001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
022 * USA.
023 *
024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * ------------
028 * Quarter.java
029 * ------------
030 * (C) Copyright 2001-present, by David Gilbert.
031 *
032 * Original Author:  David Gilbert;
033 * Contributor(s):   -;
034 *
035 */
036
037package org.jfree.data.time;
038
039import java.io.Serializable;
040import java.util.Calendar;
041import java.util.Date;
042import java.util.Locale;
043import java.util.TimeZone;
044import org.jfree.chart.date.MonthConstants;
045import org.jfree.chart.date.SerialDate;
046
047/**
048 * Defines a quarter (in a given year).  The range supported is Q1 1900 to
049 * Q4 9999.  This class is immutable, which is a requirement for all
050 * {@link RegularTimePeriod} subclasses.
051 */
052public class Quarter extends RegularTimePeriod implements Serializable {
053
054    /** For serialization. */
055    private static final long serialVersionUID = 3810061714380888671L;
056
057    /** Constant for quarter 1. */
058    public static final int FIRST_QUARTER = 1;
059
060    /** Constant for quarter 4. */
061    public static final int LAST_QUARTER = 4;
062
063    /** The first month in each quarter. */
064    public static final int[] FIRST_MONTH_IN_QUARTER = {
065        0, MonthConstants.JANUARY, MonthConstants.APRIL, MonthConstants.JULY,
066        MonthConstants.OCTOBER
067    };
068
069    /** The last month in each quarter. */
070    public static final int[] LAST_MONTH_IN_QUARTER = {
071        0, MonthConstants.MARCH, MonthConstants.JUNE, MonthConstants.SEPTEMBER,
072        MonthConstants.DECEMBER
073    };
074
075    /** The year in which the quarter falls. */
076    private short year;
077
078    /** The quarter (1-4). */
079    private byte quarter;
080
081    /** The first millisecond. */
082    private long firstMillisecond;
083
084    /** The last millisecond. */
085    private long lastMillisecond;
086
087    /**
088     * Constructs a new Quarter, based on the current system date/time.
089     * The time zone and locale are determined by the calendar
090     * returned by {@link RegularTimePeriod#getCalendarInstance()}.
091     */
092    public Quarter() {
093        this(new Date());
094    }
095
096    /**
097     * Constructs a new quarter.
098     * The time zone and locale are determined by the calendar
099     * returned by {@link RegularTimePeriod#getCalendarInstance()}.
100     *
101     * @param year  the year (1900 to 9999).
102     * @param quarter  the quarter (1 to 4).
103     */
104    public Quarter(int quarter, int year) {
105        if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
106            throw new IllegalArgumentException("Quarter outside valid range.");
107        }
108        this.year = (short) year;
109        this.quarter = (byte) quarter;
110        peg(getCalendarInstance());
111    }
112
113    /**
114     * Constructs a new quarter.
115     * The time zone and locale are determined by the calendar
116     * returned by {@link RegularTimePeriod#getCalendarInstance()}.
117     *
118     * @param quarter  the quarter (1 to 4).
119     * @param year  the year (1900 to 9999).
120     */
121    public Quarter(int quarter, Year year) {
122        if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
123            throw new IllegalArgumentException("Quarter outside valid range.");
124        }
125        this.year = (short) year.getYear();
126        this.quarter = (byte) quarter;
127        peg(getCalendarInstance());
128    }
129
130    /**
131     * Constructs a new instance, based on a date/time.
132     * The time zone and locale are determined by the calendar
133     * returned by {@link RegularTimePeriod#getCalendarInstance()}.
134     *
135     * @param time  the date/time ({@code null} not permitted).
136     *
137     * @see #Quarter(Date, TimeZone, Locale)
138     */
139    public Quarter(Date time) {
140        this(time, getCalendarInstance());
141    }
142
143    /**
144     * Creates a new {@code Quarter} instance, using the specified
145     * zone and locale.
146     *
147     * @param time  the current time.
148     * @param zone  the time zone.
149     * @param locale  the locale.
150     */
151    public Quarter(Date time, TimeZone zone, Locale locale) {
152        Calendar calendar = Calendar.getInstance(zone, locale);
153        calendar.setTime(time);
154        int month = calendar.get(Calendar.MONTH) + 1;
155        this.quarter = (byte) SerialDate.monthCodeToQuarter(month);
156        this.year = (short) calendar.get(Calendar.YEAR);
157        peg(calendar);
158    }
159
160    /**
161     * Constructs a new instance, based on a particular date/time.
162     * The time zone and locale are determined by the {@code calendar}
163     * parameter.
164     *
165     * @param time the date/time ({@code null} not permitted).
166     * @param calendar the calendar to use for calculations ({@code null} not permitted).
167     */
168    public Quarter(Date time, Calendar calendar) {
169        calendar.setTime(time);
170        int month = calendar.get(Calendar.MONTH) + 1;
171        this.quarter = (byte) SerialDate.monthCodeToQuarter(month);
172        this.year = (short) calendar.get(Calendar.YEAR);
173        peg(calendar);
174    }
175
176    /**
177     * Returns the quarter.
178     *
179     * @return The quarter.
180     */
181    public int getQuarter() {
182        return this.quarter;
183    }
184
185    /**
186     * Returns the year.
187     *
188     * @return The year.
189     */
190    public Year getYear() {
191        return new Year(this.year);
192    }
193
194    /**
195     * Returns the year.
196     *
197     * @return The year.
198     */
199    public int getYearValue() {
200        return this.year;
201    }
202
203    /**
204     * Returns the first millisecond of the quarter.  This will be determined
205     * relative to the time zone specified in the constructor, or in the
206     * calendar instance passed in the most recent call to the
207     * {@link #peg(Calendar)} method.
208     *
209     * @return The first millisecond of the quarter.
210     *
211     * @see #getLastMillisecond()
212     */
213    @Override
214    public long getFirstMillisecond() {
215        return this.firstMillisecond;
216    }
217
218    /**
219     * Returns the last millisecond of the quarter.  This will be
220     * determined relative to the time zone specified in the constructor, or
221     * in the calendar instance passed in the most recent call to the
222     * {@link #peg(Calendar)} method.
223     *
224     * @return The last millisecond of the quarter.
225     *
226     * @see #getFirstMillisecond()
227     */
228    @Override
229    public long getLastMillisecond() {
230        return this.lastMillisecond;
231    }
232
233    /**
234     * Recalculates the start date/time and end date/time for this time period
235     * relative to the supplied calendar (which incorporates a time zone).
236     *
237     * @param calendar  the calendar ({@code null} not permitted).
238     */
239    @Override
240    public void peg(Calendar calendar) {
241        this.firstMillisecond = getFirstMillisecond(calendar);
242        this.lastMillisecond = getLastMillisecond(calendar);
243    }
244
245    /**
246     * Returns the quarter preceding this one.
247     * No matter what time zone and locale this instance was created with,
248     * the returned instance will use the default calendar for time
249     * calculations, obtained with {@link RegularTimePeriod#getCalendarInstance()}.
250     *
251     * @return The quarter preceding this one (or {@code null} if this is
252     *     Q1 1900).
253     */
254    @Override
255    public RegularTimePeriod previous() {
256        Quarter result;
257        if (this.quarter > FIRST_QUARTER) {
258            result = new Quarter(this.quarter - 1, this.year);
259        }
260        else {
261            if (this.year > 1900) {
262                result = new Quarter(LAST_QUARTER, this.year - 1);
263            }
264            else {
265                result = null;
266            }
267        }
268        return result;
269    }
270
271    /**
272     * Returns the quarter following this one.
273     * No matter what time zone and locale this instance was created with,
274     * the returned instance will use the default calendar for time
275     * calculations, obtained with {@link RegularTimePeriod#getCalendarInstance()}.
276     *
277     * @return The quarter following this one (or null if this is Q4 9999).
278     */
279    @Override
280    public RegularTimePeriod next() {
281        Quarter result;
282        if (this.quarter < LAST_QUARTER) {
283            result = new Quarter(this.quarter + 1, this.year);
284        }
285        else {
286            if (this.year < 9999) {
287                result = new Quarter(FIRST_QUARTER, this.year + 1);
288            }
289            else {
290                result = null;
291            }
292        }
293        return result;
294    }
295
296    /**
297     * Returns a serial index number for the quarter.
298     *
299     * @return The serial index number.
300     */
301    @Override
302    public long getSerialIndex() {
303        return this.year * 4L + this.quarter;
304    }
305
306    /**
307     * Tests the equality of this Quarter object to an arbitrary object.
308     * Returns {@code true} if the target is a Quarter instance
309     * representing the same quarter as this object.  In all other cases,
310     * returns {@code false}.
311     *
312     * @param obj  the object ({@code null} permitted).
313     *
314     * @return {@code true} if quarter and year of this and the object are
315     *         the same.
316     */
317    @Override
318    public boolean equals(Object obj) {
319
320        if (obj != null) {
321            if (obj instanceof Quarter) {
322                Quarter target = (Quarter) obj;
323                return (this.quarter == target.getQuarter()
324                        && (this.year == target.getYearValue()));
325            }
326            else {
327                return false;
328            }
329        }
330        else {
331            return false;
332        }
333
334    }
335
336    /**
337     * Returns a hash code for this object instance.  The approach described by
338     * Joshua Bloch in "Effective Java" has been used here:
339     * <p>
340     * {@code http://developer.java.sun.com/developer/Books/effectivejava
341     * /Chapter3.pdf}
342     *
343     * @return A hash code.
344     */
345    @Override
346    public int hashCode() {
347        int result = 17;
348        result = 37 * result + this.quarter;
349        result = 37 * result + this.year;
350        return result;
351    }
352
353    /**
354     * Returns an integer indicating the order of this Quarter object relative
355     * to the specified object:
356     *
357     * negative == before, zero == same, positive == after.
358     *
359     * @param o1  the object to compare
360     *
361     * @return negative == before, zero == same, positive == after.
362     */
363    @Override
364    public int compareTo(Object o1) {
365
366        int result;
367
368        // CASE 1 : Comparing to another Quarter object
369        // --------------------------------------------
370        if (o1 instanceof Quarter) {
371            Quarter q = (Quarter) o1;
372            result = this.year - q.getYearValue();
373            if (result == 0) {
374                result = this.quarter - q.getQuarter();
375            }
376        }
377
378        // CASE 2 : Comparing to another TimePeriod object
379        // -----------------------------------------------
380        else if (o1 instanceof RegularTimePeriod) {
381            // more difficult case - evaluate later...
382            result = 0;
383        }
384
385        // CASE 3 : Comparing to a non-TimePeriod object
386        // ---------------------------------------------
387        else {
388            // consider time periods to be ordered after general objects
389            result = 1;
390        }
391
392        return result;
393
394    }
395
396    /**
397     * Returns a string representing the quarter (e.g. "Q1/2002").
398     *
399     * @return A string representing the quarter.
400     */
401    @Override
402    public String toString() {
403        return "Q" + this.quarter + "/" + this.year;
404    }
405
406    /**
407     * Returns the first millisecond in the Quarter, evaluated using the
408     * supplied calendar (which determines the time zone).
409     *
410     * @param calendar  the calendar ({@code null} not permitted).
411     *
412     * @return The first millisecond in the Quarter.
413     *
414     * @throws NullPointerException if {@code calendar} is
415     *     {@code null}.
416     */
417    @Override
418    public long getFirstMillisecond(Calendar calendar) {
419        int month = Quarter.FIRST_MONTH_IN_QUARTER[this.quarter];
420        calendar.set(this.year, month - 1, 1, 0, 0, 0);
421        calendar.set(Calendar.MILLISECOND, 0);
422        return calendar.getTimeInMillis();
423    }
424
425    /**
426     * Returns the last millisecond of the Quarter, evaluated using the
427     * supplied calendar (which determines the time zone).
428     *
429     * @param calendar  the calendar ({@code null} not permitted).
430     *
431     * @return The last millisecond of the Quarter.
432     *
433     * @throws NullPointerException if {@code calendar} is
434     *     {@code null}.
435     */
436    @Override
437    public long getLastMillisecond(Calendar calendar) {
438        int month = Quarter.LAST_MONTH_IN_QUARTER[this.quarter];
439        int eom = SerialDate.lastDayOfMonth(month, this.year);
440        calendar.set(this.year, month - 1, eom, 23, 59, 59);
441        calendar.set(Calendar.MILLISECOND, 999);
442        return calendar.getTimeInMillis();
443    }
444
445    /**
446     * Parses the string argument as a quarter.
447     * <P>
448     * This method should accept the following formats: "YYYY-QN" and "QN-YYYY",
449     * where the "-" can be a space, a forward-slash (/), comma or a dash (-).
450     * @param s A string representing the quarter.
451     *
452     * @return The quarter.
453     */
454    public static Quarter parseQuarter(String s) {
455
456        // find the Q and the integer following it (remove both from the
457        // string)...
458        int i = s.indexOf("Q");
459        if (i == -1) {
460            throw new TimePeriodFormatException("Missing Q.");
461        }
462
463        if (i == s.length() - 1) {
464            throw new TimePeriodFormatException("Q found at end of string.");
465        }
466
467        String qstr = s.substring(i + 1, i + 2);
468        int quarter = Integer.parseInt(qstr);
469        String remaining = s.substring(0, i) + s.substring(i + 2);
470
471        // replace any / , or - with a space
472        remaining = remaining.replace('/', ' ');
473        remaining = remaining.replace(',', ' ');
474        remaining = remaining.replace('-', ' ');
475
476        // parse the string...
477        Year year = Year.parseYear(remaining.trim());
478        Quarter result = new Quarter(quarter, year);
479        return result;
480
481    }
482
483}