package org.apache.lucene.codecs.simpletext;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_DIAG_KEY;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_DIAG_VALUE;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_DOCCOUNT;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_FILE;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_NUM_DIAG;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_NUM_FILES;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_USECOMPOUND;
import static org.apache.lucene.codecs.simpletext.SimpleTextSegmentInfoWriter.SI_VERSION;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.lucene.codecs.SegmentInfoReader;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.SegmentInfo;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.StringHelper;
/**
* reads plaintext segments files
* <p>
* <b><font color="red">FOR RECREATIONAL USE ONLY</font></B>
* @lucene.experimental
*/
public class SimpleTextSegmentInfoReader extends SegmentInfoReader {
@Override
public SegmentInfo read(Directory directory, String segmentName, IOContext context) throws IOException {
BytesRef scratch = new BytesRef();
String segFileName = IndexFileNames.segmentFileName(segmentName, "", SimpleTextSegmentInfoFormat.SI_EXTENSION);
IndexInput input = directory.openInput(segFileName, context);
boolean success = false;
try {
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_VERSION);
final String version = readString(SI_VERSION.length, scratch);
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_DOCCOUNT);
final int docCount = Integer.parseInt(readString(SI_DOCCOUNT.length, scratch));
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_USECOMPOUND);
final boolean isCompoundFile = Boolean.parseBoolean(readString(SI_USECOMPOUND.length, scratch));
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_NUM_DIAG);
int numDiag = Integer.parseInt(readString(SI_NUM_DIAG.length, scratch));
Map<String,String> diagnostics = new HashMap<String,String>();
for (int i = 0; i < numDiag; i++) {
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_DIAG_KEY);
String key = readString(SI_DIAG_KEY.length, scratch);
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_DIAG_VALUE);
String value = readString(SI_DIAG_VALUE.length, scratch);
diagnostics.put(key, value);
}
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_NUM_FILES);
int numFiles = Integer.parseInt(readString(SI_NUM_FILES.length, scratch));
Set<String> files = new HashSet<String>();
for (int i = 0; i < numFiles; i++) {
SimpleTextUtil.readLine(input, scratch);
assert StringHelper.startsWith(scratch, SI_FILE);
String fileName = readString(SI_FILE.length, scratch);
files.add(fileName);
}
SegmentInfo info = new SegmentInfo(directory, version, segmentName, docCount,
isCompoundFile, null, diagnostics);
info.setFiles(files);
success = true;
return info;
} finally {
if (!success) {
IOUtils.closeWhileHandlingException(input);
} else {
input.close();
}
}
}
private String readString(int offset, BytesRef scratch) {
return new String(scratch.bytes, scratch.offset+offset, scratch.length-offset, IOUtils.CHARSET_UTF_8);
}
}