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1
5 package org.h2.index;
6
7 import java.sql.SQLException  ;
8
9 import org.h2.engine.Session;
10 import org.h2.message.Message;
11 import org.h2.result.Row;
12 import org.h2.result.SearchRow;
13 import org.h2.table.Column;
14 import org.h2.table.RangeTable;
15 import org.h2.value.Value;
16 import org.h2.value.ValueLong;
17
18 public class RangeIndex extends Index {
19
20 private long min, max;
21
22 public RangeIndex(RangeTable table, Column[] columns, long min, long max) {
23 super(table, 0, "RANGE_INDEX", columns, IndexType.createNonUnique(true));
24 this.min = min;
25 this.max = max;
26 }
27
28 public void close(Session session) throws SQLException {
29 }
30
31 public void add(Session session, Row row) throws SQLException {
32 throw Message.getUnsupportedException();
33 }
34
35 public void remove(Session session, Row row) throws SQLException {
36 throw Message.getUnsupportedException();
37 }
38
39 public Cursor find(Session session, SearchRow first, SearchRow last) throws SQLException {
40 long start = Math.max(min, first==null ? min : first.getValue(0).getLong());
41 long end = Math.min(max, last==null ? max : last.getValue(0).getLong());
42 return new RangeCursor(start, end);
43 }
44
45 public int getCost(int[] masks) throws SQLException {
46 return 1;
47 }
48
49 public String getCreateSQL() {
50 return null;
51 }
52
53 public void remove(Session session) throws SQLException {
54 throw Message.getUnsupportedException();
55 }
56
57 public void truncate(Session session) throws SQLException {
58 throw Message.getUnsupportedException();
59 }
60
61 public boolean needRebuild() {
62 return false;
63 }
64
65 public void checkRename() throws SQLException {
66 throw Message.getUnsupportedException();
67 }
68
69 public boolean canGetFirstOrLast(boolean first) {
70 return true;
71 }
72
73 public Value findFirstOrLast(Session session, boolean first) throws SQLException {
74 return ValueLong.get(first ? min : max);
75 }
76
77 }
78 |
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