|
1
5 package org.h2.util;
6
7 import java.math.BigDecimal  ;
8 import java.sql.SQLException ;
9
10 import org.h2.engine.Constants;
11 import org.h2.message.Message;
12
13
16
17 public class MathUtils {
18 public static int roundUp(int x, int blockSizePowerOf2) {
20 return (x + blockSizePowerOf2 - 1) & (-blockSizePowerOf2);
21 }
22
23 public static void checkPowerOf2(int len) {
24 if((len & (len-1)) != 0 && len > 0) {
25 throw Message.getInternalError("not a power of 2: " + len);
26 }
27 }
28
29 public static long scaleUp50Percent(long start, long min, long blockSize) {
30 while(start < min) {
31 start += start / 2;
32 start += start % blockSize;
33 }
34 return start;
35 }
36
37 public static BigDecimal setScale(BigDecimal bd, int scale) throws SQLException {
38 if(scale > Constants.BIGDECIMAL_SCALE_MAX) {
39 throw Message.getInvalidValueException(""+scale, "scale");
40 } else if(scale < 0) {
41 throw Message.getInvalidValueException(""+scale, "scale");
42 }
43 return bd.setScale(scale, BigDecimal.ROUND_HALF_UP);
44 }
45
46 public static byte decodeByte(String s) {
47 return Byte.decode(s).byteValue();
48 }
49
50 public static short decodeShort(String s) {
51 return Short.decode(s).shortValue();
52 }
53
54 public static int decodeInt(String s) {
55 return Integer.decode(s).intValue();
56 }
57
58 public static long decodeLong(String s) {
59 return Long.decode(s).longValue();
60 }
61
62 public static int convertLongToInt(long l) {
63 if(l<=Integer.MIN_VALUE) {
64 return Integer.MIN_VALUE;
65 } else if(l>=Integer.MAX_VALUE) {
66 return Integer.MAX_VALUE;
67 } else {
68 return (int) l;
69 }
70 }
71
72 }
73 |
Popular Tags |
Java API By Example, From Geeks To Geeks.