package org.apache.lucene.codecs.bloom;
/**
* 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 org.apache.lucene.codecs.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.lucene41.Lucene41PostingsFormat;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
/**
* A class used for testing {@link BloomFilteringPostingsFormat} with a concrete
* delegate (Lucene41). Creates a Bloom filter on ALL fields and with tiny
* amounts of memory reserved for the filter. DO NOT USE IN A PRODUCTION
* APPLICATION This is not a realistic application of Bloom Filters as they
* ordinarily are larger and operate on only primary key type fields.
*/
public final class TestBloomFilteredLucene41Postings extends PostingsFormat {
private BloomFilteringPostingsFormat delegate;
// Special class used to avoid OOM exceptions where Junit tests create many
// fields.
static class LowMemoryBloomFactory extends BloomFilterFactory {
@Override
public FuzzySet getSetForField(SegmentWriteState state,FieldInfo info) {
return FuzzySet.createSetBasedOnMaxMemory(1024);
}
@Override
public boolean isSaturated(FuzzySet bloomFilter, FieldInfo fieldInfo) {
// For test purposes always maintain the BloomFilter - even past the point
// of usefulness when all bits are set
return false;
}
}
public TestBloomFilteredLucene41Postings() {
super("TestBloomFilteredLucene41Postings");
delegate = new BloomFilteringPostingsFormat(new Lucene41PostingsFormat(),
new LowMemoryBloomFactory());
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state)
throws IOException {
return delegate.fieldsConsumer(state);
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state)
throws IOException {
return delegate.fieldsProducer(state);
}
}