-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
IndexKeyStorage.java
104 lines (91 loc) · 3.08 KB
/
IndexKeyStorage.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
/*
* Copyright (c) 2002-2019 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.index.schema;
import java.io.File;
import java.io.IOException;
import org.neo4j.index.internal.gbptree.Layout;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCursor;
import static java.lang.String.format;
class IndexKeyStorage<KEY extends NativeIndexKey<KEY>> extends SimpleEntryStorage<KEY,IndexKeyStorage.KeyEntryCursor<KEY>>
{
private static final byte KEY_TYPE = 1;
private final Layout<KEY,?> layout;
IndexKeyStorage( FileSystemAbstraction fs, File file, ByteBufferFactory byteBufferFactory, int blockSize, Layout<KEY,?> layout ) throws IOException
{
super( fs, file, byteBufferFactory, blockSize );
this.layout = layout;
}
@Override
void add( KEY key, PageCursor pageCursor ) throws IOException
{
int entrySize = TYPE_SIZE + BlockEntry.keySize( layout, key );
prepareWrite( entrySize );
pageCursor.putByte( KEY_TYPE );
BlockEntry.write( pageCursor, layout, key );
}
@Override
KeyEntryCursor<KEY> reader( PageCursor pageCursor )
{
return new KeyEntryCursor<>( pageCursor, layout );
}
static class KeyEntryCursor<KEY> implements BlockEntryCursor<KEY,Void>
{
private final PageCursor pageCursor;
private final Layout<KEY,?> layout;
private final KEY key;
KeyEntryCursor( PageCursor pageCursor, Layout<KEY,?> layout )
{
this.pageCursor = pageCursor;
this.layout = layout;
this.key = layout.newKey();
}
@Override
public boolean next() throws IOException
{
byte type = pageCursor.getByte();
if ( type == STOP_TYPE )
{
return false;
}
if ( type != KEY_TYPE )
{
throw new RuntimeException( format( "Unexpected entry type. Expected %d or %d, but was %d.", STOP_TYPE, KEY_TYPE, type ) );
}
BlockEntry.read( pageCursor, layout, key );
return true;
}
@Override
public KEY key()
{
return key;
}
@Override
public Void value()
{
return null;
}
@Override
public void close() throws IOException
{
pageCursor.close();
}
}
}