Source Code Cross Referenced for DurationValue.java in  » XML » saxonb » net » sf » saxon » value » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.value 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.value;
002:
003:        import net.sf.saxon.expr.XPathContext;
004:        import net.sf.saxon.functions.Component;
005:        import net.sf.saxon.om.FastStringBuffer;
006:        import net.sf.saxon.trans.DynamicError;
007:        import net.sf.saxon.trans.XPathException;
008:        import net.sf.saxon.type.*;
009:
010:        import java.util.StringTokenizer;
011:
012:        /**
013:         * A value of type xs:duration
014:         */
015:
016:        public class DurationValue extends AtomicValue {
017:
018:            protected boolean negative = false;
019:            protected int years = 0;
020:            protected int months = 0;
021:            protected int days = 0;
022:            protected int hours = 0;
023:            protected int minutes = 0;
024:            protected int seconds = 0;
025:            protected int microseconds = 0;
026:            private boolean normalized = false;
027:
028:            /**
029:             * Private constructor for internal use
030:             */
031:
032:            protected DurationValue() {
033:            }
034:
035:            public DurationValue(boolean positive, int years, int months,
036:                    int days, int hours, int minutes, int seconds,
037:                    int microseconds) {
038:                this .negative = !positive;
039:                this .years = years;
040:                this .months = months;
041:                this .days = days;
042:                this .hours = hours;
043:                this .minutes = minutes;
044:                this .seconds = seconds;
045:                this .microseconds = microseconds;
046:                normalized = (months < 12 && hours < 24 && minutes < 60
047:                        && seconds < 60 && microseconds < 1000000);
048:            }
049:
050:            /**
051:             * Constructor: create a duration value from a supplied string, in
052:             * ISO 8601 format [+|-]PnYnMnDTnHnMnS
053:             */
054:
055:            public DurationValue(CharSequence s) throws XPathException {
056:                StringTokenizer tok = new StringTokenizer(trimWhitespace(s)
057:                        .toString(), "-+.PYMDTHS", true);
058:                try {
059:                    if (!tok.hasMoreElements())
060:                        badDuration("empty string", s);
061:                    String part = (String) tok.nextElement();
062:                    if ("+".equals(part)) {
063:                        part = (String) tok.nextElement();
064:                    } else if ("-".equals(part)) {
065:                        negative = true;
066:                        part = (String) tok.nextElement();
067:                    }
068:                    if (!"P".equals(part))
069:                        badDuration("missing 'P'", s);
070:                    int state = 0;
071:                    while (tok.hasMoreElements()) {
072:                        part = (String) tok.nextElement();
073:                        if ("T".equals(part)) {
074:                            state = 4;
075:                            part = (String) tok.nextElement();
076:                        }
077:                        int value = Integer.parseInt(part);
078:                        if (!tok.hasMoreElements())
079:                            badDuration("missing unit letter at end", s);
080:                        char delim = ((String) tok.nextElement()).charAt(0);
081:                        switch (delim) {
082:                        case 'Y':
083:                            if (state > 0)
084:                                badDuration("Y is out of sequence", s);
085:                            years = value;
086:                            state = 1;
087:                            break;
088:                        case 'M':
089:                            if (state == 4 || state == 5) {
090:                                minutes = value;
091:                                state = 6;
092:                                break;
093:                            } else if (state == 0 || state == 1) {
094:                                months = value;
095:                                state = 2;
096:                                break;
097:                            } else {
098:                                badDuration("M is out of sequence", s);
099:                            }
100:                        case 'D':
101:                            if (state > 2)
102:                                badDuration("D is out of sequence", s);
103:                            days = value;
104:                            state = 3;
105:                            break;
106:                        case 'H':
107:                            if (state != 4)
108:                                badDuration("H is out of sequence", s);
109:                            hours = value;
110:                            state = 5;
111:                            break;
112:                        case '.':
113:                            if (state < 4 || state > 6)
114:                                badDuration("misplaced decimal point", s);
115:                            seconds = value;
116:                            state = 7;
117:                            break;
118:                        case 'S':
119:                            if (state < 4 || state > 7)
120:                                badDuration("S is out of sequence", s);
121:                            if (state == 7) {
122:                                while (part.length() < 6)
123:                                    part += "0";
124:                                if (part.length() > 6)
125:                                    part = part.substring(0, 6);
126:                                microseconds = Integer.parseInt(part);
127:                            } else {
128:                                seconds = value;
129:                            }
130:                            state = 8;
131:                            break;
132:                        default:
133:                            badDuration("misplaced " + delim, s);
134:                        }
135:                    }
136:                    // Note, duration values (unlike the two xdt: subtypes) are not normalized
137:
138:                } catch (NumberFormatException err) {
139:                    badDuration("non-numeric component", s);
140:                }
141:            }
142:
143:            protected void badDuration(String msg, CharSequence s)
144:                    throws XPathException {
145:                DynamicError err = new DynamicError("Invalid duration value '"
146:                        + s + "' (" + msg + ')');
147:                err.setErrorCode("FORG0001");
148:                throw err;
149:            }
150:
151:            /**
152:             * Convert to target data type
153:             * @param requiredType an integer identifying the required atomic type
154:             * @param context
155:             * @return an AtomicValue, a value of the required type; or an ErrorValue
156:             */
157:
158:            public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
159:                    boolean validate, XPathContext context) {
160:                //System.err.println("Convert duration " + getClass() + " to " + Type.getTypeName(requiredType));
161:                switch (requiredType.getPrimitiveType()) {
162:                case Type.DURATION:
163:                case Type.ANY_ATOMIC:
164:                case Type.ITEM:
165:                    return this ;
166:                case Type.STRING:
167:                    return new StringValue(getStringValueCS());
168:                case Type.UNTYPED_ATOMIC:
169:                    return new UntypedAtomicValue(getStringValueCS());
170:                case Type.YEAR_MONTH_DURATION:
171:                    //            if (days!=0 || hours!=0 || minutes!=0 || seconds!=0 || microseconds!=0) {
172:                    //                ValidationException err = new ValidationException(
173:                    //                        "Cannot convert to yearMonthDuration because some components are non-zero");
174:                    //                //err.setXPathContext(context);
175:                    //                err.setErrorCode("FORG0001");
176:                    //                return new ValidationErrorValue(err);
177:                    //            } else {
178:                    return MonthDurationValue.fromMonths((years * 12 + months)
179:                            * (negative ? -1 : +1));
180:                    //            }
181:                case Type.DAY_TIME_DURATION:
182:                    //            if (years!=0 || months!=0) {
183:                    //                ValidationException err = new ValidationException(
184:                    //                        "Cannot convert to dayTimeDuration because some components are non-zero");
185:                    //                //err.setXPathContext(context);
186:                    //                err.setErrorCode("FORG0001");
187:                    //                return new ValidationErrorValue(err);
188:                    //            } else {
189:                    return new SecondsDurationValue((negative ? -1 : +1), days,
190:                            hours, minutes, seconds, microseconds);
191:                    //            }
192:                default:
193:                    ValidationException err = new ValidationException(
194:                            "Cannot convert duration to "
195:                                    + requiredType.getDisplayName());
196:                    err.setErrorCode("XPTY0004");
197:                    err.setIsTypeError(true);
198:                    return new ValidationErrorValue(err);
199:                }
200:            }
201:
202:            /**
203:             * Normalize the duration, so that months<12, hours<24, minutes<60, seconds<60.
204:             * At present we do this when converting to a string. It's possible that it should be done immediately
205:             * on constructing the duration (so that component extraction functions get the normalized value).
206:             * We're awaiting clarification of the spec...
207:             */
208:
209:            public DurationValue normalizeDuration() {
210:                int totalMonths = years * 12 + months;
211:                int years = totalMonths / 12;
212:                int months = totalMonths % 12;
213:                long totalMicroSeconds = ((((((days * 24L + hours) * 60L) + minutes) * 60L) + seconds) * 1000000L)
214:                        + microseconds;
215:                int microseconds = (int) (totalMicroSeconds % 1000000L);
216:                int totalSeconds = (int) (totalMicroSeconds / 1000000L);
217:                int seconds = totalSeconds % 60;
218:                int totalMinutes = totalSeconds / 60;
219:                int minutes = totalMinutes % 60;
220:                int totalHours = totalMinutes / 60;
221:                int hours = totalHours % 24;
222:                int days = totalHours / 24;
223:                return new DurationValue(!negative, years, months, days, hours,
224:                        minutes, seconds, microseconds);
225:
226:            }
227:
228:            /**
229:             * Convert the value to a string, using the serialization rules.
230:             * For atomic values this is the same as a cast; for sequence values
231:             * it gives a space-separated list. This method is refined for AtomicValues
232:             * so that it never throws an Exception.
233:             */
234:
235:            public String getStringValue() {
236:                return getStringValueCS().toString();
237:            }
238:
239:            /**
240:             * Convert to string
241:             * @return ISO 8601 representation.
242:             */
243:
244:            public CharSequence getStringValueCS() {
245:
246:                // Note, Schema does not define a canonical representation. We omit all zero components, unless
247:                // the duration is zero-length, in which case we output PT0S.
248:
249:                if (years == 0 && months == 0 && days == 0 && hours == 0
250:                        && minutes == 0 && seconds == 0 && microseconds == 0) {
251:                    return "PT0S";
252:                }
253:
254:                if (!normalized) {
255:                    return normalizeDuration().getStringValueCS();
256:                }
257:
258:                FastStringBuffer sb = new FastStringBuffer(32);
259:                if (negative) {
260:                    sb.append('-');
261:                }
262:                sb.append("P");
263:                if (years != 0) {
264:                    sb.append(years + "Y");
265:                }
266:                if (months != 0) {
267:                    sb.append(months + "M");
268:                }
269:                if (days != 0) {
270:                    sb.append(days + "D");
271:                }
272:                if (hours != 0 || minutes != 0 || seconds != 0
273:                        || microseconds != 0) {
274:                    sb.append("T");
275:                }
276:                if (hours != 0) {
277:                    sb.append(hours + "H");
278:                }
279:                if (minutes != 0) {
280:                    sb.append(minutes + "M");
281:                }
282:                if (seconds != 0 || microseconds != 0) {
283:                    if (seconds != 0 && microseconds == 0) {
284:                        sb.append(seconds + "S");
285:                    } else {
286:                        long ms = (seconds * 1000000) + microseconds;
287:                        String mss = ms + "";
288:                        if (seconds == 0) {
289:                            mss = "0000000" + mss;
290:                            mss = mss.substring(mss.length() - 7);
291:                        }
292:                        sb.append(mss.substring(0, mss.length() - 6));
293:                        sb.append('.');
294:                        int lastSigDigit = mss.length() - 1;
295:                        while (mss.charAt(lastSigDigit) == '0') {
296:                            lastSigDigit--;
297:                        }
298:                        sb.append(mss.substring(mss.length() - 6,
299:                                lastSigDigit + 1));
300:                        sb.append('S');
301:                    }
302:                }
303:
304:                return sb;
305:
306:            }
307:
308:            /**
309:             * Get length of duration in seconds, assuming an average length of month. (Note, this defines a total
310:             * ordering on durations which is different from the partial order defined in XML Schema; XPath 2.0
311:             * currently avoids defining an ordering at all. But the ordering here is consistent with the ordering
312:             * of the two duration subtypes in XPath 2.0.)
313:             */
314:
315:            public double getLengthInSeconds() {
316:                double a = years;
317:                a = a * 12 + months;
318:                a = a * (365.242199 / 12.0) + days;
319:                a = a * 24 + hours;
320:                a = a * 60 + minutes;
321:                a = a * 60 + seconds;
322:                a = a + ((double) microseconds / 1000000);
323:                return (negative ? -a : a);
324:            }
325:
326:            /**
327:             * Determine the data type of the exprssion
328:             * @return Type.DURATION,
329:             * @param th
330:             */
331:
332:            public ItemType getItemType(TypeHierarchy th) {
333:                return Type.DURATION_TYPE;
334:            }
335:
336:            /**
337:             * Convert to Java object (for passing to external functions)
338:             */
339:
340:            public Object convertToJava(Class target, XPathContext context)
341:                    throws XPathException {
342:                if (target.isAssignableFrom(DurationValue.class)) {
343:                    return this ;
344:                } else if (target == String.class
345:                        || target == CharSequence.class) {
346:                    return getStringValue();
347:                } else if (target == Object.class) {
348:                    return getStringValue();
349:                } else {
350:                    Object o = super .convertToJava(target, context);
351:                    if (o == null) {
352:                        DynamicError err = new DynamicError(
353:                                "Conversion of duration to " + target.getName()
354:                                        + " is not supported");
355:                        err.setXPathContext(context);
356:                        err.setErrorCode("SAXON:0000");
357:                    }
358:                    return o;
359:                }
360:            }
361:
362:            /**
363:             * Get a component of the value
364:             */
365:
366:            public AtomicValue getComponent(int component)
367:                    throws XPathException {
368:                // We define the method at this level, but the function signatures for the component
369:                // extraction functions ensure that the method is only ever called on the two subtypes
370:                switch (component) {
371:                case Component.YEAR:
372:                    return new IntegerValue((negative ? -years : years));
373:                case Component.MONTH:
374:                    return new IntegerValue((negative ? -months : months));
375:                case Component.DAY:
376:                    return new IntegerValue((negative ? -days : days));
377:                case Component.HOURS:
378:                    return new IntegerValue((negative ? -hours : hours));
379:                case Component.MINUTES:
380:                    return new IntegerValue((negative ? -minutes : minutes));
381:                case Component.SECONDS:
382:                    FastStringBuffer sb = new FastStringBuffer(16);
383:                    String ms = ("000000" + microseconds);
384:                    ms = ms.substring(ms.length() - 6);
385:                    sb.append((negative ? "-" : "") + seconds + '.' + ms);
386:                    return DecimalValue.makeDecimalValue(sb, false);
387:                default:
388:                    throw new IllegalArgumentException(
389:                            "Unknown component for duration: " + component);
390:                }
391:            }
392:
393:            /**
394:             * Compare the value to another duration value
395:             * @param other The other dateTime value
396:             * @return negative value if this one is the shorter duration, 0 if they are equal,
397:             * positive value if this one is the longer duration. For this purpose, a year is considered
398:             * to be equal to 365.242199 days.
399:             * @throws ClassCastException if the other value is not a DurationValue (the parameter
400:             * is declared as Object to satisfy the Comparable interface)
401:             */
402:
403:            //    public int compareTo(Object other) {
404:            //        if (!(other instanceof DurationValue)) {
405:            //            throw new ClassCastException("Duration values are not comparable to " + other.getClass());
406:            //        }
407:            //        double s1 = this.getLengthInSeconds();
408:            //        double s2 = ((DurationValue)other).getLengthInSeconds();
409:            //        if (s1==s2) return 0;
410:            //        if (s1<s2) return -1;
411:            //        return +1;
412:            //    }
413:            /**
414:             * Test if the two durations are of equal length. Note: this function is defined
415:             * in XPath 2.0, but its semantics are currently unclear.
416:             */
417:
418:            public boolean equals(Object other) {
419:                if (!(other instanceof  DurationValue)) {
420:                    throw new ClassCastException(
421:                            "Duration values are not comparable to "
422:                                    + other.getClass());
423:                }
424:                DurationValue d1 = normalizeDuration();
425:                DurationValue d2 = ((DurationValue) other).normalizeDuration();
426:                return d1.negative == d2.negative && d1.years == d2.years
427:                        && d1.months == d2.months && d1.days == d2.days
428:                        && d1.hours == d2.hours && d1.minutes == d2.minutes
429:                        && d1.seconds == d2.seconds
430:                        && d1.microseconds == d2.microseconds;
431:            }
432:
433:            public int hashCode() {
434:                return new Double(getLengthInSeconds()).hashCode();
435:            }
436:
437:            /**
438:             * Compare two values for equality. This supports the matching rules in XML Schema, which say that two
439:             * durations are equal only if all six components are equal (thus 12 months does not equal one year).
440:             */
441:
442:            public boolean schemaEquals(Value obj) {
443:                if (obj instanceof  AtomicValue) {
444:                    obj = ((AtomicValue) obj).getPrimitiveValue();
445:                }
446:                if (obj instanceof  DurationValue) {
447:                    DurationValue d = (DurationValue) obj;
448:                    return years == d.years && months == d.months
449:                            && days == d.days && hours == d.hours
450:                            && minutes == d.minutes && seconds == d.seconds
451:                            && microseconds == d.microseconds;
452:                } else {
453:                    return false;
454:                }
455:            }
456:
457:            /**
458:             * Add two durations
459:             */
460:
461:            public DurationValue add(DurationValue other, XPathContext context)
462:                    throws XPathException {
463:                throw new DynamicError(
464:                        "Only subtypes of xs:duration can be added");
465:            }
466:
467:            /**
468:             * Subtract two durations
469:             */
470:
471:            public DurationValue subtract(DurationValue other,
472:                    XPathContext context) throws XPathException {
473:                throw new DynamicError(
474:                        "Only subtypes of xs:duration can be subtracted");
475:            }
476:
477:            /**
478:             * Multiply a duration by a number
479:             */
480:
481:            public DurationValue multiply(double factor, XPathContext context)
482:                    throws XPathException {
483:                throw new DynamicError(
484:                        "Only subtypes of xs:duration can be multiplied by a number");
485:            }
486:
487:            /**
488:             * Divide a duration by a another duration
489:             */
490:
491:            public DecimalValue divide(DurationValue other, XPathContext context)
492:                    throws XPathException {
493:                throw new DynamicError(
494:                        "Only subtypes of xs:duration can be divided by another duration");
495:            }
496:
497:        }
498:
499:        //
500:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
501:        // you may not use this file except in compliance with the License. You may obtain a copy of the
502:        // License at http://www.mozilla.org/MPL/
503:        //
504:        // Software distributed under the License is distributed on an "AS IS" basis,
505:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
506:        // See the License for the specific language governing rights and limitations under the License.
507:        //
508:        // The Original Code is: all this file.
509:        //
510:        // The Initial Developer of the Original Code is Michael H. Kay
511:        //
512:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
513:        //
514:        // Contributor(s): none.
515:        //
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