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1
5 package org.h2.value;
6
7 import java.sql.PreparedStatement  ;
8 import java.sql.SQLException ;
9
10 import org.h2.util.ByteUtils;
11 import org.h2.util.RandomUtils;
12 import org.h2.util.StringUtils;
13
14 public class ValueUuid extends Value {
15 public static final int PRECISION = 36;
16 private long high, low;
17
18 private ValueUuid(long high, long low) {
19 this.high = high;
20 this.low = low;
21 }
22
23 public int hashCode() {
24 return (int)((high >>> 32) ^ high ^ (low >>> 32) ^ low);
25 }
26
27 public static ValueUuid getNewRandom() {
28 long high = RandomUtils.getSecureLong();
29 long low = RandomUtils.getSecureLong();
30 high = (high & (~0xf000L)) | 0x4000L; low = (low & 0x3fffffffffffffffL) | 0x8000000000000000L; return new ValueUuid(high, low);
33 }
34
35 public static ValueUuid get(byte[] binary) {
36 if(binary.length < 32) {
37 return get(ByteUtils.convertBytesToString(binary));
38 }
39 long high = ByteUtils.readLong(binary, 0);
40 long low = ByteUtils.readLong(binary, 16);
41 return (ValueUuid) Value.cache(new ValueUuid(high, low));
42 }
43
44 public static ValueUuid get(long high, long low) {
45 return (ValueUuid) Value.cache(new ValueUuid(high, low));
46 }
47
48 public static ValueUuid get(String s) {
49 long high = 0, low = 0;
50 int i=0;
51 for(int j=0; i<s.length() && j<16; i++) {
52 char ch = s.charAt(i);
53 if(ch != '-') {
54 high = (high << 4) | Character.digit(ch, 16);
55 j++;
56 }
57 }
58 for(int j=0; i<s.length() && j<16; i++) {
59 char ch = s.charAt(i);
60 if(ch != '-') {
61 low = (low << 4) | Character.digit(ch, 16);
62 j++;
63 }
64 }
65 return (ValueUuid) Value.cache(new ValueUuid(high, low));
66 }
67
68 public String getSQL() {
69 return StringUtils.quoteStringSQL(getString());
70 }
71
72 public int getType() {
73 return Value.UUID;
74 }
75
76 public long getPrecision() {
77 return PRECISION;
78 }
79
80 public int getDisplaySize() {
81 return 0;
82 }
83
84 private void appendHex(StringBuffer buff, long x, int bytes) {
85 for (int i = bytes*8-4; i >= 0; i-=8) {
86 buff.append(Integer.toHexString((int)(x >> i) & 0xf));
87 buff.append(Integer.toHexString((int)(x >> (i-4)) & 0xf));
88 }
89 }
90
91 public String getString() {
92 StringBuffer buff = new StringBuffer (36);
93 appendHex(buff, high >> 32, 4);
94 buff.append('-');
95 appendHex(buff, high >> 16, 2);
96 buff.append('-');
97 appendHex(buff, high, 2);
98 buff.append('-');
99 appendHex(buff, low >> 48, 2);
100 buff.append('-');
101 appendHex(buff, low, 6);
102 return buff.toString();
103 }
104
105 protected int compareSecure(Value o, CompareMode mode) {
106 ValueUuid v = (ValueUuid) o;
107 if (high == v.high) {
108 return (low == v.low) ? 0 : (low > v.low ? 1 : -1);
109 } else {
110 return high > v.high ? 1 : -1;
111 }
112 }
113
114 protected boolean isEqual(Value v) {
115 return v instanceof ValueUuid && compareSecure(v, null) == 0;
116 }
117
118 public Object getObject() {
119 return new long[]{high, low};
121 }
122
123 public byte[] getBytes() {
124 byte[] buff = new byte[16];
125 for(int i=0; i<8; i++) {
126 buff[i] = (byte)((high >> (8*(8-i))) & 255);
127 buff[8+i] = (byte)((low >> (8*(8-i))) & 255);
128 }
129 return buff;
130 }
131
132 public void set(PreparedStatement prep, int parameterIndex) throws SQLException {
133 prep.setBytes(parameterIndex, getBytes());
134 }
135
136 public long getHigh() {
137 return high;
138 }
139
140 public long getLow() {
141 return low;
142 }
143
144 }
145 |
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