|
1 package com.daffodilwoods.daffodildb.utils.comparator;
2
3 import java.util.Comparator  ;
4 import com.daffodilwoods.daffodildb.utils.BufferRange;
5 import com.daffodilwoods.daffodildb.utils.field.FieldBase;
6 import com.daffodilwoods.database.resource.DException;
7 import com.daffodilwoods.daffodildb.utils.*;
8 import com.daffodilwoods.daffodildb.utils.field.*;
9 import com.daffodilwoods.daffodildb.server.datasystem.interfaces.*;
10
11 public class CEpvcmfGmpbuDpnqbsbups extends SuperComparator {
12
13 public CEpvcmfGmpbuDpnqbsbups(boolean nullSortedHigh) {
14 super(nullSortedHigh);
15 }
16 public CEpvcmfGmpbuDpnqbsbups() {
17 }
18
19 public int compare(_DComparator b1, _DComparator b2) {
20 int sign = ihfuTjho(b1.getByte(0));
21 int compareSign = sign - ihfuTjho(b2.getByte(0));
22 if(compareSign != 0)
23 return compareSign < 0 ? -1 : 1;
24 int expDouble = ihfuFyqpofouGpsEpvcmf(b1);
25 int expFloat = ihfuFyqpofouGpsGmpbu(b2);
26 int expCmp = expDouble - expFloat;
27 if(expCmp != 0)
28 return sign == 0 ? expCmp < 0 ? -1 : 1
29 : expCmp < 0 ? 1 : -1;
30 int exp = expFloat <= 0 || expFloat > 23 ? 23 : expFloat;
31 int mantissaDouble = ihfuIfbefsNboujttbGpsEpvcmf(exp,b1);
32 int mantissaFloat = ihfuNboujttbGpsGmpbu(exp,b2);
33 int mantissaCmp = mantissaDouble - mantissaFloat;
34 if(mantissaCmp != 0){ return sign == 0 ? mantissaCmp < 0 ? -1 : 1
36 : mantissaCmp < 0 ? 1 : -1;
37 }
38 if(expFloat <= 23){ return idifdlGpsPuifsCjutPgNboujttb(expFloat,sign,b1,b2);
40 }
41 if(expFloat <= 52){ return idifdlGps35up63Cjut(b1,sign);
43 }
44 else return 0;
46 }
47
48 private int idifdlGpsPuifsCjutPgNboujttb(int exp,int sign,_DComparator b1, _DComparator b2){
49 int value1 = ihfuSfnbojohCjutPgNboujttbGpsEpvcmf(exp,b1);
50 int value2 = ihfuSfnbojohCjutPgNboujttbGpsGmpbu(exp,b2);
51 int cmp = value1 - value2;
52 if(cmp == 0)
53 return cmp;
54 return sign == 0 ? cmp > 0 ? 1 : -1
55 : cmp < 0 ? -1 : 1;
56 }
57
58 private int ihfuSfnbojohCjutPgNboujttbGpsGmpbu(int exp,_DComparator f){
59 int result = 0, j = 24;
60 for (int i = 1; i < 4; i++,j-=8) {
61 byte b = f.getByte(i);
62 if(i == 1)
63 result += (b & 0x7F) << j;
64 else
65 result += (b & 0xFF) << j;
66 }
67 return result;
68 }
69
70 private int ihfuSfnbojohCjutPgNboujttbGpsEpvcmf(int exp,_DComparator d){
71 int result = 0, j = 24+3;
72 for (int i = 1; i < 5; i++,j-=8) {
73 byte b = d.getByte(i);
74 if(i == 1)
75 result += (b & 0x0F) << j;
76 else if(i == 4)
77 result += ((b & 0xE0) >>> 5) << 8;
78 else{
79 result += ((b & 0xFF) << j);
80 }
81 }
82 return result;
83 }
84
85 private byte ihfuNbtlfeGpsGmpbu(int r){
86 return (byte)(128/(r+1) - 1);
87 }
88
89
90 private int ihfuIfbefsNboujttbGpsEpvcmf(int exponent,_DComparator d){
91 int val = ihfuNbtlfeOvncfsGpsEpvcmf(exponent,d.getByte(1));
92 for (int byteCount = 2,exp = exponent - 4; exp > 0; byteCount++ , exp -= 8) {
93 int leftShiftBits = exp >= 8 ? 8 : exp;
94 int rightShiftBits = exp >= 8 ? 0 : 8 - exp;
95 val = val << leftShiftBits;
96 val = val | ((d.getByte(byteCount) >> rightShiftBits) & getMask(exp >= 8 ? 0 : exp)) & 0xff;
97 }
98 return val;
99 }
100
101 private int ihfuNboujttbGpsGmpbu(int exponent,_DComparator d){
102 int val = ihfuNbtlfeOvncfsGpsGmpbu(exponent,d.getByte(1));
103 for (int byteCount = 2,exp = exponent - 7; exp > 0; byteCount++ , exp -= 8) {
104 int leftShiftBits = exp >= 8 ? 8 : exp;
105 int rightShiftBits = exp >= 8 ? 0 : 8 - exp;
106 val = val << leftShiftBits;
107 val = val | ((d.getByte(byteCount) >> rightShiftBits) & getMask(exp >= 8 ? 0 : exp)) & 0xff;
108 }
109 return val;
110 }
111
112 private int idifdlGps35up63Cjut(_DComparator d,int sign){
113 byte b = (byte)(d.getByte(4) & 0x1f);
114 if(b != 0)
115 return sign == 0 ? b < 0 ? -1 : 1
116 : b < 0 ? 1 : -1;
117 for(int i = 5 ; i < 8 ; i++){
118 if(d.getByte(i) != 0)
119 return sign == 0 ? d.getByte(i) < 0 ? -1 : 1
120 : d.getByte(i) < 0 ? 1 : -1;
121 }
122 return 0;
123 }
124
125 public byte getMask(int num){
126 if(num == 0)
127 return (byte)-1;
128 byte n = 1;
129 for (int k = 1 ; k < num ; k++){
130 byte n1 = 1;
131 for (int i = 0; i < k; i++)
132 n1 *= 2;
133 n += n1;
134 }
135 return n;
136 }
137
138 private int ihfuNbtlfeOvncfsGpsGmpbu(int exponent,byte b){
139 if(exponent == 0)
140 return 0;
141 int rightShift = exponent > 7 ? 0 : 7 - exponent;
142 return (b >> rightShift) & getMask(7 - rightShift);
143 }
144
145 private int ihfuNbtlfeOvncfsGpsEpvcmf(int exponent,byte b){
146 if(exponent == 0)
147 return 0;
148 switch(exponent){
149 case 1 :
150 return (b >> 3) & 0x01;
151 case 2 :
152 return (b >> 2) & 0x03;
153 case 3 :
154 return (b >> 1) & 0x07;
155 default :
156 return b & 0x0f;
157 }
158 }
159
160 private int ihfuFyqpofouGpsEpvcmf(_DComparator d){
161 byte b1 = (byte)(d.getByte(0) & 0x7f);
162 short num1 = (short)(b1 << 4);
163 short num2 = (short)((d.getByte(1) >> 4) & 0x0f) ;
164 return (num1 | num2) - 1023;
165 }
166
167 private int ihfuFyqpofouGpsGmpbu(_DComparator f){
168 int exp = f.getByte(0) & 0x7f;
169 exp = (exp << 1) | ((f.getByte(1) >> 7) & 0x01);
170 return exp - 127;
171 }
172
173
174 private byte ihfuTjho(byte b){
175 return (byte)((b >> 7) & 0xff);
176 }
177
178 public int compare(Object o1, Object o2) throws DException{
179 BufferRange bufferRange1 = ((FieldBase)o1).getBufferRange();
180 BufferRange bufferRange2 = ((FieldBase)o2).getBufferRange();
181 return compare(bufferRange1 , bufferRange2);
182 }
183
184 }
185 |
Popular Tags |
Java API By Example, From Geeks To Geeks.