Source Code Cross Referenced for Millisecond.java in  » Chart » jfreechart » org » jfree » data » time » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.data.time 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2007, by Object Refinery Limited 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:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025:         * in the United States and other countries.]
026:         *
027:         * ----------------
028:         * Millisecond.java
029:         * ----------------
030:         * (C) Copyright 2001-2007, by Object Refinery Limited.
031:         *
032:         * Original Author:  David Gilbert (for Object Refinery Limited);
033:         * Contributor(s):   -;
034:         *
035:         * $Id: Millisecond.java,v 1.5.2.4 2007/04/04 10:58:19 mungady Exp $
036:         *
037:         * Changes
038:         * -------
039:         * 11-Oct-2001 : Version 1 (DG);
040:         * 19-Dec-2001 : Added new constructors as suggested by Paul English (DG);
041:         * 26-Feb-2002 : Added new getStart() and getEnd() methods (DG);
042:         * 29-Mar-2002 : Fixed bug in getStart(), getEnd() and compareTo() methods (DG);
043:         * 10-Sep-2002 : Added getSerialIndex() method (DG);
044:         * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
045:         * 10-Jan-2003 : Changed base class and method names (DG);
046:         * 13-Mar-2003 : Moved to com.jrefinery.data.time package and implemented 
047:         *               Serializable (DG);
048:         * 21-Oct-2003 : Added hashCode() method (DG);
049:         * ------------- JFREECHART 1.0.x ---------------------------------------------
050:         * 05-Oct-2006 : Updated API docs (DG);
051:         * 06-Oct-2006 : Refactored to cache first and last millisecond values (DG);
052:         * 04-Apr-2007 : In Millisecond(Date, TimeZone), peg milliseconds to the
053:         *               specified zone (DG);
054:         *
055:         */
056:
057:        package org.jfree.data.time;
058:
059:        import java.io.Serializable;
060:        import java.util.Calendar;
061:        import java.util.Date;
062:        import java.util.TimeZone;
063:
064:        /**
065:         * Represents a millisecond.  This class is immutable, which is a requirement 
066:         * for all {@link RegularTimePeriod} subclasses.
067:         */
068:        public class Millisecond extends RegularTimePeriod implements 
069:                Serializable {
070:
071:            /** For serialization. */
072:            static final long serialVersionUID = -5316836467277638485L;
073:
074:            /** A constant for the first millisecond in a second. */
075:            public static final int FIRST_MILLISECOND_IN_SECOND = 0;
076:
077:            /** A constant for the last millisecond in a second. */
078:            public static final int LAST_MILLISECOND_IN_SECOND = 999;
079:
080:            /** The day. */
081:            private Day day;
082:
083:            /** The hour in the day. */
084:            private byte hour;
085:
086:            /** The minute. */
087:            private byte minute;
088:
089:            /** The second. */
090:            private byte second;
091:
092:            /** The millisecond. */
093:            private int millisecond;
094:
095:            /**
096:             * The pegged millisecond. 
097:             */
098:            private long firstMillisecond;
099:
100:            /**
101:             * Constructs a millisecond based on the current system time.
102:             */
103:            public Millisecond() {
104:                this (new Date());
105:            }
106:
107:            /**
108:             * Constructs a millisecond.
109:             *
110:             * @param millisecond  the millisecond (0-999).
111:             * @param second  the second.
112:             */
113:            public Millisecond(int millisecond, Second second) {
114:                this .millisecond = millisecond;
115:                this .second = (byte) second.getSecond();
116:                this .minute = (byte) second.getMinute().getMinute();
117:                this .hour = (byte) second.getMinute().getHourValue();
118:                this .day = second.getMinute().getDay();
119:                peg(Calendar.getInstance());
120:            }
121:
122:            /**
123:             * Creates a new millisecond.
124:             * 
125:             * @param millisecond  the millisecond (0-999).
126:             * @param second  the second (0-59).
127:             * @param minute  the minute (0-59).
128:             * @param hour  the hour (0-23).
129:             * @param day  the day (1-31).
130:             * @param month  the month (1-12).
131:             * @param year  the year (1900-9999).
132:             */
133:            public Millisecond(int millisecond, int second, int minute,
134:                    int hour, int day, int month, int year) {
135:
136:                this (millisecond, new Second(second, minute, hour, day, month,
137:                        year));
138:
139:            }
140:
141:            /**
142:             * Constructs a millisecond.
143:             *
144:             * @param time  the time.
145:             */
146:            public Millisecond(Date time) {
147:                this (time, RegularTimePeriod.DEFAULT_TIME_ZONE);
148:            }
149:
150:            /**
151:             * Creates a millisecond.
152:             *
153:             * @param time  the instant in time.
154:             * @param zone  the time zone.
155:             */
156:            public Millisecond(Date time, TimeZone zone) {
157:                Calendar calendar = Calendar.getInstance(zone);
158:                calendar.setTime(time);
159:                this .millisecond = calendar.get(Calendar.MILLISECOND);
160:                this .second = (byte) calendar.get(Calendar.SECOND);
161:                this .minute = (byte) calendar.get(Calendar.MINUTE);
162:                this .hour = (byte) calendar.get(Calendar.HOUR_OF_DAY);
163:                this .day = new Day(time, zone);
164:                peg(calendar);
165:            }
166:
167:            /**
168:             * Returns the second.
169:             *
170:             * @return The second.
171:             */
172:            public Second getSecond() {
173:                return new Second(this .second, this .minute, this .hour, this .day
174:                        .getDayOfMonth(), this .day.getMonth(), this .day
175:                        .getYear());
176:            }
177:
178:            /**
179:             * Returns the millisecond.
180:             *
181:             * @return The millisecond.
182:             */
183:            public long getMillisecond() {
184:                return this .millisecond;
185:            }
186:
187:            /**
188:             * Returns the first millisecond of the second.  This will be determined 
189:             * relative to the time zone specified in the constructor, or in the 
190:             * calendar instance passed in the most recent call to the 
191:             * {@link #peg(Calendar)} method.
192:             *
193:             * @return The first millisecond of the second.
194:             * 
195:             * @see #getLastMillisecond()
196:             */
197:            public long getFirstMillisecond() {
198:                return this .firstMillisecond;
199:            }
200:
201:            /**
202:             * Returns the last millisecond of the second.  This will be 
203:             * determined relative to the time zone specified in the constructor, or
204:             * in the calendar instance passed in the most recent call to the 
205:             * {@link #peg(Calendar)} method.
206:             *
207:             * @return The last millisecond of the second.
208:             * 
209:             * @see #getFirstMillisecond()
210:             */
211:            public long getLastMillisecond() {
212:                return this .firstMillisecond;
213:            }
214:
215:            /** 
216:             * Recalculates the start date/time and end date/time for this time period 
217:             * relative to the supplied calendar (which incorporates a time zone).
218:             * 
219:             * @param calendar  the calendar (<code>null</code> not permitted).
220:             * 
221:             * @since 1.0.3
222:             */
223:            public void peg(Calendar calendar) {
224:                this .firstMillisecond = getFirstMillisecond(calendar);
225:            }
226:
227:            /**
228:             * Returns the millisecond preceding this one.
229:             *
230:             * @return The millisecond preceding this one.
231:             */
232:            public RegularTimePeriod previous() {
233:
234:                RegularTimePeriod result = null;
235:
236:                if (this .millisecond != FIRST_MILLISECOND_IN_SECOND) {
237:                    result = new Millisecond(this .millisecond - 1, getSecond());
238:                } else {
239:                    Second previous = (Second) getSecond().previous();
240:                    if (previous != null) {
241:                        result = new Millisecond(LAST_MILLISECOND_IN_SECOND,
242:                                previous);
243:                    }
244:                }
245:                return result;
246:
247:            }
248:
249:            /**
250:             * Returns the millisecond following this one.
251:             *
252:             * @return The millisecond following this one.
253:             */
254:            public RegularTimePeriod next() {
255:
256:                RegularTimePeriod result = null;
257:                if (this .millisecond != LAST_MILLISECOND_IN_SECOND) {
258:                    result = new Millisecond(this .millisecond + 1, getSecond());
259:                } else {
260:                    Second next = (Second) getSecond().next();
261:                    if (next != null) {
262:                        result = new Millisecond(FIRST_MILLISECOND_IN_SECOND,
263:                                next);
264:                    }
265:                }
266:                return result;
267:
268:            }
269:
270:            /**
271:             * Returns a serial index number for the millisecond.
272:             *
273:             * @return The serial index number.
274:             */
275:            public long getSerialIndex() {
276:                long hourIndex = this .day.getSerialIndex() * 24L + this .hour;
277:                long minuteIndex = hourIndex * 60L + this .minute;
278:                long secondIndex = minuteIndex * 60L + this .second;
279:                return secondIndex * 1000L + this .millisecond;
280:            }
281:
282:            /**
283:             * Tests the equality of this object against an arbitrary Object.
284:             * <P>
285:             * This method will return true ONLY if the object is a Millisecond object
286:             * representing the same millisecond as this instance.
287:             *
288:             * @param obj  the object to compare
289:             *
290:             * @return <code>true</code> if milliseconds and seconds of this and object
291:             *      are the same.
292:             */
293:            public boolean equals(Object obj) {
294:                if (obj == this ) {
295:                    return true;
296:                }
297:                if (!(obj instanceof  Millisecond)) {
298:                    return false;
299:                }
300:                Millisecond that = (Millisecond) obj;
301:                if (this .millisecond != that.millisecond) {
302:                    return false;
303:                }
304:                if (this .second != that.second) {
305:                    return false;
306:                }
307:                if (this .minute != that.minute) {
308:                    return false;
309:                }
310:                if (this .hour != that.hour) {
311:                    return false;
312:                }
313:                if (!this .day.equals(that.day)) {
314:                    return false;
315:                }
316:                return true;
317:            }
318:
319:            /**
320:             * Returns a hash code for this object instance.  The approach described by 
321:             * Joshua Bloch in "Effective Java" has been used here:
322:             * <p>
323:             * <code>http://developer.java.sun.com/developer/Books/effectivejava
324:             * /Chapter3.pdf</code>
325:             * 
326:             * @return A hashcode.
327:             */
328:            public int hashCode() {
329:                int result = 17;
330:                result = 37 * result + this .millisecond;
331:                result = 37 * result + getSecond().hashCode();
332:                return result;
333:            }
334:
335:            /**
336:             * Returns an integer indicating the order of this Millisecond object
337:             * relative to the specified object:
338:             *
339:             * negative == before, zero == same, positive == after.
340:             *
341:             * @param obj  the object to compare
342:             *
343:             * @return negative == before, zero == same, positive == after.
344:             */
345:            public int compareTo(Object obj) {
346:
347:                int result;
348:                long difference;
349:
350:                // CASE 1 : Comparing to another Second object
351:                // -------------------------------------------
352:                if (obj instanceof  Millisecond) {
353:                    Millisecond ms = (Millisecond) obj;
354:                    difference = getFirstMillisecond()
355:                            - ms.getFirstMillisecond();
356:                    if (difference > 0) {
357:                        result = 1;
358:                    } else {
359:                        if (difference < 0) {
360:                            result = -1;
361:                        } else {
362:                            result = 0;
363:                        }
364:                    }
365:                }
366:
367:                // CASE 2 : Comparing to another TimePeriod object
368:                // -----------------------------------------------
369:                else if (obj instanceof  RegularTimePeriod) {
370:                    // more difficult case - evaluate later...
371:                    result = 0;
372:                }
373:
374:                // CASE 3 : Comparing to a non-TimePeriod object
375:                // ---------------------------------------------
376:                else {
377:                    // consider time periods to be ordered after general objects
378:                    result = 1;
379:                }
380:
381:                return result;
382:
383:            }
384:
385:            /**
386:             * Returns the first millisecond of the time period.
387:             *
388:             * @param calendar  the calendar (<code>null</code> not permitted).
389:             *
390:             * @return The first millisecond of the time period.
391:             *
392:             * @throws NullPointerException if <code>calendar</code> is 
393:             *     <code>null</code>.
394:             */
395:            public long getFirstMillisecond(Calendar calendar) {
396:                int year = this .day.getYear();
397:                int month = this .day.getMonth() - 1;
398:                int day = this .day.getDayOfMonth();
399:                calendar.clear();
400:                calendar.set(year, month, day, this .hour, this .minute,
401:                        this .second);
402:                calendar.set(Calendar.MILLISECOND, this .millisecond);
403:                //return calendar.getTimeInMillis();  // this won't work for JDK 1.3
404:                return calendar.getTime().getTime();
405:            }
406:
407:            /**
408:             * Returns the last millisecond of the time period.
409:             *
410:             * @param calendar  the calendar (<code>null</code> not permitted).
411:             *
412:             * @return The last millisecond of the time period.
413:             *
414:             * @throws NullPointerException if <code>calendar</code> is 
415:             *     <code>null</code>.
416:             */
417:            public long getLastMillisecond(Calendar calendar) {
418:                return getFirstMillisecond(calendar);
419:            }
420:
421:        }
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