Source Code Cross Referenced for DecimalValue.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.Err;
004:        import net.sf.saxon.expr.Token;
005:        import net.sf.saxon.expr.XPathContext;
006:        import net.sf.saxon.om.FastStringBuffer;
007:        import net.sf.saxon.trans.DynamicError;
008:        import net.sf.saxon.trans.XPathException;
009:        import net.sf.saxon.type.*;
010:
011:        import java.math.BigDecimal;
012:        import java.math.BigInteger;
013:        import java.util.regex.Pattern;
014:
015:        /**
016:         * A decimal value
017:         */
018:
019:        public final class DecimalValue extends NumericValue {
020:
021:            private static final int DIVIDE_PRECISION = 18;
022:
023:            private BigDecimal value;
024:
025:            public static final BigDecimal ONE = BigDecimal.valueOf(1);
026:            public static final BigInteger TEN = BigInteger.valueOf(10);
027:            public static final BigDecimal ONE_MILLION = BigDecimal
028:                    .valueOf(1000000);
029:
030:            /**
031:             * Constructor supplying a BigDecimal
032:             * @param value the value of the DecimalValue
033:             */
034:
035:            public DecimalValue(BigDecimal value) {
036:                this .value = value;
037:                loseTrailingZeros();
038:            }
039:
040:            private static final Pattern decimalPattern = Pattern
041:                    .compile("(\\-|\\+)?((\\.[0-9]+)|([0-9]+(\\.[0-9]*)?))");
042:
043:            /**
044:             * Factory method to construct a DecimalValue from a string
045:             * @param in the value of the DecimalValue
046:             * @param validate true if validation is required; false if the caller knows that the value is valid
047:             * @return the required DecimalValue if the input is valid, or an ErrorValue encapsulating the error
048:             * message if not.
049:             */
050:
051:            public static AtomicValue makeDecimalValue(CharSequence in,
052:                    boolean validate) {
053:                String trimmed = trimWhitespace(in).toString();
054:                try {
055:                    if (validate) {
056:                        if (!decimalPattern.matcher(trimmed).matches()) {
057:                            ValidationException err = new ValidationException(
058:                                    "Cannot convert string "
059:                                            + Err.wrap(trimmed, Err.VALUE)
060:                                            + " to xs:decimal");
061:                            err.setErrorCode("FORG0001");
062:                            return new ValidationErrorValue(err);
063:                        }
064:                    }
065:                    BigDecimal val = new BigDecimal(trimmed);
066:                    DecimalValue value = new DecimalValue(val);
067:                    if (trimmed.charAt(trimmed.length() - 1) == '0') {
068:                        value.loseTrailingZeros();
069:                    }
070:                    return value;
071:                } catch (NumberFormatException err) {
072:                    ValidationException e = new ValidationException(
073:                            "Cannot convert string "
074:                                    + Err.wrap(trimmed, Err.VALUE)
075:                                    + " to xs:decimal");
076:                    e.setErrorCode("FORG0001");
077:                    return new ValidationErrorValue(e);
078:                }
079:            }
080:
081:            /**
082:             * Constructor supplying a double
083:             * @param in the value of the DecimalValue
084:             */
085:
086:            public DecimalValue(double in) throws ValidationException {
087:                try {
088:                    this .value = new BigDecimal(in);
089:                    loseTrailingZeros();
090:                } catch (NumberFormatException err) {
091:                    // Must be a special value such as NaN or infinity
092:                    ValidationException e = new ValidationException(
093:                            "Cannot convert double "
094:                                    + Err.wrap(in + "", Err.VALUE)
095:                                    + " to decimal");
096:                    e.setErrorCode("FORG0001");
097:                    throw e;
098:                }
099:            }
100:
101:            /**
102:             * Constructor supplying a long integer
103:             * @param in the value of the DecimalValue
104:             */
105:
106:            public DecimalValue(long in) {
107:                this .value = BigDecimal.valueOf(in);
108:            }
109:
110:            /**
111:             * Remove insignificant trailing zeros (the Java BigDecimal class retains trailing zeros,
112:             * but the XPath 2.0 xs:decimal type does not)
113:             */
114:
115:            private void loseTrailingZeros() {
116:                int scale = value.scale();
117:                if (scale > 0) {
118:                    BigInteger i = value.unscaledValue();
119:                    while (true) {
120:                        BigInteger[] dr = i.divideAndRemainder(TEN);
121:                        if (dr[1].equals(BigInteger.ZERO)) {
122:                            i = dr[0];
123:                            scale--;
124:                            if (scale == 0) {
125:                                break;
126:                            }
127:                        } else {
128:                            break;
129:                        }
130:                    }
131:                    if (scale != value.scale()) {
132:                        value = new BigDecimal(i, scale);
133:                    }
134:                }
135:            }
136:
137:            /**
138:             * Get the value
139:             */
140:
141:            public BigDecimal getValue() {
142:                return value;
143:            }
144:
145:            /**
146:             * Get the hashCode. This must conform to the rules for other NumericValue hashcodes
147:             * @see NumericValue#hashCode
148:             */
149:
150:            public int hashCode() {
151:                BigDecimal round = value.setScale(0, BigDecimal.ROUND_DOWN);
152:                long value = round.longValue();
153:                if (value > Integer.MIN_VALUE && value < Integer.MAX_VALUE) {
154:                    return (int) value;
155:                } else {
156:                    return new Double(this .getDoubleValue()).hashCode();
157:                }
158:            }
159:
160:            public boolean effectiveBooleanValue(XPathContext context) {
161:                return value.signum() != 0;
162:            }
163:
164:            /**
165:             * Convert to target data type
166:             */
167:
168:            public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
169:                    boolean validate, XPathContext context) {
170:                switch (requiredType.getPrimitiveType()) {
171:                case Type.BOOLEAN:
172:                    // 0.0 => false, anything else => true
173:                    return BooleanValue.get(value.signum() != 0);
174:                case Type.NUMBER:
175:                case Type.DECIMAL:
176:                case Type.ANY_ATOMIC:
177:                case Type.ITEM:
178:                    return this ;
179:                case Type.INTEGER:
180:                    return BigIntegerValue.makeValue(value.toBigInteger());
181:                case Type.DOUBLE:
182:                    return new DoubleValue(value.doubleValue());
183:                case Type.FLOAT:
184:                    return new FloatValue(value.floatValue());
185:                case Type.STRING:
186:                    return new StringValue(getStringValueCS());
187:                case Type.UNTYPED_ATOMIC:
188:                    return new UntypedAtomicValue(getStringValueCS());
189:                default:
190:                    ValidationException err = new ValidationException(
191:                            "Cannot convert decimal to "
192:                                    + requiredType.getDisplayName());
193:                    err.setErrorCode("XPTY0004");
194:                    err.setIsTypeError(true);
195:                    return new ValidationErrorValue(err);
196:                }
197:            }
198:
199:            /**
200:             * Get the value as a String
201:             * @return a String representation of the value
202:             */
203:
204:            public String getStringValue() {
205:                return decimalToString(value);
206:            }
207:
208:            public static String decimalToString(BigDecimal value) {
209:                // Can't use the plain BigDecimal#toString() under JDK 1.5 because this produces values like "1E-5".
210:                // JDK 1.5 offers BigDecimal#toPlainString() which might do the job directly
211:                if (value.scale() <= 0) {
212:                    return value.toString();
213:                } else {
214:                    boolean negative = value.signum() < 0;
215:                    String s = value.abs().unscaledValue().toString();
216:                    int len = s.length();
217:                    int scale = value.scale();
218:                    FastStringBuffer sb = new FastStringBuffer(len + 1);
219:                    if (negative) {
220:                        sb.append('-');
221:                    }
222:                    if (scale >= len) {
223:                        sb.append("0.");
224:                        for (int i = len; i < scale; i++) {
225:                            sb.append('0');
226:                        }
227:                        sb.append(s);
228:                    } else {
229:                        sb.append(s.substring(0, len - scale));
230:                        sb.append('.');
231:                        sb.append(s.substring(len - scale));
232:                    }
233:                    return sb.toString();
234:                }
235:            }
236:
237:            /**
238:             * Determine the data type of the expression
239:             * @return Type.DECIMAL
240:             * @param th
241:             */
242:
243:            public ItemType getItemType(TypeHierarchy th) {
244:                return Type.DECIMAL_TYPE;
245:            }
246:
247:            /**
248:             * Negate the value
249:             */
250:
251:            public NumericValue negate() {
252:                return new DecimalValue(value.negate());
253:            }
254:
255:            /**
256:             * Implement the XPath floor() function
257:             */
258:
259:            public NumericValue floor() {
260:                return new DecimalValue(value.setScale(0,
261:                        BigDecimal.ROUND_FLOOR));
262:            }
263:
264:            /**
265:             * Implement the XPath ceiling() function
266:             */
267:
268:            public NumericValue ceiling() {
269:                return new DecimalValue(value.setScale(0,
270:                        BigDecimal.ROUND_CEILING));
271:            }
272:
273:            /**
274:             * Implement the XPath round() function
275:             */
276:
277:            public NumericValue round() {
278:                // The XPath rules say that we should round to the nearest integer, with .5 rounding towards
279:                // positive infinity. Unfortunately this is not one of the rounding modes that the Java BigDecimal
280:                // class supports.
281:
282:                // If the value is positive, we use ROUND_HALF_UP; if it is negative, we use ROUND_HALF_DOWN (here "UP"
283:                // means "away from zero")
284:
285:                switch (value.signum()) {
286:                case -1:
287:                    return new DecimalValue(value.setScale(0,
288:                            BigDecimal.ROUND_HALF_DOWN));
289:                case 0:
290:                    return this ;
291:                case +1:
292:                    return new DecimalValue(value.setScale(0,
293:                            BigDecimal.ROUND_HALF_UP));
294:                default:
295:                    // can't happen
296:                    return this ;
297:                }
298:
299:            }
300:
301:            /**
302:             * Implement the XPath round-to-half-even() function
303:             */
304:
305:            public NumericValue roundToHalfEven(int scale) {
306:                if (scale < 0) {
307:                    try {
308:                        AtomicValue val = convert(Type.INTEGER, null);
309:                        if (val instanceof  IntegerValue) {
310:                            return ((IntegerValue) val).roundToHalfEven(scale);
311:                        } else {
312:                            return ((BigIntegerValue) val)
313:                                    .roundToHalfEven(scale);
314:                        }
315:                    } catch (XPathException err) {
316:                        throw new IllegalArgumentException(
317:                                "internal error in integer-decimal conversion");
318:                    }
319:                } else {
320:                    return new DecimalValue(value.setScale(scale,
321:                            BigDecimal.ROUND_HALF_EVEN));
322:                }
323:            }
324:
325:            /**
326:             * Determine whether the value is negative, zero, or positive
327:             * @return -1 if negative, 0 if zero, +1 if positive, NaN if NaN
328:             */
329:
330:            public double signum() {
331:                return value.signum();
332:            }
333:
334:            /**
335:             * Determine whether the value is a whole number, that is, whether it compares
336:             * equal to some integer
337:             */
338:
339:            public boolean isWholeNumber() {
340:                return value.scale() == 0
341:                        || value.equals(value
342:                                .setScale(0, BigDecimal.ROUND_DOWN));
343:            }
344:
345:            /**
346:             * Evaluate a binary arithmetic operator.
347:             */
348:
349:            public NumericValue arithmetic(int operator, NumericValue other,
350:                    XPathContext context) throws XPathException {
351:                if (other instanceof  DecimalValue) {
352:                    try {
353:                        switch (operator) {
354:                        case Token.PLUS:
355:                            return new DecimalValue(value
356:                                    .add(((DecimalValue) other).value));
357:                        case Token.MINUS:
358:                            return new DecimalValue(value
359:                                    .subtract(((DecimalValue) other).value));
360:                        case Token.MULT:
361:                            return new DecimalValue(value
362:                                    .multiply(((DecimalValue) other).value));
363:                        case Token.DIV:
364:                            int scale = Math.max(DIVIDE_PRECISION, Math.max(
365:                                    value.scale(), ((DecimalValue) other).value
366:                                            .scale()));
367:                            //int scale = value.scale() + ((DecimalValue)other).value.scale() + DIVIDE_PRECISION;
368:                            BigDecimal result = value.divide(
369:                                    ((DecimalValue) other).value, scale,
370:                                    BigDecimal.ROUND_HALF_DOWN);
371:                            return new DecimalValue(result);
372:                        case Token.IDIV:
373:                            if (((DecimalValue) other).value.signum() == 0) {
374:                                DynamicError e = new DynamicError(
375:                                        "Integer division by zero");
376:                                e.setErrorCode("FOAR0001");
377:                                e.setXPathContext(context);
378:                                throw e;
379:                            }
380:                            BigInteger quot = value.divide(
381:                                    ((DecimalValue) other).value, 0,
382:                                    BigDecimal.ROUND_DOWN).toBigInteger();
383:                            return BigIntegerValue.makeValue(quot);
384:                        case Token.MOD:
385:                            //BigDecimal quotient = value.divide(((DecimalValue)other).value, ((DecimalValue)other).value.scale(), BigDecimal.ROUND_DOWN);
386:                            BigDecimal quotient = value.divide(
387:                                    ((DecimalValue) other).value, 0,
388:                                    BigDecimal.ROUND_DOWN);
389:                            BigDecimal remainder = value.subtract(quotient
390:                                    .multiply(((DecimalValue) other).value));
391:                            return new DecimalValue(remainder);
392:                        default:
393:                            throw new AssertionError("Unknown operator");
394:                        }
395:                    } catch (ArithmeticException err) {
396:                        throw new DynamicError(err);
397:                    }
398:                } else if (NumericValue.isInteger(other)) {
399:                    return arithmetic(operator, (DecimalValue) other.convert(
400:                            Type.DECIMAL, context), context);
401:                } else {
402:                    final TypeHierarchy th = context.getNamePool()
403:                            .getTypeHierarchy();
404:                    final NumericValue n = (NumericValue) convert(other
405:                            .getItemType(th).getPrimitiveType(), context);
406:                    return n.arithmetic(operator, other, context);
407:                }
408:            }
409:
410:            /**
411:             * Compare the value to another numeric value
412:             */
413:
414:            public int compareTo(Object other) {
415:                if ((NumericValue.isInteger((NumericValue) other))) {
416:                    // deliberately triggers a ClassCastException if other value is the wrong type
417:                    try {
418:                        return compareTo(((NumericValue) other).convert(
419:                                Type.DECIMAL, null));
420:                    } catch (XPathException err) {
421:                        throw new AssertionError(
422:                                "Conversion of integer to decimal should never fail");
423:                    }
424:                } else if (other instanceof  BigIntegerValue) {
425:                    return value.compareTo(((BigIntegerValue) other)
426:                            .asDecimal());
427:                } else if (other instanceof  DecimalValue) {
428:                    return value.compareTo(((DecimalValue) other).value);
429:                } else if (other instanceof  FloatValue) {
430:                    try {
431:                        return ((FloatValue) convert(Type.FLOAT, null))
432:                                .compareTo(other);
433:                    } catch (XPathException err) {
434:                        throw new AssertionError(
435:                                "Conversion of decimal to float should never fail");
436:                    }
437:                } else {
438:                    return super .compareTo(other);
439:                }
440:            }
441:
442:            /**
443:             * Compare two values for equality. This supports identity constraints in XML Schema,
444:             * which allow list-valued elements and attributes to participate in key and uniqueness constraints.
445:             * This method returns false if any error occurs during the comparison, or if any of the items
446:             * in either sequence is a node rather than an atomic value. The default implementation of
447:             * schemaEquals() is the same as equals(), but subclasses can override this.
448:             */
449:
450:            public boolean schemaEquals(Value obj) {
451:                if (obj instanceof  AtomicValue) {
452:                    obj = ((AtomicValue) obj).getPrimitiveValue();
453:                }
454:                try {
455:                    if (obj instanceof  DecimalValue) {
456:                        return value.equals(((DecimalValue) obj).value);
457:                    } else if (obj instanceof  IntegerValue) {
458:                        return schemaEquals(((IntegerValue) obj).convert(
459:                                Type.DECIMAL, null));
460:                    } else if (obj instanceof  BigIntegerValue) {
461:                        return schemaEquals(((BigIntegerValue) obj).convert(
462:                                Type.DECIMAL, null));
463:                    } else {
464:                        return false;
465:                    }
466:                } catch (XPathException e) {
467:                    return false;
468:                }
469:            }
470:
471:            /**
472:             * Convert to Java object (for passing to external functions)
473:             */
474:
475:            public Object convertToJava(Class target, XPathContext context)
476:                    throws XPathException {
477:                if (target == Object.class
478:                        || target.isAssignableFrom(BigDecimal.class)) {
479:                    return value;
480:                } else if (target.isAssignableFrom(DecimalValue.class)) {
481:                    return this ;
482:                } else if (target == boolean.class) {
483:                    BooleanValue bval = (BooleanValue) convert(Type.BOOLEAN,
484:                            context);
485:                    return Boolean.valueOf(bval.getBooleanValue());
486:                } else if (target == Boolean.class) {
487:                    BooleanValue bval = (BooleanValue) convert(Type.BOOLEAN,
488:                            context);
489:                    return Boolean.valueOf(bval.getBooleanValue());
490:                } else if (target == String.class
491:                        || target == CharSequence.class) {
492:                    return getStringValue();
493:                } else if (target == double.class || target == Double.class) {
494:                    return new Double(value.doubleValue());
495:                } else if (target == float.class || target == Float.class) {
496:                    return new Float(value.floatValue());
497:                } else if (target == long.class || target == Long.class) {
498:                    return new Long(value.longValue());
499:                } else if (target == int.class || target == Integer.class) {
500:                    return new Integer(value.intValue());
501:                } else if (target == short.class || target == Short.class) {
502:                    return new Short(value.shortValue());
503:                } else if (target == byte.class || target == Byte.class) {
504:                    return new Byte(value.byteValue());
505:                } else if (target == char.class || target == Character.class) {
506:                    return new Character((char) value.intValue());
507:                } else {
508:                    Object o = super .convertToJava(target, context);
509:                    if (o == null) {
510:                        throw new DynamicError("Conversion of decimal to "
511:                                + target.getName() + " is not supported");
512:                    }
513:                    return o;
514:                }
515:            }
516:
517:        }
518:
519:        //
520:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
521:        // you may not use this file except in compliance with the License. You may obtain a copy of the
522:        // License at http://www.mozilla.org/MPL/
523:        //
524:        // Software distributed under the License is distributed on an "AS IS" basis,
525:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
526:        // See the License for the specific language governing rights and limitations under the License.
527:        //
528:        // The Original Code is: all this file except the asStringXT() and zeros() methods (not currently used).
529:        //
530:        // The Initial Developer of the Original Code is Michael H. Kay.
531:        //
532:        // Portions created by (xt) are Copyright (C) (James Clark). All Rights Reserved.
533:        //
534:        // Contributor(s): none.
535:        //
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