1 | /* |
2 | * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0, |
3 | * and the EPL 1.0 (http://h2database.com/html/license.html). |
4 | * Initial Developer: H2 Group |
5 | */ |
6 | package org.h2.index; |
7 | |
8 | import java.util.ArrayList; |
9 | import org.h2.message.DbException; |
10 | import org.h2.result.Row; |
11 | import org.h2.result.SearchRow; |
12 | |
13 | /** |
14 | * An index for a meta data table. |
15 | * This index can only scan through all rows, search is not supported. |
16 | */ |
17 | public class MetaCursor implements Cursor { |
18 | |
19 | private Row current; |
20 | private final ArrayList<Row> rows; |
21 | private int index; |
22 | |
23 | MetaCursor(ArrayList<Row> rows) { |
24 | this.rows = rows; |
25 | } |
26 | |
27 | @Override |
28 | public Row get() { |
29 | return current; |
30 | } |
31 | |
32 | @Override |
33 | public SearchRow getSearchRow() { |
34 | return current; |
35 | } |
36 | |
37 | @Override |
38 | public boolean next() { |
39 | current = index >= rows.size() ? null : rows.get(index++); |
40 | return current != null; |
41 | } |
42 | |
43 | @Override |
44 | public boolean previous() { |
45 | throw DbException.throwInternalError(); |
46 | } |
47 | |
48 | } |