package org.apache.lucene.index;
/**
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.InputStream;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
/**
* Class responsible for access to stored document fields.
*
* It uses <segment>.fdt and <segment>.fdx; files.
*
* @version $Id: FieldsReader.java,v 1.7 2004/03/29 22:48:02 cutting Exp $
*/
final class FieldsReader {
private FieldInfos fieldInfos;
private InputStream fieldsStream;
private InputStream indexStream;
private int size;
FieldsReader(Directory d, String segment, FieldInfos fn) throws IOException {
fieldInfos = fn;
fieldsStream = d.openFile(segment + ".fdt");
indexStream = d.openFile(segment + ".fdx");
size = (int)(indexStream.length() / 8);
}
final void close() throws IOException {
fieldsStream.close();
indexStream.close();
}
final int size() {
return size;
}
final Document doc(int n) throws IOException {
indexStream.seek(n * 8L);
long position = indexStream.readLong();
fieldsStream.seek(position);
Document doc = new Document();
int numFields = fieldsStream.readVInt();
for (int i = 0; i < numFields; i++) {
int fieldNumber = fieldsStream.readVInt();
FieldInfo fi = fieldInfos.fieldInfo(fieldNumber);
byte bits = fieldsStream.readByte();
doc.add(new Field(fi.name, // name
fieldsStream.readString(), // read value
true, // stored
fi.isIndexed, // indexed
(bits & 1) != 0, fi.storeTermVector)); // vector
}
return doc;
}
}
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