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/*
* Copyright (c) 2017 VMware, Inc. All Rights Reserved.
*
* 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.
*/
package com.vmware.xenon.services.common;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.codecs.FieldInfosFormat;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.DocValuesType;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.FieldInfos;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.SegmentInfo;
import org.apache.lucene.store.ChecksumIndexInput;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.IndexOutput;
/**
* Copy of {@link org.apache.lucene.codecs.lucene60.Lucene60FieldInfosFormat}. The original is final and hooks
* cannot be attached. The only hook needed is caching of FieldInfo instances. The changed code is delimited
* with ///////////////////.
*
*/
public final class Lucene60FieldInfosFormatWithCache extends FieldInfosFormat {
///////////////////
private final FieldInfoCache cache = new FieldInfoCache();
///////////////////
/** Sole constructor. */
public Lucene60FieldInfosFormatWithCache() {
}
@Override
public FieldInfos read(Directory directory, SegmentInfo segmentInfo, String segmentSuffix, IOContext context) throws
IOException {
final String fileName = IndexFileNames.segmentFileName(segmentInfo.name, segmentSuffix, EXTENSION);
try (ChecksumIndexInput input = directory.openChecksumInput(fileName, context)) {
Throwable priorE = null;
FieldInfo[] infos = null;
try {
CodecUtil.checkIndexHeader(input,
Lucene60FieldInfosFormatWithCache.CODEC_NAME,
Lucene60FieldInfosFormatWithCache.FORMAT_START,
Lucene60FieldInfosFormatWithCache.FORMAT_CURRENT,
segmentInfo.getId(), segmentSuffix);
final int size = input.readVInt(); //read in the size
infos = new FieldInfo[size];
// previous field's attribute map, we share when possible:
Map lastAttributes = Collections.emptyMap();
for (int i = 0; i < size; i++) {
String name = input.readString();
final int fieldNumber = input.readVInt();
if (fieldNumber < 0) {
throw new CorruptIndexException(
"invalid field number for field: " + name + ", fieldNumber=" + fieldNumber, input);
}
byte bits = input.readByte();
boolean storeTermVector = (bits & STORE_TERMVECTOR) != 0;
boolean omitNorms = (bits & OMIT_NORMS) != 0;
boolean storePayloads = (bits & STORE_PAYLOADS) != 0;
final IndexOptions indexOptions = getIndexOptions(input, input.readByte());
// DV Types are packed in one byte
final DocValuesType docValuesType = getDocValuesType(input, input.readByte());
final long dvGen = input.readLong();
Map attributes = input.readMapOfStrings();
// just use the last field's map if its the same
if (attributes.equals(lastAttributes)) {
attributes = lastAttributes;
}
lastAttributes = attributes;
int pointDimensionCount = input.readVInt();
int pointNumBytes;
if (pointDimensionCount != 0) {
pointNumBytes = input.readVInt();
} else {
pointNumBytes = 0;
}
try {
//////////////////////
infos[i] = this.cache
.dedupFieldInfo(name, fieldNumber, storeTermVector, omitNorms, storePayloads,
indexOptions, docValuesType, dvGen, attributes,
pointDimensionCount, pointNumBytes);
//////////////////////
} catch (IllegalStateException e) {
throw new CorruptIndexException(
"invalid fieldinfo for field: " + name + ", fieldNumber=" + fieldNumber, input, e);
}
}
} catch (Throwable exception) {
priorE = exception;
} finally {
CodecUtil.checkFooter(input, priorE);
}
//////////////////////
return this.cache.dedupFieldInfos(infos);
//////////////////////
}
}
static {
// We "mirror" DocValues enum values with the constants below; let's try to ensure if we add a new DocValuesType while this format is
// still used for writing, we remember to fix this encoding:
assert DocValuesType.values().length == 6;
}
private static byte docValuesByte(DocValuesType type) {
switch (type) {
case NONE:
return 0;
case NUMERIC:
return 1;
case BINARY:
return 2;
case SORTED:
return 3;
case SORTED_SET:
return 4;
case SORTED_NUMERIC:
return 5;
default:
// BUG
throw new AssertionError("unhandled DocValuesType: " + type);
}
}
private static DocValuesType getDocValuesType(IndexInput input, byte b) throws IOException {
switch (b) {
case 0:
return DocValuesType.NONE;
case 1:
return DocValuesType.NUMERIC;
case 2:
return DocValuesType.BINARY;
case 3:
return DocValuesType.SORTED;
case 4:
return DocValuesType.SORTED_SET;
case 5:
return DocValuesType.SORTED_NUMERIC;
default:
throw new CorruptIndexException("invalid docvalues byte: " + b, input);
}
}
static {
// We "mirror" IndexOptions enum values with the constants below; let's try to ensure if we add a new IndexOption while this format is
// still used for writing, we remember to fix this encoding:
assert IndexOptions.values().length == 5;
}
private static byte indexOptionsByte(IndexOptions indexOptions) {
switch (indexOptions) {
case NONE:
return 0;
case DOCS:
return 1;
case DOCS_AND_FREQS:
return 2;
case DOCS_AND_FREQS_AND_POSITIONS:
return 3;
case DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS:
return 4;
default:
// BUG:
throw new AssertionError("unhandled IndexOptions: " + indexOptions);
}
}
private static IndexOptions getIndexOptions(IndexInput input, byte b) throws IOException {
switch (b) {
case 0:
return IndexOptions.NONE;
case 1:
return IndexOptions.DOCS;
case 2:
return IndexOptions.DOCS_AND_FREQS;
case 3:
return IndexOptions.DOCS_AND_FREQS_AND_POSITIONS;
case 4:
return IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS;
default:
// BUG
throw new CorruptIndexException("invalid IndexOptions byte: " + b, input);
}
}
@Override
public void write(Directory directory, SegmentInfo segmentInfo, String segmentSuffix, FieldInfos infos,
IOContext context) throws IOException {
final String fileName = IndexFileNames.segmentFileName(segmentInfo.name, segmentSuffix, EXTENSION);
try (IndexOutput output = directory.createOutput(fileName, context)) {
CodecUtil.writeIndexHeader(output, Lucene60FieldInfosFormatWithCache.CODEC_NAME,
Lucene60FieldInfosFormatWithCache.FORMAT_CURRENT, segmentInfo.getId(), segmentSuffix);
output.writeVInt(infos.size());
for (FieldInfo fi : infos) {
fi.checkConsistency();
output.writeString(fi.name);
output.writeVInt(fi.number);
byte bits = 0x0;
if (fi.hasVectors()) {
bits |= STORE_TERMVECTOR;
}
if (fi.omitsNorms()) {
bits |= OMIT_NORMS;
}
if (fi.hasPayloads()) {
bits |= STORE_PAYLOADS;
}
output.writeByte(bits);
output.writeByte(indexOptionsByte(fi.getIndexOptions()));
// pack the DV type and hasNorms in one byte
output.writeByte(docValuesByte(fi.getDocValuesType()));
output.writeLong(fi.getDocValuesGen());
output.writeMapOfStrings(fi.attributes());
int pointDimensionCount = fi.getPointDimensionCount();
output.writeVInt(pointDimensionCount);
if (pointDimensionCount != 0) {
output.writeVInt(fi.getPointNumBytes());
}
}
CodecUtil.writeFooter(output);
}
}
///////////////////
public void handleMaintenance() {
this.cache.handleMaintenance();
}
///////////////////
/** Extension of field infos */
static final String EXTENSION = "fnm";
// Codec header
static final String CODEC_NAME = "Lucene60FieldInfos";
static final int FORMAT_START = 0;
static final int FORMAT_CURRENT = FORMAT_START;
// Field flags
static final byte STORE_TERMVECTOR = 0x1;
static final byte OMIT_NORMS = 0x2;
static final byte STORE_PAYLOADS = 0x4;
}
