01 package gate.creole.annic.apache.lucene.index;
02
03 /**
04 * Copyright 2004 The Apache Software Foundation
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 import java.io.IOException;
20
21 import gate.creole.annic.apache.lucene.store.Directory;
22 import gate.creole.annic.apache.lucene.store.InputStream;
23 import gate.creole.annic.apache.lucene.document.Document;
24 import gate.creole.annic.apache.lucene.document.Field;
25
26 /**
27 * Class responsible for access to stored document fields.
28 *
29 * It uses <segment>.fdt and <segment>.fdx; files.
30 *
31 * @version $Id: FieldsReader.java 529 2004-10-05 11:55:26Z niraj $
32 */
33 final class FieldsReader {
34 private FieldInfos fieldInfos;
35 private InputStream fieldsStream;
36 private InputStream indexStream;
37 private int size;
38
39 FieldsReader(Directory d, String segment, FieldInfos fn) throws IOException {
40 fieldInfos = fn;
41
42 fieldsStream = d.openFile(segment + ".fdt");
43 indexStream = d.openFile(segment + ".fdx");
44
45 size = (int)(indexStream.length() / 8);
46 }
47
48 final void close() throws IOException {
49 fieldsStream.close();
50 indexStream.close();
51 }
52
53 final int size() {
54 return size;
55 }
56
57 final Document doc(int n) throws IOException {
58 indexStream.seek(n * 8L);
59 long position = indexStream.readLong();
60 fieldsStream.seek(position);
61
62 Document doc = new Document();
63 int numFields = fieldsStream.readVInt();
64 for (int i = 0; i < numFields; i++) {
65 int fieldNumber = fieldsStream.readVInt();
66 FieldInfo fi = fieldInfos.fieldInfo(fieldNumber);
67
68 byte bits = fieldsStream.readByte();
69
70 doc.add(new Field(fi.name, // name
71 fieldsStream.readString(), // read value
72 true, // stored
73 fi.isIndexed, // indexed
74 (bits & 1) != 0, fi.storeTermVector)); // vector
75 }
76
77 return doc;
78 }
79 }
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