package org.apache.lucene.facet.complements;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.facet.old.Aggregator;
import org.apache.lucene.facet.old.CountingAggregator;
import org.apache.lucene.facet.old.OldFacetsAccumulator;
import org.apache.lucene.facet.old.ScoredDocIdsUtils;
import org.apache.lucene.facet.params.CategoryListParams;
import org.apache.lucene.facet.params.FacetIndexingParams;
import org.apache.lucene.facet.params.FacetSearchParams;
import org.apache.lucene.facet.search.CategoryListIterator;
import org.apache.lucene.facet.search.CountFacetRequest;
import org.apache.lucene.facet.search.FacetArrays;
import org.apache.lucene.facet.search.FacetRequest;
import org.apache.lucene.facet.taxonomy.CategoryPath;
import org.apache.lucene.facet.taxonomy.TaxonomyReader;
import org.apache.lucene.facet.util.PartitionsUtils;
import org.apache.lucene.index.IndexReader;
/*
* 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.
*/
/**
* Maintain Total Facet Counts per partition, for given parameters:
* <ul>
* <li>Index reader of an index</li>
* <li>Taxonomy index reader</li>
* <li>Facet indexing params (and particularly the category list params)</li>
* <li></li>
* </ul>
* The total facet counts are maintained as an array of arrays of integers,
* where a separate array is kept for each partition.
*
* @lucene.experimental
*/
public class TotalFacetCounts {
/** total facet counts per partition: totalCounts[partition][ordinal%partitionLength] */
private int[][] totalCounts = null;
private final TaxonomyReader taxonomy;
private final FacetIndexingParams facetIndexingParams;
private final static AtomicInteger atomicGen4Test = new AtomicInteger(1);
/** Creation type for test purposes */
enum CreationType { Computed, Loaded } // for testing
final int gen4test;
final CreationType createType4test;
/**
* Construct by key - from index Directory or by recomputing.
*/
private TotalFacetCounts (TaxonomyReader taxonomy, FacetIndexingParams facetIndexingParams,
int[][] counts, CreationType createType4Test) {
this.taxonomy = taxonomy;
this.facetIndexingParams = facetIndexingParams;
this.totalCounts = counts;
this.createType4test = createType4Test;
this.gen4test = atomicGen4Test.incrementAndGet();
}
/**
* Fill a partition's array with the TotalCountsArray values.
* @param partitionArray array to fill
* @param partition number of required partition
*/
public void fillTotalCountsForPartition(int[] partitionArray, int partition) {
int partitionSize = partitionArray.length;
int[] countArray = totalCounts[partition];
if (countArray == null) {
countArray = new int[partitionSize];
totalCounts[partition] = countArray;
}
int length = Math.min(partitionSize, countArray.length);
System.arraycopy(countArray, 0, partitionArray, 0, length);
}
/**
* Return the total count of an input category
* @param ordinal ordinal of category whose total count is required
*/
public int getTotalCount(int ordinal) {
int partition = PartitionsUtils.partitionNumber(facetIndexingParams,ordinal);
int offset = ordinal % PartitionsUtils.partitionSize(facetIndexingParams, taxonomy);
return totalCounts[partition][offset];
}
static TotalFacetCounts loadFromFile(File inputFile, TaxonomyReader taxonomy,
FacetIndexingParams facetIndexingParams) throws IOException {
DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(inputFile)));
try {
int[][] counts = new int[dis.readInt()][];
for (int i=0; i<counts.length; i++) {
int size = dis.readInt();
if (size<0) {
counts[i] = null;
} else {
counts[i] = new int[size];
for (int j=0; j<size; j++) {
counts[i][j] = dis.readInt();
}
}
}
return new TotalFacetCounts(taxonomy, facetIndexingParams, counts, CreationType.Loaded);
} finally {
dis.close();
}
}
static void storeToFile(File outputFile, TotalFacetCounts tfc) throws IOException {
DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(outputFile)));
try {
dos.writeInt(tfc.totalCounts.length);
for (int[] counts : tfc.totalCounts) {
if (counts == null) {
dos.writeInt(-1);
} else {
dos.writeInt(counts.length);
for (int i : counts) {
dos.writeInt(i);
}
}
}
} finally {
dos.close();
}
}
// needed because FacetSearchParams do not allow empty FacetRequests
private static final FacetRequest DUMMY_REQ = new CountFacetRequest(CategoryPath.EMPTY, 1);
static TotalFacetCounts compute(final IndexReader indexReader, final TaxonomyReader taxonomy,
final FacetIndexingParams facetIndexingParams) throws IOException {
int partitionSize = PartitionsUtils.partitionSize(facetIndexingParams, taxonomy);
final int[][] counts = new int[(int) Math.ceil(taxonomy.getSize() /(float) partitionSize)][partitionSize];
FacetSearchParams newSearchParams = new FacetSearchParams(facetIndexingParams, DUMMY_REQ);
//createAllListsSearchParams(facetIndexingParams, this.totalCounts);
OldFacetsAccumulator sfa = new OldFacetsAccumulator(newSearchParams, indexReader, taxonomy) {
@Override
protected HashMap<CategoryListIterator, Aggregator> getCategoryListMap(
FacetArrays facetArrays, int partition) throws IOException {
Aggregator aggregator = new CountingAggregator(counts[partition]);
HashMap<CategoryListIterator, Aggregator> map = new HashMap<CategoryListIterator, Aggregator>();
for (CategoryListParams clp: facetIndexingParams.getAllCategoryListParams()) {
map.put(clp.createCategoryListIterator(partition), aggregator);
}
return map;
}
};
sfa.setComplementThreshold(OldFacetsAccumulator.DISABLE_COMPLEMENT);
sfa.accumulate(ScoredDocIdsUtils.createAllDocsScoredDocIDs(indexReader));
return new TotalFacetCounts(taxonomy, facetIndexingParams, counts, CreationType.Computed);
}
}