the date format, system default if null.
290      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
291      */
292     public Calendar validate(final String value, final String pattern, final Locale locale) {
293         return (Calendar)parse(value, pattern, locale, (TimeZone)null);
294     }
295 
296     /**
297      * <p>Validate/convert a <code>Calendar</code> using the specified
298      *    pattern, and <code>Locale</code> and <code>TimeZone</code>.
299      *
300      * @param value The value validation is being performed on.
301      * @param pattern The pattern used to validate the value against, or the
302      *        default for the <code>Locale</code> if <code>null</code>.
303      * @param locale The locale to use for the date format, system default if null.
304      * @param timeZone The Time Zone used to parse the date, system default if null.
305      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
306      */
307     public Calendar validate(final String value, final String pattern, final Locale locale, final TimeZone timeZone) {
308         return (Calendar)parse(value, pattern, locale, timeZone);
309     }
310 
311     /**
312      * <p>Validate/convert a <code>Calendar</code> using the specified
313      *    <i>pattern</i> and <code>TimeZone</code>.
314      *
315      * @param value The value validation is being performed on.
316      * @param pattern The pattern used to validate the value against.
317      * @param timeZone The Time Zone used to parse the date, system default if null.
318      * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
319      */
320     public Calendar validate(final String value, final String pattern, final TimeZone timeZone) {
321         return (Calendar)parse(value, pattern, (Locale)null, timeZone);
322     }
323 
324     /**
325      * <p>Validate/convert a <code>Calendar</code> using the specified
326      *    <code>TimeZone</code> and default <code>Locale</code>.
327      *
328      * @param value The value validation is being performed on.
329      * @param timeZone The Time Zone used to parse the date, system default if null.
330      * @return The parsed <code>Calendar</code> if valid or <code>null</code>
331      *  if invalid.
332      */
333     public Calendar validate(final String value, final TimeZone timeZone) {
334         return (Calendar)parse(value, (String)null, (Locale)null, timeZone);
335     }
336 
337 }