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 */
017 package org.apache.commons.lang.math;
018
019 import java.math.BigDecimal;
020 import java.math.BigInteger;
021
022 import org.apache.commons.lang.StringUtils;
023
024 /**
025 * <p>Provides extra functionality for Java Number classes.</p>
026 *
027 * @author Apache Software Foundation
028 * @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
029 * @author <a href="mailto:steve.downey@netfolio.com">Steve Downey</a>
030 * @author Eric Pugh
031 * @author Phil Steitz
032 * @author Matthew Hawthorne
033 * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
034 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
035 * @since 2.0
036 * @version $Id: NumberUtils.java 1056853 2011-01-09 01:07:04Z niallp $
037 */
038 public class NumberUtils {
039
040 /** Reusable Long constant for zero. */
041 public static final Long LONG_ZERO = new Long(0L);
042 /** Reusable Long constant for one. */
043 public static final Long LONG_ONE = new Long(1L);
044 /** Reusable Long constant for minus one. */
045 public static final Long LONG_MINUS_ONE = new Long(-1L);
046 /** Reusable Integer constant for zero. */
047 public static final Integer INTEGER_ZERO = new Integer(0);
048 /** Reusable Integer constant for one. */
049 public static final Integer INTEGER_ONE = new Integer(1);
050 /** Reusable Integer constant for minus one. */
051 public static final Integer INTEGER_MINUS_ONE = new Integer(-1);
052 /** Reusable Short constant for zero. */
053 public static final Short SHORT_ZERO = new Short((short) 0);
054 /** Reusable Short constant for one. */
055 public static final Short SHORT_ONE = new Short((short) 1);
056 /** Reusable Short constant for minus one. */
057 public static final Short SHORT_MINUS_ONE = new Short((short) -1);
058 /** Reusable Byte constant for zero. */
059 public static final Byte BYTE_ZERO = new Byte((byte) 0);
060 /** Reusable Byte constant for one. */
061 public static final Byte BYTE_ONE = new Byte((byte) 1);
062 /** Reusable Byte constant for minus one. */
063 public static final Byte BYTE_MINUS_ONE = new Byte((byte) -1);
064 /** Reusable Double constant for zero. */
065 public static final Double DOUBLE_ZERO = new Double(0.0d);
066 /** Reusable Double constant for one. */
067 public static final Double DOUBLE_ONE = new Double(1.0d);
068 /** Reusable Double constant for minus one. */
069 public static final Double DOUBLE_MINUS_ONE = new Double(-1.0d);
070 /** Reusable Float constant for zero. */
071 public static final Float FLOAT_ZERO = new Float(0.0f);
072 /** Reusable Float constant for one. */
073 public static final Float FLOAT_ONE = new Float(1.0f);
074 /** Reusable Float constant for minus one. */
075 public static final Float FLOAT_MINUS_ONE = new Float(-1.0f);
076
077 /**
078 * <p><code>NumberUtils</code> instances should NOT be constructed in standard programming.
079 * Instead, the class should be used as <code>NumberUtils.toInt("6");</code>.</p>
080 *
081 * <p>This constructor is public to permit tools that require a JavaBean instance
082 * to operate.</p>
083 */
084 public NumberUtils() {
085 super();
086 }
087
088 //-----------------------------------------------------------------------
089 /**
090 * <p>Convert a <code>String</code> to an <code>int</code>, returning
091 * <code>zero</code> if the conversion fails.</p>
092 *
093 * <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
094 *
095 * <pre>
096 * NumberUtils.stringToInt(null) = 0
097 * NumberUtils.stringToInt("") = 0
098 * NumberUtils.stringToInt("1") = 1
099 * </pre>
100 *
101 * @param str the string to convert, may be null
102 * @return the int represented by the string, or <code>zero</code> if
103 * conversion fails
104 * @deprecated Use {@link #toInt(String)}
105 * This method will be removed in Commons Lang 3.0
106 */
107 public static int stringToInt(String str) {
108 return toInt(str);
109 }
110
111 /**
112 * <p>Convert a <code>String</code> to an <code>int</code>, returning
113 * <code>zero</code> if the conversion fails.</p>
114 *
115 * <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
116 *
117 * <pre>
118 * NumberUtils.toInt(null) = 0
119 * NumberUtils.toInt("") = 0
120 * NumberUtils.toInt("1") = 1
121 * </pre>
122 *
123 * @param str the string to convert, may be null
124 * @return the int represented by the string, or <code>zero</code> if
125 * conversion fails
126 * @since 2.1
127 */
128 public static int toInt(String str) {
129 return toInt(str, 0);
130 }
131
132 /**
133 * <p>Convert a <code>String</code> to an <code>int</code>, returning a
134 * default value if the conversion fails.</p>
135 *
136 * <p>If the string is <code>null</code>, the default value is returned.</p>
137 *
138 * <pre>
139 * NumberUtils.stringToInt(null, 1) = 1
140 * NumberUtils.stringToInt("", 1) = 1
141 * NumberUtils.stringToInt("1", 0) = 1
142 * </pre>
143 *
144 * @param str the string to convert, may be null
145 * @param defaultValue the default value
146 * @return the int represented by the string, or the default if conversion fails
147 * @deprecated Use {@link #toInt(String, int)}
148 * This method will be removed in Commons Lang 3.0
149 */
150 public static int stringToInt(String str, int defaultValue) {
151 return toInt(str, defaultValue);
152 }
153
154 /**
155 * <p>Convert a <code>String</code> to an <code>int</code>, returning a
156 * default value if the conversion fails.</p>
157 *
158 * <p>If the string is <code>null</code>, the default value is returned.</p>
159 *
160 * <pre>
161 * NumberUtils.toInt(null, 1) = 1
162 * NumberUtils.toInt("", 1) = 1
163 * NumberUtils.toInt("1", 0) = 1
164 * </pre>
165 *
166 * @param str the string to convert, may be null
167 * @param defaultValue the default value
168 * @return the int represented by the string, or the default if conversion fails
169 * @since 2.1
170 */
171 public static int toInt(String str, int defaultValue) {
172 if(str == null) {
173 return defaultValue;
174 }
175 try {
176 return Integer.parseInt(str);
177 } catch (NumberFormatException nfe) {
178 return defaultValue;
179 }
180 }
181
182 /**
183 * <p>Convert a <code>String</code> to a <code>long</code>, returning
184 * <code>zero</code> if the conversion fails.</p>
185 *
186 * <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
187 *
188 * <pre>
189 * NumberUtils.toLong(null) = 0L
190 * NumberUtils.toLong("") = 0L
191 * NumberUtils.toLong("1") = 1L
192 * </pre>
193 *
194 * @param str the string to convert, may be null
195 * @return the long represented by the string, or <code>0</code> if
196 * conversion fails
197 * @since 2.1
198 */
199 public static long toLong(String str) {
200 return toLong(str, 0L);
201 }
202
203 /**
204 * <p>Convert a <code>String</code> to a <code>long</code>, returning a
205 * default value if the conversion fails.</p>
206 *
207 * <p>If the string is <code>null</code>, the default value is returned.</p>
208 *
209 * <pre>
210 * NumberUtils.toLong(null, 1L) = 1L
211 * NumberUtils.toLong("", 1L) = 1L
212 * NumberUtils.toLong("1", 0L) = 1L
213 * </pre>
214 *
215 * @param str the string to convert, may be null
216 * @param defaultValue the default value
217 * @return the long represented by the string, or the default if conversion fails
218 * @since 2.1
219 */
220 public static long toLong(String str, long defaultValue) {
221 if (str == null) {
222 return defaultValue;
223 }
224 try {
225 return Long.parseLong(str);
226 } catch (NumberFormatException nfe) {
227 return defaultValue;
228 }
229 }
230
231 /**
232 * <p>Convert a <code>String</code> to a <code>float</code>, returning
233 * <code>0.0f</code> if the conversion fails.</p>
234 *
235 * <p>If the string <code>str</code> is <code>null</code>,
236 * <code>0.0f</code> is returned.</p>
237 *
238 * <pre>
239 * NumberUtils.toFloat(null) = 0.0f
240 * NumberUtils.toFloat("") = 0.0f
241 * NumberUtils.toFloat("1.5") = 1.5f
242 * </pre>
243 *
244 * @param str the string to convert, may be <code>null</code>
245 * @return the float represented by the string, or <code>0.0f</code>
246 * if conversion fails
247 * @since 2.1
248 */
249 public static float toFloat(String str) {
250 return toFloat(str, 0.0f);
251 }
252
253 /**
254 * <p>Convert a <code>String</code> to a <code>float</code>, returning a
255 * default value if the conversion fails.</p>
256 *
257 * <p>If the string <code>str</code> is <code>null</code>, the default
258 * value is returned.</p>
259 *
260 * <pre>
261 * NumberUtils.toFloat(null, 1.1f) = 1.0f
262 * NumberUtils.toFloat("", 1.1f) = 1.1f
263 * NumberUtils.toFloat("1.5", 0.0f) = 1.5f
264 * </pre>
265 *
266 * @param str the string to convert, may be <code>null</code>
267 * @param defaultValue the default value
268 * @return the float represented by the string, or defaultValue
269 * if conversion fails
270 * @since 2.1
271 */
272 public static float toFloat(String str, float defaultValue) {
273 if (str == null) {
274 return defaultValue;
275 }
276 try {
277 return Float.parseFloat(str);
278 } catch (NumberFormatException nfe) {
279 return defaultValue;
280 }
281 }
282
283 /**
284 * <p>Convert a <code>String</code> to a <code>double</code>, returning
285 * <code>0.0d</code> if the conversion fails.</p>
286 *
287 * <p>If the string <code>str</code> is <code>null</code>,
288 * <code>0.0d</code> is returned.</p>
289 *
290 * <pre>
291 * NumberUtils.toDouble(null) = 0.0d
292 * NumberUtils.toDouble("") = 0.0d
293 * NumberUtils.toDouble("1.5") = 1.5d
294 * </pre>
295 *
296 * @param str the string to convert, may be <code>null</code>
297 * @return the double represented by the string, or <code>0.0d</code>
298 * if conversion fails
299 * @since 2.1
300 */
301 public static double toDouble(String str) {
302 return toDouble(str, 0.0d);
303 }
304
305 /**
306 * <p>Convert a <code>String</code> to a <code>double</code>, returning a
307 * default value if the conversion fails.</p>
308 *
309 * <p>If the string <code>str</code> is <code>null</code>, the default
310 * value is returned.</p>
311 *
312 * <pre>
313 * NumberUtils.toDouble(null, 1.1d) = 1.1d
314 * NumberUtils.toDouble("", 1.1d) = 1.1d
315 * NumberUtils.toDouble("1.5", 0.0d) = 1.5d
316 * </pre>
317 *
318 * @param str the string to convert, may be <code>null</code>
319 * @param defaultValue the default value
320 * @return the double represented by the string, or defaultValue
321 * if conversion fails
322 * @since 2.1
323 */
324 public static double toDouble(String str, double defaultValue) {
325 if (str == null) {
326 return defaultValue;
327 }
328 try {
329 return Double.parseDouble(str);
330 } catch (NumberFormatException nfe) {
331 return defaultValue;
332 }
333 }
334
335 //-----------------------------------------------------------------------
336 /**
337 * <p>Convert a <code>String</code> to a <code>byte</code>, returning
338 * <code>zero</code> if the conversion fails.</p>
339 *
340 * <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
341 *
342 * <pre>
343 * NumberUtils.toByte(null) = 0
344 * NumberUtils.toByte("") = 0
345 * NumberUtils.toByte("1") = 1
346 * </pre>
347 *
348 * @param str the string to convert, may be null
349 * @return the byte represented by the string, or <code>zero</code> if
350 * conversion fails
351 * @since 2.5
352 */
353 public static byte toByte(String str) {
354 return toByte(str, (byte) 0);
355 }
356
357 /**
358 * <p>Convert a <code>String</code> to a <code>byte</code>, returning a
359 * default value if the conversion fails.</p>
360 *
361 * <p>If the string is <code>null</code>, the default value is returned.</p>
362 *
363 * <pre>
364 * NumberUtils.toByte(null, 1) = 1
365 * NumberUtils.toByte("", 1) = 1
366 * NumberUtils.toByte("1", 0) = 1
367 * </pre>
368 *
369 * @param str the string to convert, may be null
370 * @param defaultValue the default value
371 * @return the byte represented by the string, or the default if conversion fails
372 * @since 2.5
373 */
374 public static byte toByte(String str, byte defaultValue) {
375 if(str == null) {
376 return defaultValue;
377 }
378 try {
379 return Byte.parseByte(str);
380 } catch (NumberFormatException nfe) {
381 return defaultValue;
382 }
383 }
384
385 /**
386 * <p>Convert a <code>String</code> to a <code>short</code>, returning
387 * <code>zero</code> if the conversion fails.</p>
388 *
389 * <p>If the string is <code>null</code>, <code>zero</code> is returned.</p>
390 *
391 * <pre>
392 * NumberUtils.toShort(null) = 0
393 * NumberUtils.toShort("") = 0
394 * NumberUtils.toShort("1") = 1
395 * </pre>
396 *
397 * @param str the string to convert, may be null
398 * @return the short represented by the string, or <code>zero</code> if
399 * conversion fails
400 * @since 2.5
401 */
402 public static short toShort(String str) {
403 return toShort(str, (short) 0);
404 }
405
406 /**
407 * <p>Convert a <code>String</code> to an <code>short</code>, returning a
408 * default value if the conversion fails.</p>
409 *
410 * <p>If the string is <code>null</code>, the default value is returned.</p>
411 *
412 * <pre>
413 * NumberUtils.toShort(null, 1) = 1
414 * NumberUtils.toShort("", 1) = 1
415 * NumberUtils.toShort("1", 0) = 1
416 * </pre>
417 *
418 * @param str the string to convert, may be null
419 * @param defaultValue the default value
420 * @return the short represented by the string, or the default if conversion fails
421 * @since 2.5
422 */
423 public static short toShort(String str, short defaultValue) {
424 if(str == null) {
425 return defaultValue;
426 }
427 try {
428 return Short.parseShort(str);
429 } catch (NumberFormatException nfe) {
430 return defaultValue;
431 }
432 }
433
434 //-----------------------------------------------------------------------
435 // must handle Long, Float, Integer, Float, Short,
436 // BigDecimal, BigInteger and Byte
437 // useful methods:
438 // Byte.decode(String)
439 // Byte.valueOf(String,int radix)
440 // Byte.valueOf(String)
441 // Double.valueOf(String)
442 // Float.valueOf(String)
443 // new Float(String)
444 // Integer.valueOf(String,int radix)
445 // Integer.valueOf(String)
446 // Integer.decode(String)
447 // Integer.getInteger(String)
448 // Integer.getInteger(String,int val)
449 // Integer.getInteger(String,Integer val)
450 // new Integer(String)
451 // new Double(String)
452 // new Byte(String)
453 // new Long(String)
454 // Long.getLong(String)
455 // Long.getLong(String,int)
456 // Long.getLong(String,Integer)
457 // Long.valueOf(String,int)
458 // Long.valueOf(String)
459 // new Short(String)
460 // Short.decode(String)
461 // Short.valueOf(String,int)
462 // Short.valueOf(String)
463 // new BigDecimal(String)
464 // new BigInteger(String)
465 // new BigInteger(String,int radix)
466 // Possible inputs:
467 // 45 45.5 45E7 4.5E7 Hex Oct Binary xxxF xxxD xxxf xxxd
468 // plus minus everything. Prolly more. A lot are not separable.
469
470 /**
471 * <p>Turns a string value into a java.lang.Number.</p>
472 *
473 * <p>First, the value is examined for a type qualifier on the end
474 * (<code>'f','F','d','D','l','L'</code>). If it is found, it starts
475 * trying to create successively larger types from the type specified
476 * until one is found that can represent the value.</p>
477 *
478 * <p>If a type specifier is not found, it will check for a decimal point
479 * and then try successively larger types from <code>Integer</code> to
480 * <code>BigInteger</code> and from <code>Float</code> to
481 * <code>BigDecimal</code>.</p>
482 *
483 * <p>If the string starts with <code>0x</code> or <code>-0x</code>, it
484 * will be interpreted as a hexadecimal integer. Values with leading
485 * <code>0</code>'s will not be interpreted as octal.</p>
486 *
487 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
488 *
489 * <p>This method does not trim the input string, i.e., strings with leading
490 * or trailing spaces will generate NumberFormatExceptions.</p>
491 *
492 * @param str String containing a number, may be null
493 * @return Number created from the string
494 * @throws NumberFormatException if the value cannot be converted
495 */
496 public static Number createNumber(String str) throws NumberFormatException {
497 if (str == null) {
498 return null;
499 }
500 if (StringUtils.isBlank(str)) {
501 throw new NumberFormatException("A blank string is not a valid number");
502 }
503 if (str.startsWith("--")) {
504 // this is protection for poorness in java.lang.BigDecimal.
505 // it accepts this as a legal value, but it does not appear
506 // to be in specification of class. OS X Java parses it to
507 // a wrong value.
508 return null;
509 }
510 if (str.startsWith("0x") || str.startsWith("-0x")) {
511 return createInteger(str);
512 }
513 char lastChar = str.charAt(str.length() - 1);
514 String mant;
515 String dec;
516 String exp;
517 int decPos = str.indexOf('.');
518 int expPos = str.indexOf('e') + str.indexOf('E') + 1;
519
520 if (decPos > -1) {
521
522 if (expPos > -1) {
523 if (expPos < decPos || expPos > str.length()) {
524 throw new NumberFormatException(str + " is not a valid number.");
525 }
526 dec = str.substring(decPos + 1, expPos);
527 } else {
528 dec = str.substring(decPos + 1);
529 }
530 mant = str.substring(0, decPos);
531 } else {
532 if (expPos > -1) {
533 if (expPos > str.length()) {
534 throw new NumberFormatException(str + " is not a valid number.");
535 }
536 mant = str.substring(0, expPos);
537 } else {
538 mant = str;
539 }
540 dec = null;
541 }
542 if (!Character.isDigit(lastChar) && lastChar != '.') {
543 if (expPos > -1 && expPos < str.length() - 1) {
544 exp = str.substring(expPos + 1, str.length() - 1);
545 } else {
546 exp = null;
547 }
548 //Requesting a specific type..
549 String numeric = str.substring(0, str.length() - 1);
550 boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
551 switch (lastChar) {
552 case 'l' :
553 case 'L' :
554 if (dec == null
555 && exp == null
556 && (numeric.charAt(0) == '-' && isDigits(numeric.substring(1)) || isDigits(numeric))) {
557 try {
558 return createLong(numeric);
559 } catch (NumberFormatException nfe) {
560 //Too big for a long
561 }
562 return createBigInteger(numeric);
563
564 }
565 throw new NumberFormatException(str + " is not a valid number.");
566 case 'f' :
567 case 'F' :
568 try {
569 Float f = NumberUtils.createFloat(numeric);
570 if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) {
571 //If it's too big for a float or the float value = 0 and the string
572 //has non-zeros in it, then float does not have the precision we want
573 return f;
574 }
575
576 } catch (NumberFormatException nfe) {
577 // ignore the bad number
578 }
579 //$FALL-THROUGH$
580 case 'd' :
581 case 'D' :
582 try {
583 Double d = NumberUtils.createDouble(numeric);
584 if (!(d.isInfinite() || (d.floatValue() == 0.0D && !allZeros))) {
585 return d;
586 }
587 } catch (NumberFormatException nfe) {
588 // ignore the bad number
589 }
590 try {
591 return createBigDecimal(numeric);
592 } catch (NumberFormatException e) {
593 // ignore the bad number
594 }
595 //$FALL-THROUGH$
596 default :
597 throw new NumberFormatException(str + " is not a valid number.");
598
599 }
600 } else {
601 //User doesn't have a preference on the return type, so let's start
602 //small and go from there...
603 if (expPos > -1 && expPos < str.length() - 1) {
604 exp = str.substring(expPos + 1, str.length());
605 } else {
606 exp = null;
607 }
608 if (dec == null && exp == null) {
609 //Must be an int,long,bigint
610 try {
611 return createInteger(str);
612 } catch (NumberFormatException nfe) {
613 // ignore the bad number
614 }
615 try {
616 return createLong(str);
617 } catch (NumberFormatException nfe) {
618 // ignore the bad number
619 }
620 return createBigInteger(str);
621
622 } else {
623 //Must be a float,double,BigDec
624 boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
625 try {
626 Float f = createFloat(str);
627 if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) {
628 return f;
629 }
630 } catch (NumberFormatException nfe) {
631 // ignore the bad number
632 }
633 try {
634 Double d = createDouble(str);
635 if (!(d.isInfinite() || (d.doubleValue() == 0.0D && !allZeros))) {
636 return d;
637 }
638 } catch (NumberFormatException nfe) {
639 // ignore the bad number
640 }
641
642 return createBigDecimal(str);
643
644 }
645 }
646 }
647
648 /**
649 * <p>Utility method for {@link #createNumber(java.lang.String)}.</p>
650 *
651 * <p>Returns <code>true</code> if s is <code>null</code>.</p>
652 *
653 * @param str the String to check
654 * @return if it is all zeros or <code>null</code>
655 */
656 private static boolean isAllZeros(String str) {
657 if (str == null) {
658 return true;
659 }
660 for (int i = str.length() - 1; i >= 0; i--) {
661 if (str.charAt(i) != '0') {
662 return false;
663 }
664 }
665 return str.length() > 0;
666 }
667
668 //-----------------------------------------------------------------------
669 /**
670 * <p>Convert a <code>String</code> to a <code>Float</code>.</p>
671 *
672 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
673 *
674 * @param str a <code>String</code> to convert, may be null
675 * @return converted <code>Float</code>
676 * @throws NumberFormatException if the value cannot be converted
677 */
678 public static Float createFloat(String str) {
679 if (str == null) {
680 return null;
681 }
682 return Float.valueOf(str);
683 }
684
685 /**
686 * <p>Convert a <code>String</code> to a <code>Double</code>.</p>
687 *
688 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
689 *
690 * @param str a <code>String</code> to convert, may be null
691 * @return converted <code>Double</code>
692 * @throws NumberFormatException if the value cannot be converted
693 */
694 public static Double createDouble(String str) {
695 if (str == null) {
696 return null;
697 }
698 return Double.valueOf(str);
699 }
700
701 /**
702 * <p>Convert a <code>String</code> to a <code>Integer</code>, handling
703 * hex and octal notations.</p>
704 *
705 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
706 *
707 * @param str a <code>String</code> to convert, may be null
708 * @return converted <code>Integer</code>
709 * @throws NumberFormatException if the value cannot be converted
710 */
711 public static Integer createInteger(String str) {
712 if (str == null) {
713 return null;
714 }
715 // decode() handles 0xAABD and 0777 (hex and octal) as well.
716 return Integer.decode(str);
717 }
718
719 /**
720 * <p>Convert a <code>String</code> to a <code>Long</code>.</p>
721 *
722 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
723 *
724 * @param str a <code>String</code> to convert, may be null
725 * @return converted <code>Long</code>
726 * @throws NumberFormatException if the value cannot be converted
727 */
728 public static Long createLong(String str) {
729 if (str == null) {
730 return null;
731 }
732 return Long.valueOf(str);
733 }
734
735 /**
736 * <p>Convert a <code>String</code> to a <code>BigInteger</code>.</p>
737 *
738 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
739 *
740 * @param str a <code>String</code> to convert, may be null
741 * @return converted <code>BigInteger</code>
742 * @throws NumberFormatException if the value cannot be converted
743 */
744 public static BigInteger createBigInteger(String str) {
745 if (str == null) {
746 return null;
747 }
748 return new BigInteger(str);
749 }
750
751 /**
752 * <p>Convert a <code>String</code> to a <code>BigDecimal</code>.</p>
753 *
754 * <p>Returns <code>null</code> if the string is <code>null</code>.</p>
755 *
756 * @param str a <code>String</code> to convert, may be null
757 * @return converted <code>BigDecimal</code>
758 * @throws NumberFormatException if the value cannot be converted
759 */
760 public static BigDecimal createBigDecimal(String str) {
761 if (str == null) {
762 return null;
763 }
764 // handle JDK1.3.1 bug where "" throws IndexOutOfBoundsException
765 if (StringUtils.isBlank(str)) {
766 throw new NumberFormatException("A blank string is not a valid number");
767 }
768 return new BigDecimal(str);
769 }
770
771 // Min in array
772 //--------------------------------------------------------------------
773 /**
774 * <p>Returns the minimum value in an array.</p>
775 *
776 * @param array an array, must not be null or empty
777 * @return the minimum value in the array
778 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
779 * @throws IllegalArgumentException if <code>array</code> is empty
780 */
781 public static long min(long[] array) {
782 // Validates input
783 if (array == null) {
784 throw new IllegalArgumentException("The Array must not be null");
785 } else if (array.length == 0) {
786 throw new IllegalArgumentException("Array cannot be empty.");
787 }
788
789 // Finds and returns min
790 long min = array[0];
791 for (int i = 1; i < array.length; i++) {
792 if (array[i] < min) {
793 min = array[i];
794 }
795 }
796
797 return min;
798 }
799
800 /**
801 * <p>Returns the minimum value in an array.</p>
802 *
803 * @param array an array, must not be null or empty
804 * @return the minimum value in the array
805 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
806 * @throws IllegalArgumentException if <code>array</code> is empty
807 */
808 public static int min(int[] array) {
809 // Validates input
810 if (array == null) {
811 throw new IllegalArgumentException("The Array must not be null");
812 } else if (array.length == 0) {
813 throw new IllegalArgumentException("Array cannot be empty.");
814 }
815
816 // Finds and returns min
817 int min = array[0];
818 for (int j = 1; j < array.length; j++) {
819 if (array[j] < min) {
820 min = array[j];
821 }
822 }
823
824 return min;
825 }
826
827 /**
828 * <p>Returns the minimum value in an array.</p>
829 *
830 * @param array an array, must not be null or empty
831 * @return the minimum value in the array
832 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
833 * @throws IllegalArgumentException if <code>array</code> is empty
834 */
835 public static short min(short[] array) {
836 // Validates input
837 if (array == null) {
838 throw new IllegalArgumentException("The Array must not be null");
839 } else if (array.length == 0) {
840 throw new IllegalArgumentException("Array cannot be empty.");
841 }
842
843 // Finds and returns min
844 short min = array[0];
845 for (int i = 1; i < array.length; i++) {
846 if (array[i] < min) {
847 min = array[i];
848 }
849 }
850
851 return min;
852 }
853
854 /**
855 * <p>Returns the minimum value in an array.</p>
856 *
857 * @param array an array, must not be null or empty
858 * @return the minimum value in the array
859 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
860 * @throws IllegalArgumentException if <code>array</code> is empty
861 */
862 public static byte min(byte[] array) {
863 // Validates input
864 if (array == null) {
865 throw new IllegalArgumentException("The Array must not be null");
866 } else if (array.length == 0) {
867 throw new IllegalArgumentException("Array cannot be empty.");
868 }
869
870 // Finds and returns min
871 byte min = array[0];
872 for (int i = 1; i < array.length; i++) {
873 if (array[i] < min) {
874 min = array[i];
875 }
876 }
877
878 return min;
879 }
880
881 /**
882 * <p>Returns the minimum value in an array.</p>
883 *
884 * @param array an array, must not be null or empty
885 * @return the minimum value in the array
886 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
887 * @throws IllegalArgumentException if <code>array</code> is empty
888 * @see IEEE754rUtils#min(double[]) IEEE754rUtils for a version of this method that handles NaN differently
889 */
890 public static double min(double[] array) {
891 // Validates input
892 if (array == null) {
893 throw new IllegalArgumentException("The Array must not be null");
894 } else if (array.length == 0) {
895 throw new IllegalArgumentException("Array cannot be empty.");
896 }
897
898 // Finds and returns min
899 double min = array[0];
900 for (int i = 1; i < array.length; i++) {
901 if (Double.isNaN(array[i])) {
902 return Double.NaN;
903 }
904 if (array[i] < min) {
905 min = array[i];
906 }
907 }
908
909 return min;
910 }
911
912 /**
913 * <p>Returns the minimum value in an array.</p>
914 *
915 * @param array an array, must not be null or empty
916 * @return the minimum value in the array
917 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
918 * @throws IllegalArgumentException if <code>array</code> is empty
919 * @see IEEE754rUtils#min(float[]) IEEE754rUtils for a version of this method that handles NaN differently
920 */
921 public static float min(float[] array) {
922 // Validates input
923 if (array == null) {
924 throw new IllegalArgumentException("The Array must not be null");
925 } else if (array.length == 0) {
926 throw new IllegalArgumentException("Array cannot be empty.");
927 }
928
929 // Finds and returns min
930 float min = array[0];
931 for (int i = 1; i < array.length; i++) {
932 if (Float.isNaN(array[i])) {
933 return Float.NaN;
934 }
935 if (array[i] < min) {
936 min = array[i];
937 }
938 }
939
940 return min;
941 }
942
943 // Max in array
944 //--------------------------------------------------------------------
945 /**
946 * <p>Returns the maximum value in an array.</p>
947 *
948 * @param array an array, must not be null or empty
949 * @return the minimum value in the array
950 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
951 * @throws IllegalArgumentException if <code>array</code> is empty
952 */
953 public static long max(long[] array) {
954 // Validates input
955 if (array == null) {
956 throw new IllegalArgumentException("The Array must not be null");
957 } else if (array.length == 0) {
958 throw new IllegalArgumentException("Array cannot be empty.");
959 }
960
961 // Finds and returns max
962 long max = array[0];
963 for (int j = 1; j < array.length; j++) {
964 if (array[j] > max) {
965 max = array[j];
966 }
967 }
968
969 return max;
970 }
971
972 /**
973 * <p>Returns the maximum value in an array.</p>
974 *
975 * @param array an array, must not be null or empty
976 * @return the minimum value in the array
977 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
978 * @throws IllegalArgumentException if <code>array</code> is empty
979 */
980 public static int max(int[] array) {
981 // Validates input
982 if (array == null) {
983 throw new IllegalArgumentException("The Array must not be null");
984 } else if (array.length == 0) {
985 throw new IllegalArgumentException("Array cannot be empty.");
986 }
987
988 // Finds and returns max
989 int max = array[0];
990 for (int j = 1; j < array.length; j++) {
991 if (array[j] > max) {
992 max = array[j];
993 }
994 }
995
996 return max;
997 }
998
999 /**
1000 * <p>Returns the maximum value in an array.</p>
1001 *
1002 * @param array an array, must not be null or empty
1003 * @return the minimum value in the array
1004 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
1005 * @throws IllegalArgumentException if <code>array</code> is empty
1006 */
1007 public static short max(short[] array) {
1008 // Validates input
1009 if (array == null) {
1010 throw new IllegalArgumentException("The Array must not be null");
1011 } else if (array.length == 0) {
1012 throw new IllegalArgumentException("Array cannot be empty.");
1013 }
1014
1015 // Finds and returns max
1016 short max = array[0];
1017 for (int i = 1; i < array.length; i++) {
1018 if (array[i] > max) {
1019 max = array[i];
1020 }
1021 }
1022
1023 return max;
1024 }
1025
1026 /**
1027 * <p>Returns the maximum value in an array.</p>
1028 *
1029 * @param array an array, must not be null or empty
1030 * @return the minimum value in the array
1031 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
1032 * @throws IllegalArgumentException if <code>array</code> is empty
1033 */
1034 public static byte max(byte[] array) {
1035 // Validates input
1036 if (array == null) {
1037 throw new IllegalArgumentException("The Array must not be null");
1038 } else if (array.length == 0) {
1039 throw new IllegalArgumentException("Array cannot be empty.");
1040 }
1041
1042 // Finds and returns max
1043 byte max = array[0];
1044 for (int i = 1; i < array.length; i++) {
1045 if (array[i] > max) {
1046 max = array[i];
1047 }
1048 }
1049
1050 return max;
1051 }
1052
1053 /**
1054 * <p>Returns the maximum value in an array.</p>
1055 *
1056 * @param array an array, must not be null or empty
1057 * @return the minimum value in the array
1058 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
1059 * @throws IllegalArgumentException if <code>array</code> is empty
1060 * @see IEEE754rUtils#max(double[]) IEEE754rUtils for a version of this method that handles NaN differently
1061 */
1062 public static double max(double[] array) {
1063 // Validates input
1064 if (array== null) {
1065 throw new IllegalArgumentException("The Array must not be null");
1066 } else if (array.length == 0) {
1067 throw new IllegalArgumentException("Array cannot be empty.");
1068 }
1069
1070 // Finds and returns max
1071 double max = array[0];
1072 for (int j = 1; j < array.length; j++) {
1073 if (Double.isNaN(array[j])) {
1074 return Double.NaN;
1075 }
1076 if (array[j] > max) {
1077 max = array[j];
1078 }
1079 }
1080
1081 return max;
1082 }
1083
1084 /**
1085 * <p>Returns the maximum value in an array.</p>
1086 *
1087 * @param array an array, must not be null or empty
1088 * @return the minimum value in the array
1089 * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
1090 * @throws IllegalArgumentException if <code>array</code> is empty
1091 * @see IEEE754rUtils#max(float[]) IEEE754rUtils for a version of this method that handles NaN differently
1092 */
1093 public static float max(float[] array) {
1094 // Validates input
1095 if (array == null) {
1096 throw new IllegalArgumentException("The Array must not be null");
1097 } else if (array.length == 0) {
1098 throw new IllegalArgumentException("Array cannot be empty.");
1099 }
1100
1101 // Finds and returns max
1102 float max = array[0];
1103 for (int j = 1; j < array.length; j++) {
1104 if (Float.isNaN(array[j])) {
1105 return Float.NaN;
1106 }
1107 if (array[j] > max) {
1108 max = array[j];
1109 }
1110 }
1111
1112 return max;
1113 }
1114
1115 // 3 param min
1116 //-----------------------------------------------------------------------
1117 /**
1118 * <p>Gets the minimum of three <code>long</code> values.</p>
1119 *
1120 * @param a value 1
1121 * @param b value 2
1122 * @param c value 3
1123 * @return the smallest of the values
1124 */
1125 public static long min(long a, long b, long c) {
1126 if (b < a) {
1127 a = b;
1128 }
1129 if (c < a) {
1130 a = c;
1131 }
1132 return a;
1133 }
1134
1135 /**
1136 * <p>Gets the minimum of three <code>int</code> values.</p>
1137 *
1138 * @param a value 1
1139 * @param b value 2
1140 * @param c value 3
1141 * @return the smallest of the values
1142 */
1143 public static int min(int a, int b, int c) {
1144 if (b < a) {
1145 a = b;
1146 }
1147 if (c < a) {
1148 a = c;
1149 }
1150 return a;
1151 }
1152
1153 /**
1154 * <p>Gets the minimum of three <code>short</code> values.</p>
1155 *
1156 * @param a value 1
1157 * @param b value 2
1158 * @param c value 3
1159 * @return the smallest of the values
1160 */
1161 public static short min(short a, short b, short c) {
1162 if (b < a) {
1163 a = b;
1164 }
1165 if (c < a) {
1166 a = c;
1167 }
1168 return a;
1169 }
1170
1171 /**
1172 * <p>Gets the minimum of three <code>byte</code> values.</p>
1173 *
1174 * @param a value 1
1175 * @param b value 2
1176 * @param c value 3
1177 * @return the smallest of the values
1178 */
1179 public static byte min(byte a, byte b, byte c) {
1180 if (b < a) {
1181 a = b;
1182 }
1183 if (c < a) {
1184 a = c;
1185 }
1186 return a;
1187 }
1188
1189 /**
1190 * <p>Gets the minimum of three <code>double</code> values.</p>
1191 *
1192 * <p>If any value is <code>NaN</code>, <code>NaN</code> is
1193 * returned. Infinity is handled.</p>
1194 *
1195 * @param a value 1
1196 * @param b value 2
1197 * @param c value 3
1198 * @return the smallest of the values
1199 * @see IEEE754rUtils#min(double, double, double) for a version of this method that handles NaN differently
1200 */
1201 public static double min(double a, double b, double c) {
1202 return Math.min(Math.min(a, b), c);
1203 }
1204
1205 /**
1206 * <p>Gets the minimum of three <code>float</code> values.</p>
1207 *
1208 * <p>If any value is <code>NaN</code>, <code>NaN</code> is
1209 * returned. Infinity is handled.</p>
1210 *
1211 * @param a value 1
1212 * @param b value 2
1213 * @param c value 3
1214 * @return the smallest of the values
1215 * @see IEEE754rUtils#min(float, float, float) for a version of this method that handles NaN differently
1216 */
1217 public static float min(float a, float b, float c) {
1218 return Math.min(Math.min(a, b), c);
1219 }
1220
1221 // 3 param max
1222 //-----------------------------------------------------------------------
1223 /**
1224 * <p>Gets the maximum of three <code>long</code> values.</p>
1225 *
1226 * @param a value 1
1227 * @param b value 2
1228 * @param c value 3
1229 * @return the largest of the values
1230 */
1231 public static long max(long a, long b, long c) {
1232 if (b > a) {
1233 a = b;
1234 }
1235 if (c > a) {
1236 a = c;
1237 }
1238 return a;
1239 }
1240
1241 /**
1242 * <p>Gets the maximum of three <code>int</code> values.</p>
1243 *
1244 * @param a value 1
1245 * @param b value 2
1246 * @param c value 3
1247 * @return the largest of the values
1248 */
1249 public static int max(int a, int b, int c) {
1250 if (b > a) {
1251 a = b;
1252 }
1253 if (c > a) {
1254 a = c;
1255 }
1256 return a;
1257 }
1258
1259 /**
1260 * <p>Gets the maximum of three <code>short</code> values.</p>
1261 *
1262 * @param a value 1
1263 * @param b value 2
1264 * @param c value 3
1265 * @return the largest of the values
1266 */
1267 public static short max(short a, short b, short c) {
1268 if (b > a) {
1269 a = b;
1270 }
1271 if (c > a) {
1272 a = c;
1273 }
1274 return a;
1275 }
1276
1277 /**
1278 * <p>Gets the maximum of three <code>byte</code> values.</p>
1279 *
1280 * @param a value 1
1281 * @param b value 2
1282 * @param c value 3
1283 * @return the largest of the values
1284 */
1285 public static byte max(byte a, byte b, byte c) {
1286 if (b > a) {
1287 a = b;
1288 }
1289 if (c > a) {
1290 a = c;
1291 }
1292 return a;
1293 }
1294
1295 /**
1296 * <p>Gets the maximum of three <code>double</code> values.</p>
1297 *
1298 * <p>If any value is <code>NaN</code>, <code>NaN</code> is
1299 * returned. Infinity is handled.</p>
1300 *
1301 * @param a value 1
1302 * @param b value 2
1303 * @param c value 3
1304 * @return the largest of the values
1305 * @see IEEE754rUtils#max(double, double, double) for a version of this method that handles NaN differently
1306 */
1307 public static double max(double a, double b, double c) {
1308 return Math.max(Math.max(a, b), c);
1309 }
1310
1311 /**
1312 * <p>Gets the maximum of three <code>float</code> values.</p>
1313 *
1314 * <p>If any value is <code>NaN</code>, <code>NaN</code> is
1315 * returned. Infinity is handled.</p>
1316 *
1317 * @param a value 1
1318 * @param b value 2
1319 * @param c value 3
1320 * @return the largest of the values
1321 * @see IEEE754rUtils#max(float, float, float) for a version of this method that handles NaN differently
1322 */
1323 public static float max(float a, float b, float c) {
1324 return Math.max(Math.max(a, b), c);
1325 }
1326
1327 //-----------------------------------------------------------------------
1328 /**
1329 * <p>Compares two <code>doubles</code> for order.</p>
1330 *
1331 * <p>This method is more comprehensive than the standard Java greater
1332 * than, less than and equals operators.</p>
1333 * <ul>
1334 * <li>It returns <code>-1</code> if the first value is less than the second.</li>
1335 * <li>It returns <code>+1</code> if the first value is greater than the second.</li>
1336 * <li>It returns <code>0</code> if the values are equal.</li>
1337 * </ul>
1338 *
1339 * <p>
1340 * The ordering is as follows, largest to smallest:
1341 * <ul>
1342 * <li>NaN
1343 * <li>Positive infinity
1344 * <li>Maximum double
1345 * <li>Normal positive numbers
1346 * <li>+0.0
1347 * <li>-0.0
1348 * <li>Normal negative numbers
1349 * <li>Minimum double (<code>-Double.MAX_VALUE</code>)
1350 * <li>Negative infinity
1351 * </ul>
1352 * </p>
1353 *
1354 * <p>Comparing <code>NaN</code> with <code>NaN</code> will
1355 * return <code>0</code>.</p>
1356 *
1357 * @param lhs the first <code>double</code>
1358 * @param rhs the second <code>double</code>
1359 * @return <code>-1</code> if lhs is less, <code>+1</code> if greater,
1360 * <code>0</code> if equal to rhs
1361 */
1362 public static int compare(double lhs, double rhs) {
1363 if (lhs < rhs) {
1364 return -1;
1365 }
1366 if (lhs > rhs) {
1367 return +1;
1368 }
1369 // Need to compare bits to handle 0.0 == -0.0 being true
1370 // compare should put -0.0 < +0.0
1371 // Two NaNs are also == for compare purposes
1372 // where NaN == NaN is false
1373 long lhsBits = Double.doubleToLongBits(lhs);
1374 long rhsBits = Double.doubleToLongBits(rhs);
1375 if (lhsBits == rhsBits) {
1376 return 0;
1377 }
1378 // Something exotic! A comparison to NaN or 0.0 vs -0.0
1379 // Fortunately NaN's long is > than everything else
1380 // Also negzeros bits < poszero
1381 // NAN: 9221120237041090560
1382 // MAX: 9218868437227405311
1383 // NEGZERO: -9223372036854775808
1384 if (lhsBits < rhsBits) {
1385 return -1;
1386 } else {
1387 return +1;
1388 }
1389 }
1390
1391 /**
1392 * <p>Compares two floats for order.</p>
1393 *
1394 * <p>This method is more comprehensive than the standard Java greater than,
1395 * less than and equals operators.</p>
1396 * <ul>
1397 * <li>It returns <code>-1</code> if the first value is less than the second.
1398 * <li>It returns <code>+1</code> if the first value is greater than the second.
1399 * <li>It returns <code>0</code> if the values are equal.
1400 * </ul>
1401 *
1402 * <p> The ordering is as follows, largest to smallest:
1403 * <ul>
1404 * <li>NaN
1405 * <li>Positive infinity
1406 * <li>Maximum float
1407 * <li>Normal positive numbers
1408 * <li>+0.0
1409 * <li>-0.0
1410 * <li>Normal negative numbers
1411 * <li>Minimum float (<code>-Float.MAX_VALUE</code>)
1412 * <li>Negative infinity
1413 * </ul>
1414 *
1415 * <p>Comparing <code>NaN</code> with <code>NaN</code> will return
1416 * <code>0</code>.</p>
1417 *
1418 * @param lhs the first <code>float</code>
1419 * @param rhs the second <code>float</code>
1420 * @return <code>-1</code> if lhs is less, <code>+1</code> if greater,
1421 * <code>0</code> if equal to rhs
1422 */
1423 public static int compare(float lhs, float rhs) {
1424 if (lhs < rhs) {
1425 return -1;
1426 }
1427 if (lhs > rhs) {
1428 return +1;
1429 }
1430 //Need to compare bits to handle 0.0 == -0.0 being true
1431 // compare should put -0.0 < +0.0
1432 // Two NaNs are also == for compare purposes
1433 // where NaN == NaN is false
1434 int lhsBits = Float.floatToIntBits(lhs);
1435 int rhsBits = Float.floatToIntBits(rhs);
1436 if (lhsBits == rhsBits) {
1437 return 0;
1438 }
1439 //Something exotic! A comparison to NaN or 0.0 vs -0.0
1440 //Fortunately NaN's int is > than everything else
1441 //Also negzeros bits < poszero
1442 //NAN: 2143289344
1443 //MAX: 2139095039
1444 //NEGZERO: -2147483648
1445 if (lhsBits < rhsBits) {
1446 return -1;
1447 } else {
1448 return +1;
1449 }
1450 }
1451
1452 //-----------------------------------------------------------------------
1453 /**
1454 * <p>Checks whether the <code>String</code> contains only
1455 * digit characters.</p>
1456 *
1457 * <p><code>Null</code> and empty String will return
1458 * <code>false</code>.</p>
1459 *
1460 * @param str the <code>String</code> to check
1461 * @return <code>true</code> if str contains only unicode numeric
1462 */
1463 public static boolean isDigits(String str) {
1464 if (StringUtils.isEmpty(str)) {
1465 return false;
1466 }
1467 for (int i = 0; i < str.length(); i++) {
1468 if (!Character.isDigit(str.charAt(i))) {
1469 return false;
1470 }
1471 }
1472 return true;
1473 }
1474
1475 /**
1476 * <p>Checks whether the String a valid Java number.</p>
1477 *
1478 * <p>Valid numbers include hexadecimal marked with the <code>0x</code>
1479 * qualifier, scientific notation and numbers marked with a type
1480 * qualifier (e.g. 123L).</p>
1481 *
1482 * <p><code>Null</code> and empty String will return
1483 * <code>false</code>.</p>
1484 *
1485 * @param str the <code>String</code> to check
1486 * @return <code>true</code> if the string is a correctly formatted number
1487 */
1488 public static boolean isNumber(String str) {
1489 if (StringUtils.isEmpty(str)) {
1490 return false;
1491 }
1492 char[] chars = str.toCharArray();
1493 int sz = chars.length;
1494 boolean hasExp = false;
1495 boolean hasDecPoint = false;
1496 boolean allowSigns = false;
1497 boolean foundDigit = false;
1498 // deal with any possible sign up front
1499 int start = (chars[0] == '-') ? 1 : 0;
1500 if (sz > start + 1) {
1501 if (chars[start] == '0' && chars[start + 1] == 'x') {
1502 int i = start + 2;
1503 if (i == sz) {
1504 return false; // str == "0x"
1505 }
1506 // checking hex (it can't be anything else)
1507 for (; i < chars.length; i++) {
1508 if ((chars[i] < '0' || chars[i] > '9')
1509 && (chars[i] < 'a' || chars[i] > 'f')
1510 && (chars[i] < 'A' || chars[i] > 'F')) {
1511 return false;
1512 }
1513 }
1514 return true;
1515 }
1516 }
1517 sz--; // don't want to loop to the last char, check it afterwords
1518 // for type qualifiers
1519 int i = start;
1520 // loop to the next to last char or to the last char if we need another digit to
1521 // make a valid number (e.g. chars[0..5] = "1234E")
1522 while (i < sz || (i < sz + 1 && allowSigns && !foundDigit)) {
1523 if (chars[i] >= '0' && chars[i] <= '9') {
1524 foundDigit = true;
1525 allowSigns = false;
1526
1527 } else if (chars[i] == '.') {
1528 if (hasDecPoint || hasExp) {
1529 // two decimal points or dec in exponent
1530 return false;
1531 }
1532 hasDecPoint = true;
1533 } else if (chars[i] == 'e' || chars[i] == 'E') {
1534 // we've already taken care of hex.
1535 if (hasExp) {
1536 // two E's
1537 return false;
1538 }
1539 if (!foundDigit) {
1540 return false;
1541 }
1542 hasExp = true;
1543 allowSigns = true;
1544 } else if (chars[i] == '+' || chars[i] == '-') {
1545 if (!allowSigns) {
1546 return false;
1547 }
1548 allowSigns = false;
1549 foundDigit = false; // we need a digit after the E
1550 } else {
1551 return false;
1552 }
1553 i++;
1554 }
1555 if (i < chars.length) {
1556 if (chars[i] >= '0' && chars[i] <= '9') {
1557 // no type qualifier, OK
1558 return true;
1559 }
1560 if (chars[i] == 'e' || chars[i] == 'E') {
1561 // can't have an E at the last byte
1562 return false;
1563 }
1564 if (chars[i] == '.') {
1565 if (hasDecPoint || hasExp) {
1566 // two decimal points or dec in exponent
1567 return false;
1568 }
1569 // single trailing decimal point after non-exponent is ok
1570 return foundDigit;
1571 }
1572 if (!allowSigns
1573 && (chars[i] == 'd'
1574 || chars[i] == 'D'
1575 || chars[i] == 'f'
1576 || chars[i] == 'F')) {
1577 return foundDigit;
1578 }
1579 if (chars[i] == 'l'
1580 || chars[i] == 'L') {
1581 // not allowing L with an exponent
1582 return foundDigit && !hasExp;
1583 }
1584 // last character is illegal
1585 return false;
1586 }
1587 // allowSigns is true iff the val ends in 'E'
1588 // found digit it to make sure weird stuff like '.' and '1E-' doesn't pass
1589 return !allowSigns && foundDigit;
1590 }
1591
1592 }