001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.validator.routines;
018
019import java.text.DateFormat;
020import java.text.Format;
021import java.util.Calendar;
022import java.util.Locale;
023import java.util.TimeZone;
024
025/**
026 * <p><b>Time Validation</b> and Conversion routines (<code>java.util.Calendar</code>).</p>
027 *
028 * <p>This validator provides a number of methods for validating/converting
029 *    a <code>String</code> time value to a <code>java.util.Calendar</code> using
030 *    <code>java.text.DateFormat</code> to parse either:</p>
031 *    <ul>
032 *       <li>using the default format for the default <code>Locale</code></li>
033 *       <li>using a specified pattern with the default <code>Locale</code></li>
034 *       <li>using the default format for a specified <code>Locale</code></li>
035 *       <li>using a specified pattern with a specified <code>Locale</code></li>
036 *    </ul>
037 *
038 * <p>For each of the above mechanisms, conversion method (i.e the
039 *    <code>validate</code> methods) implementations are provided which
040 *    either use the default <code>TimeZone</code> or allow the
041 *    <code>TimeZone</code> to be specified.</p>
042 *
043 * <p>Use one of the <code>isValid()</code> methods to just validate or
044 *    one of the <code>validate()</code> methods to validate and receive a
045 *    <i>converted</i> <code>Calendar</code> value for the time.</p>
046 *
047 * <p>Implementations of the <code>validate()</code> method are provided
048 *    to create <code>Calendar</code> objects for different <i>time zones</i>
049 *    if the system default is not appropriate.</p>
050 *
051 * <p>Alternatively the CalendarValidator's <code>adjustToTimeZone()</code> method
052 *    can be used to adjust the <code>TimeZone</code> of the <code>Calendar</code>
053 *    object afterwards.</p>
054 *
055 * <p>Once a value has been successfully converted the following
056 *    methods can be used to perform various time comparison checks:</p>
057 *    <ul>
058 *       <li><code>compareTime()</code> compares the hours, minutes, seconds
059 *           and milliseconds of two calendars, returning 0, -1 or +1 indicating
060 *           whether the first time is equal, before or after the second.</li>
061 *       <li><code>compareSeconds()</code> compares the hours, minutes and
062 *           seconds of two times, returning 0, -1 or +1 indicating
063 *           whether the first is equal to, before or after the second.</li>
064 *       <li><code>compareMinutes()</code> compares the hours and minutes
065 *           two times, returning 0, -1 or +1 indicating
066 *           whether the first is equal to, before or after the second.</li>
067 *       <li><code>compareHours()</code> compares the hours
068 *           of two times, returning 0, -1 or +1 indicating
069 *           whether the first is equal to, before or after the second.</li>
070 *    </ul>
071 *
072 * <p>So that the same mechanism used for parsing an <i>input</i> value
073 *    for validation can be used to format <i>output</i>, corresponding
074 *    <code>format()</code> methods are also provided. That is you can
075 *    format either:</p>
076 *    <ul>
077 *       <li>using a specified pattern</li>
078 *       <li>using the format for a specified <code>Locale</code></li>
079 *       <li>using the format for the <i>default</i> <code>Locale</code></li>
080 *    </ul>
081 *
082 * @since 1.3.0
083 */
084public class TimeValidator extends AbstractCalendarValidator {
085
086    private static final long serialVersionUID = 3494007492269691581L;
087
088    private static final TimeValidator VALIDATOR = new TimeValidator();
089
090    /**
091     * Return a singleton instance of this validator.
092     * @return A singleton instance of the TimeValidator.
093     */
094    public static TimeValidator getInstance() {
095        return VALIDATOR;
096    }
097
098    /**
099     * Constructs a <i>strict</i> instance with <i>short</i>
100     * time style.
101     */
102    public TimeValidator() {
103        this(true, DateFormat.SHORT);
104    }
105
106    /**
107     * Constructs an instance with the specified <i>strict</i>
108     * and <i>time style</i> parameters.
109     *
110     * @param strict {@code true} if strict
111     *        <code>Format</code> parsing should be used.
112     * @param timeStyle the time style to use for Locale validation.
113     */
114    public TimeValidator(final boolean strict, final int timeStyle) {
115        super(strict, -1, timeStyle);
116    }
117
118    /**
119     * <p>Compare Hours.</p>
120     *
121     * @param value The <code>Calendar</code> value to check.
122     * @param compare The <code>Calendar</code> to compare the value to.
123     * @return Zero if the hours are equal, -1 if first
124     * parameter's hour is less than the seconds and +1 if the first
125     * parameter's hour is greater than.
126     */
127    public int compareHours(final Calendar value, final Calendar compare) {
128        return compareTime(value, compare, Calendar.HOUR_OF_DAY);
129    }
130
131    /**
132     * <p>Compare Minutes (hours and minutes).</p>
133     *
134     * @param value The <code>Calendar</code> value to check.
135     * @param compare The <code>Calendar</code> to compare the value to.
136     * @return Zero if the hours are equal, -1 if first
137     * parameter's minutes are less than the seconds and +1 if the first
138     * parameter's minutes are greater than.
139     */
140    public int compareMinutes(final Calendar value, final Calendar compare) {
141        return compareTime(value, compare, Calendar.MINUTE);
142    }
143
144    /**
145     * <p>Compare Seconds (hours, minutes and seconds).</p>
146     *
147     * @param value The <code>Calendar</code> value to check.
148     * @param compare The <code>Calendar</code> to compare the value to.
149     * @return Zero if the hours are equal, -1 if first
150     * parameter's seconds are less than the seconds and +1 if the first
151     * parameter's seconds are greater than.
152     */
153    public int compareSeconds(final Calendar value, final Calendar compare) {
154        return compareTime(value, compare, Calendar.SECOND);
155    }
156
157    /**
158     * <p>Compare Times (hour, minute, second and millisecond - not date).</p>
159     *
160     * @param value The <code>Calendar</code> value to check.
161     * @param compare The <code>Calendar</code> to compare the value to.
162     * @return Zero if the hours are equal, -1 if first
163     * time is less than the seconds and +1 if the first
164     * time is greater than.
165     */
166    public int compareTime(final Calendar value, final Calendar compare) {
167        return compareTime(value, compare, Calendar.MILLISECOND);
168    }
169
170    /**
171     * <p>Convert the parsed <code>Date</code> to a <code>Calendar</code>.</p>
172     *
173     * @param value The parsed <code>Date</code> object created.
174     * @param formatter The Format used to parse the value with.
175     * @return The parsed value converted to a <code>Calendar</code>.
176     */
177    @Override
178    protected Object processParsedValue(final Object value, final Format formatter) {
179        return ((DateFormat)formatter).getCalendar();
180    }
181
182    /**
183     * <p>Validate/convert a time using the default <code>Locale</code>
184     *    and <code>TimeZone</code>.
185     *
186     * @param value The value validation is being performed on.
187     * @return The parsed <code>Calendar</code> if valid or <code>null</code>
188     *  if invalid.
189     */
190    public Calendar validate(final String value) {
191        return (Calendar)parse(value, (String)null, (Locale)null, (TimeZone)null);
192    }
193
194    /**
195     * <p>Validate/convert a time using the specified <code>Locale</code>
196     *    default <code>TimeZone</code>.
197     *
198     * @param value The value validation is being performed on.
199     * @param locale The locale to use for the time format, system default if null.
200     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
201     */
202    public Calendar validate(final String value, final Locale locale) {
203        return (Calendar)parse(value, (String)null, locale, (TimeZone)null);
204    }
205
206    /**
207     * <p>Validate/convert a time using the specified <code>Locale</code>
208     *    and <code>TimeZone</code>.
209     *
210     * @param value The value validation is being performed on.
211     * @param locale The locale to use for the time format, system default if null.
212     * @param timeZone The Time Zone used to parse the time, system default if null.
213     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
214     */
215    public Calendar validate(final String value, final Locale locale, final TimeZone timeZone) {
216        return (Calendar)parse(value, (String)null, locale, timeZone);
217    }
218
219    /**
220     * <p>Validate/convert a time using the specified <i>pattern</i> and
221     *    default <code>TimeZone</code>.
222     *
223     * @param value The value validation is being performed on.
224     * @param pattern The pattern used to validate the value against.
225     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
226     */
227    public Calendar validate(final String value, final String pattern) {
228        return (Calendar)parse(value, pattern, (Locale)null, (TimeZone)null);
229    }
230
231    /**
232     * <p>Validate/convert a time using the specified pattern and <code>Locale</code>
233     *    and the default <code>TimeZone</code>.
234     *
235     * @param value The value validation is being performed on.
236     * @param pattern The pattern used to validate the value against, or the
237     *        default for the <code>Locale</code> if <code>null</code>.
238     * @param locale The locale to use for the date format, system default if null.
239     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
240     */
241    public Calendar validate(final String value, final String pattern, final Locale locale) {
242        return (Calendar)parse(value, pattern, locale, (TimeZone)null);
243    }
244
245    /**
246     * <p>Validate/convert a time using the specified pattern, <code>Locale</code>
247     *    and <code>TimeZone</code>.
248     *
249     * @param value The value validation is being performed on.
250     * @param pattern The pattern used to validate the value against, or the
251     *        default for the <code>Locale</code> if <code>null</code>.
252     * @param locale The locale to use for the date format, system default if null.
253     * @param timeZone The Time Zone used to parse the date, system default if null.
254     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
255     */
256    public Calendar validate(final String value, final String pattern, final Locale locale, final TimeZone timeZone) {
257        return (Calendar)parse(value, pattern, locale, timeZone);
258    }
259
260    /**
261     * <p>Validate/convert a time using the specified <i>pattern</i>
262     *    and <code>TimeZone</code>.
263     *
264     * @param value The value validation is being performed on.
265     * @param pattern The pattern used to validate the value against.
266     * @param timeZone The Time Zone used to parse the time, system default if null.
267     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
268     */
269    public Calendar validate(final String value, final String pattern, final TimeZone timeZone) {
270        return (Calendar)parse(value, pattern, (Locale)null, timeZone);
271    }
272
273    /**
274     * <p>Validate/convert a time using the specified <code>TimeZone</code>
275     *    and default <code>Locale</code>.
276     *
277     * @param value The value validation is being performed on.
278     * @param timeZone The Time Zone used to parse the time, system default if null.
279     * @return The parsed <code>Calendar</code> if valid or <code>null</code> if invalid.
280     */
281    public Calendar validate(final String value, final TimeZone timeZone) {
282        return (Calendar)parse(value, (String)null, (Locale)null, timeZone);
283    }
284}