package org.apache.lucene.codecs.mockrandom;
/*
* 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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.apache.lucene.codecs.BlockTreeTermsReader;
import org.apache.lucene.codecs.BlockTreeTermsWriter;
import org.apache.lucene.codecs.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.PostingsReaderBase;
import org.apache.lucene.codecs.PostingsWriterBase;
import org.apache.lucene.codecs.TermStats;
import org.apache.lucene.codecs.blockterms.BlockTermsReader;
import org.apache.lucene.codecs.blockterms.BlockTermsWriter;
import org.apache.lucene.codecs.blockterms.FixedGapTermsIndexReader;
import org.apache.lucene.codecs.blockterms.FixedGapTermsIndexWriter;
import org.apache.lucene.codecs.blockterms.TermsIndexReaderBase;
import org.apache.lucene.codecs.blockterms.TermsIndexWriterBase;
import org.apache.lucene.codecs.blockterms.VariableGapTermsIndexReader;
import org.apache.lucene.codecs.blockterms.VariableGapTermsIndexWriter;
import org.apache.lucene.codecs.lucene40.Lucene40PostingsReader;
import org.apache.lucene.codecs.lucene40.Lucene40PostingsWriter;
import org.apache.lucene.codecs.mockintblock.MockFixedIntBlockPostingsFormat;
import org.apache.lucene.codecs.mockintblock.MockVariableIntBlockPostingsFormat;
import org.apache.lucene.codecs.mocksep.MockSingleIntFactory;
import org.apache.lucene.codecs.pulsing.PulsingPostingsReader;
import org.apache.lucene.codecs.pulsing.PulsingPostingsWriter;
import org.apache.lucene.codecs.sep.IntIndexInput;
import org.apache.lucene.codecs.sep.IntIndexOutput;
import org.apache.lucene.codecs.sep.IntStreamFactory;
import org.apache.lucene.codecs.sep.SepPostingsReader;
import org.apache.lucene.codecs.sep.SepPostingsWriter;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
/**
* Randomly combines terms index impl w/ postings impls.
*/
public final class MockRandomPostingsFormat extends PostingsFormat {
private final Random seedRandom;
private final String SEED_EXT = "sd";
public MockRandomPostingsFormat() {
// This ctor should *only* be used at read-time: get NPE if you use it!
this(null);
}
public MockRandomPostingsFormat(Random random) {
super("MockRandom");
if (random == null) {
this.seedRandom = new Random(0L) {
@Override
protected int next(int arg0) {
throw new IllegalStateException("Please use MockRandomPostingsFormat(Random)");
}
};
} else {
this.seedRandom = new Random(random.nextLong());
}
}
// Chooses random IntStreamFactory depending on file's extension
private static class MockIntStreamFactory extends IntStreamFactory {
private final int salt;
private final List<IntStreamFactory> delegates = new ArrayList<IntStreamFactory>();
public MockIntStreamFactory(Random random) {
salt = random.nextInt();
delegates.add(new MockSingleIntFactory());
final int blockSize = _TestUtil.nextInt(random, 1, 2000);
delegates.add(new MockFixedIntBlockPostingsFormat.MockIntFactory(blockSize));
final int baseBlockSize = _TestUtil.nextInt(random, 1, 127);
delegates.add(new MockVariableIntBlockPostingsFormat.MockIntFactory(baseBlockSize));
// TODO: others
}
private static String getExtension(String fileName) {
final int idx = fileName.indexOf('.');
assert idx != -1;
return fileName.substring(idx);
}
@Override
public IntIndexInput openInput(Directory dir, String fileName, IOContext context) throws IOException {
// Must only use extension, because IW.addIndexes can
// rename segment!
final IntStreamFactory f = delegates.get((Math.abs(salt ^ getExtension(fileName).hashCode())) % delegates.size());
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: read using int factory " + f + " from fileName=" + fileName);
}
return f.openInput(dir, fileName, context);
}
@Override
public IntIndexOutput createOutput(Directory dir, String fileName, IOContext context) throws IOException {
final IntStreamFactory f = delegates.get((Math.abs(salt ^ getExtension(fileName).hashCode())) % delegates.size());
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: write using int factory " + f + " to fileName=" + fileName);
}
return f.createOutput(dir, fileName, context);
}
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
// we pull this before the seed intentionally: because its not consumed at runtime
// (the skipInterval is written into postings header)
int skipInterval = _TestUtil.nextInt(seedRandom, 2, 10);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: skipInterval=" + skipInterval);
}
final long seed = seedRandom.nextLong();
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: writing to seg=" + state.segmentInfo.name + " formatID=" + state.segmentSuffix + " seed=" + seed);
}
final String seedFileName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, SEED_EXT);
final IndexOutput out = state.directory.createOutput(seedFileName, state.context);
try {
out.writeLong(seed);
} finally {
out.close();
}
final Random random = new Random(seed);
random.nextInt(); // consume a random for buffersize
PostingsWriterBase postingsWriter;
if (random.nextBoolean()) {
postingsWriter = new SepPostingsWriter(state, new MockIntStreamFactory(random), skipInterval);
} else {
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: writing Standard postings");
}
postingsWriter = new Lucene40PostingsWriter(state, skipInterval);
}
if (random.nextBoolean()) {
final int totTFCutoff = _TestUtil.nextInt(random, 1, 20);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: writing pulsing postings with totTFCutoff=" + totTFCutoff);
}
postingsWriter = new PulsingPostingsWriter(totTFCutoff, postingsWriter);
}
final FieldsConsumer fields;
if (random.nextBoolean()) {
// Use BlockTree terms dict
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: writing BlockTree terms dict");
}
// TODO: would be nice to allow 1 but this is very
// slow to write
final int minTermsInBlock = _TestUtil.nextInt(random, 2, 100);
final int maxTermsInBlock = Math.max(2, (minTermsInBlock-1)*2 + random.nextInt(100));
boolean success = false;
try {
fields = new BlockTreeTermsWriter(state, postingsWriter, minTermsInBlock, maxTermsInBlock);
success = true;
} finally {
if (!success) {
postingsWriter.close();
}
}
} else {
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: writing Block terms dict");
}
boolean success = false;
final TermsIndexWriterBase indexWriter;
try {
if (random.nextBoolean()) {
state.termIndexInterval = _TestUtil.nextInt(random, 1, 100);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: fixed-gap terms index (tii=" + state.termIndexInterval + ")");
}
indexWriter = new FixedGapTermsIndexWriter(state);
} else {
final VariableGapTermsIndexWriter.IndexTermSelector selector;
final int n2 = random.nextInt(3);
if (n2 == 0) {
final int tii = _TestUtil.nextInt(random, 1, 100);
selector = new VariableGapTermsIndexWriter.EveryNTermSelector(tii);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: variable-gap terms index (tii=" + tii + ")");
}
} else if (n2 == 1) {
final int docFreqThresh = _TestUtil.nextInt(random, 2, 100);
final int tii = _TestUtil.nextInt(random, 1, 100);
selector = new VariableGapTermsIndexWriter.EveryNOrDocFreqTermSelector(docFreqThresh, tii);
} else {
final long seed2 = random.nextLong();
final int gap = _TestUtil.nextInt(random, 2, 40);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: random-gap terms index (max gap=" + gap + ")");
}
selector = new VariableGapTermsIndexWriter.IndexTermSelector() {
final Random rand = new Random(seed2);
@Override
public boolean isIndexTerm(BytesRef term, TermStats stats) {
return rand.nextInt(gap) == gap/2;
}
@Override
public void newField(FieldInfo fieldInfo) {
}
};
}
indexWriter = new VariableGapTermsIndexWriter(state, selector);
}
success = true;
} finally {
if (!success) {
postingsWriter.close();
}
}
success = false;
try {
fields = new BlockTermsWriter(indexWriter, state, postingsWriter);
success = true;
} finally {
if (!success) {
try {
postingsWriter.close();
} finally {
indexWriter.close();
}
}
}
}
return fields;
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
final String seedFileName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, SEED_EXT);
final IndexInput in = state.dir.openInput(seedFileName, state.context);
final long seed = in.readLong();
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading from seg=" + state.segmentInfo.name + " formatID=" + state.segmentSuffix + " seed=" + seed);
}
in.close();
final Random random = new Random(seed);
int readBufferSize = _TestUtil.nextInt(random, 1, 4096);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: readBufferSize=" + readBufferSize);
}
PostingsReaderBase postingsReader;
if (random.nextBoolean()) {
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading Sep postings");
}
postingsReader = new SepPostingsReader(state.dir, state.fieldInfos, state.segmentInfo,
state.context, new MockIntStreamFactory(random), state.segmentSuffix);
} else {
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading Standard postings");
}
postingsReader = new Lucene40PostingsReader(state.dir, state.fieldInfos, state.segmentInfo, state.context, state.segmentSuffix);
}
if (random.nextBoolean()) {
final int totTFCutoff = _TestUtil.nextInt(random, 1, 20);
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading pulsing postings with totTFCutoff=" + totTFCutoff);
}
postingsReader = new PulsingPostingsReader(postingsReader);
}
final FieldsProducer fields;
if (random.nextBoolean()) {
// Use BlockTree terms dict
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading BlockTree terms dict");
}
boolean success = false;
try {
fields = new BlockTreeTermsReader(state.dir,
state.fieldInfos,
state.segmentInfo,
postingsReader,
state.context,
state.segmentSuffix,
state.termsIndexDivisor);
success = true;
} finally {
if (!success) {
postingsReader.close();
}
}
} else {
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: reading Block terms dict");
}
final TermsIndexReaderBase indexReader;
boolean success = false;
try {
final boolean doFixedGap = random.nextBoolean();
// randomness diverges from writer, here:
if (state.termsIndexDivisor != -1) {
state.termsIndexDivisor = _TestUtil.nextInt(random, 1, 10);
}
if (doFixedGap) {
// if termsIndexDivisor is set to -1, we should not touch it. It means a
// test explicitly instructed not to load the terms index.
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: fixed-gap terms index (divisor=" + state.termsIndexDivisor + ")");
}
indexReader = new FixedGapTermsIndexReader(state.dir,
state.fieldInfos,
state.segmentInfo.name,
state.termsIndexDivisor,
BytesRef.getUTF8SortedAsUnicodeComparator(),
state.segmentSuffix, state.context);
} else {
final int n2 = random.nextInt(3);
if (n2 == 1) {
random.nextInt();
} else if (n2 == 2) {
random.nextLong();
}
if (LuceneTestCase.VERBOSE) {
System.out.println("MockRandomCodec: variable-gap terms index (divisor=" + state.termsIndexDivisor + ")");
}
indexReader = new VariableGapTermsIndexReader(state.dir,
state.fieldInfos,
state.segmentInfo.name,
state.termsIndexDivisor,
state.segmentSuffix, state.context);
}
success = true;
} finally {
if (!success) {
postingsReader.close();
}
}
final int termsCacheSize = _TestUtil.nextInt(random, 1, 1024);
success = false;
try {
fields = new BlockTermsReader(indexReader,
state.dir,
state.fieldInfos,
state.segmentInfo,
postingsReader,
state.context,
termsCacheSize,
state.segmentSuffix);
success = true;
} finally {
if (!success) {
try {
postingsReader.close();
} finally {
indexReader.close();
}
}
}
}
return fields;
}
}