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comparison base/src/java/math/BigDecimal.d @ 98:48d4ee626868

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rm databinding.observable seems to be duplicate, databinding.beans now building
author Frank Benoit <benoit@tionex.de>
date Wed, 22 Apr 2009 07:30:21 +0200
parents b2d6122fa189
children 9f4c18c268b2
comparison
equal deleted inserted replaced
97:c86eb8b3098e 98:48d4ee626868
11 static int ROUND_HALF_EVEN; 11 static int ROUND_HALF_EVEN;
12 static int ROUND_HALF_UP; 12 static int ROUND_HALF_UP;
13 static int ROUND_UNNECESSARY; 13 static int ROUND_UNNECESSARY;
14 static int ROUND_UP; 14 static int ROUND_UP;
15 15
16 private BigInteger intVal;
17 private int scale_;
18 private int intCompact;
19 private int precision;
20 private static const MAX_BIGINT_BITS = 62;
21
16 this(BigInteger val){ 22 this(BigInteger val){
17 implMissing(__FILE__, __LINE__); 23 implMissing(__FILE__, __LINE__);
18 } 24 }
19 this(BigInteger unscaledVal, int scale){ 25 this(BigInteger unscaledVal, int scale_){
20 implMissing(__FILE__, __LINE__); 26 this.intVal = unscaledVal;
27 this.scale_ = scale_;
21 } 28 }
22 this(double val){ 29 this(double val){
23 implMissing(__FILE__, __LINE__); 30 if (double.nan is val || double.infinity is val )
31 throw new NumberFormatException("Infinite or NaN");
32
33 // Translate the double into sign, exponent and significand, according
34 // to the formulae in JLS, Section 20.10.22.
35 long valBits = *cast(long*) & val;
36 int sign = ((valBits >> 63)==0 ? 1 : -1);
37 int exponent = cast(int) ((valBits >> 52) & 0x7ffL);
38 long significand = (exponent==0 ? (valBits & ((1L<<52) - 1)) << 1
39 : (valBits & ((1L<<52) - 1)) | (1L<<52));
40 exponent -= 1075;
41 // At this point, val == sign * significand * 2**exponent.
42
43 /*
44 * Special case zero to supress nonterminating normalization
45 * and bogus scale calculation.
46 */
47 if (significand == 0) {
48 intVal = BigInteger.ZERO;
49 intCompact = 0;
50 precision = 1;
51 return;
52 }
53
54 // Normalize
55 while((significand & 1) == 0) { // i.e., significand is even
56 significand >>= 1;
57 exponent++;
58 }
59
60 // Calculate intVal and scale
61 intVal = BigInteger.valueOf(sign*significand);
62 if (exponent < 0) {
63 intVal = intVal.multiply(BigInteger.valueOf(5).pow(-exponent));
64 scale_ = -exponent;
65 } else if (exponent > 0) {
66 intVal = intVal.multiply(BigInteger.valueOf(2).pow(exponent));
67 }
68 if (intVal.bitLength() <= MAX_BIGINT_BITS) {
69 intCompact = intVal.longValue();
70 }
24 } 71 }
25 this(String val){ 72 this(String val){
26 implMissing(__FILE__, __LINE__); 73 implMissing(__FILE__, __LINE__);
27 } 74 }
28 BigDecimal abs(){ 75 BigDecimal abs(){
43 } 90 }
44 BigDecimal divide(BigDecimal val, int roundingMode){ 91 BigDecimal divide(BigDecimal val, int roundingMode){
45 implMissing(__FILE__, __LINE__); 92 implMissing(__FILE__, __LINE__);
46 return null; 93 return null;
47 } 94 }
48 BigDecimal divide(BigDecimal val, int scale, int roundingMode){ 95 BigDecimal divide(BigDecimal val, int scale_, int roundingMode){
49 implMissing(__FILE__, __LINE__); 96 implMissing(__FILE__, __LINE__);
50 return null; 97 return null;
51 } 98 }
52 double doubleValue(){ 99 double doubleValue(){
53 implMissing(__FILE__, __LINE__); 100 implMissing(__FILE__, __LINE__);
97 implMissing(__FILE__, __LINE__); 144 implMissing(__FILE__, __LINE__);
98 return null; 145 return null;
99 } 146 }
100 int scale(){ 147 int scale(){
101 implMissing(__FILE__, __LINE__); 148 implMissing(__FILE__, __LINE__);
102 return 0; 149 return this.scale_;
103 } 150 }
104 BigDecimal setScale(int scale){ 151 BigDecimal setScale(int scale_){
105 implMissing(__FILE__, __LINE__); 152 implMissing(__FILE__, __LINE__);
106 return null; 153 return null;
107 } 154 }
108 BigDecimal setScale(int scale, int roundingMode){ 155 BigDecimal setScale(int scale_, int roundingMode){
109 implMissing(__FILE__, __LINE__); 156 implMissing(__FILE__, __LINE__);
110 return null; 157 return null;
111 } 158 }
112 int signum(){ 159 int signum(){
113 implMissing(__FILE__, __LINE__); 160 implMissing(__FILE__, __LINE__);
131 } 178 }
132 static BigDecimal valueOf(long val){ 179 static BigDecimal valueOf(long val){
133 implMissing(__FILE__, __LINE__); 180 implMissing(__FILE__, __LINE__);
134 return null; 181 return null;
135 } 182 }
136 static BigDecimal valueOf(long unscaledVal, int scale){ 183 static BigDecimal valueOf(long unscaledVal, int scale_){
137 implMissing(__FILE__, __LINE__); 184 implMissing(__FILE__, __LINE__);
138 return null; 185 return null;
139 } 186 }
140 } 187 }
141 188