package org.apache.lucene.index;
/*
* 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
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* 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.
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import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.asserting.AssertingPostingsFormat;
import org.apache.lucene.codecs.block.BlockPostingsFormat;
import org.apache.lucene.codecs.bloom.TestBloomFilteredLucene40Postings;
import org.apache.lucene.codecs.lucene40.Lucene40Codec;
import org.apache.lucene.codecs.lucene40.Lucene40PostingsFormat;
import org.apache.lucene.codecs.lucene40ords.Lucene40WithOrds;
import org.apache.lucene.codecs.memory.DirectPostingsFormat;
import org.apache.lucene.codecs.memory.MemoryPostingsFormat;
import org.apache.lucene.codecs.mockintblock.MockFixedIntBlockPostingsFormat;
import org.apache.lucene.codecs.mockintblock.MockVariableIntBlockPostingsFormat;
import org.apache.lucene.codecs.mockrandom.MockRandomPostingsFormat;
import org.apache.lucene.codecs.mocksep.MockSepPostingsFormat;
import org.apache.lucene.codecs.nestedpulsing.NestedPulsingPostingsFormat;
import org.apache.lucene.codecs.pulsing.Pulsing40PostingsFormat;
import org.apache.lucene.codecs.simpletext.SimpleTextPostingsFormat;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
/**
* Codec that assigns per-field random postings formats.
* <p>
* The same field/format assignment will happen regardless of order,
* a hash is computed up front that determines the mapping.
* This means fields can be put into things like HashSets and added to
* documents in different orders and the test will still be deterministic
* and reproducable.
*/
public class RandomCodec extends Lucene40Codec {
/** Shuffled list of postings formats to use for new mappings */
private List<PostingsFormat> formats = new ArrayList<PostingsFormat>();
/** unique set of format names this codec knows about */
public Set<String> formatNames = new HashSet<String>();
/** memorized field->postingsformat mappings */
// note: we have to sync this map even though its just for debugging/toString,
// otherwise DWPT's .toString() calls that iterate over the map can
// cause concurrentmodificationexception if indexwriter's infostream is on
private Map<String,PostingsFormat> previousMappings = Collections.synchronizedMap(new HashMap<String,PostingsFormat>());
private final int perFieldSeed;
@Override
public PostingsFormat getPostingsFormatForField(String name) {
PostingsFormat codec = previousMappings.get(name);
if (codec == null) {
codec = formats.get(Math.abs(perFieldSeed ^ name.hashCode()) % formats.size());
if (codec instanceof SimpleTextPostingsFormat && perFieldSeed % 5 != 0) {
// make simpletext rarer, choose again
codec = formats.get(Math.abs(perFieldSeed ^ name.toUpperCase(Locale.ROOT).hashCode()) % formats.size());
}
previousMappings.put(name, codec);
// Safety:
assert previousMappings.size() < 10000: "test went insane";
}
return codec;
}
public RandomCodec(Random random, Set<String> avoidCodecs) {
this.perFieldSeed = random.nextInt();
// TODO: make it possible to specify min/max iterms per
// block via CL:
int minItemsPerBlock = _TestUtil.nextInt(random, 2, 100);
int maxItemsPerBlock = 2*(Math.max(2, minItemsPerBlock-1)) + random.nextInt(100);
int lowFreqCutoff = _TestUtil.nextInt(random, 2, 100);
add(avoidCodecs,
new Lucene40PostingsFormat(minItemsPerBlock, maxItemsPerBlock),
new BlockPostingsFormat(minItemsPerBlock, maxItemsPerBlock),
new DirectPostingsFormat(LuceneTestCase.rarely(random) ? 1 : (LuceneTestCase.rarely(random) ? Integer.MAX_VALUE : maxItemsPerBlock),
LuceneTestCase.rarely(random) ? 1 : (LuceneTestCase.rarely(random) ? Integer.MAX_VALUE : lowFreqCutoff)),
new Pulsing40PostingsFormat(1 + random.nextInt(20), minItemsPerBlock, maxItemsPerBlock),
// add pulsing again with (usually) different parameters
new Pulsing40PostingsFormat(1 + random.nextInt(20), minItemsPerBlock, maxItemsPerBlock),
//TODO as a PostingsFormat which wraps others, we should allow TestBloomFilteredLucene40Postings to be constructed
//with a choice of concrete PostingsFormats. Maybe useful to have a generic means of marking and dealing
//with such "wrapper" classes?
new TestBloomFilteredLucene40Postings(),
new MockSepPostingsFormat(),
new MockFixedIntBlockPostingsFormat(_TestUtil.nextInt(random, 1, 2000)),
new MockVariableIntBlockPostingsFormat( _TestUtil.nextInt(random, 1, 127)),
new MockRandomPostingsFormat(random),
new NestedPulsingPostingsFormat(),
new Lucene40WithOrds(),
new SimpleTextPostingsFormat(),
new AssertingPostingsFormat(),
new MemoryPostingsFormat(true, random.nextFloat()),
new MemoryPostingsFormat(false, random.nextFloat()));
Collections.shuffle(formats, random);
// Avoid too many open files:
formats = formats.subList(0, 4);
}
public RandomCodec(Random random) {
this(random, Collections.<String> emptySet());
}
private final void add(Set<String> avoidCodecs, PostingsFormat... postings) {
for (PostingsFormat p : postings) {
if (!avoidCodecs.contains(p.getName())) {
formats.add(p);
formatNames.add(p.getName());
}
}
}
@Override
public String toString() {
return super.toString() + ": " + previousMappings.toString();
}
}