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Apache Lucene (module: benchmark)

There is a newer version: 9.11.1

package org.apache.lucene.benchmark.byTask.feeds;

/*
 * 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.Random;

import org.apache.lucene.benchmark.byTask.utils.Config;
import org.apache.lucene.facet.index.CategoryContainer;
import org.apache.lucene.facet.taxonomy.CategoryPath;

/**
 * Simple implementation of a random facet source
 * 
 * Supports the following parameters:
 * 

 * rand.seed - defines the seed to initialize Random with (default: 13).
 * 
max.doc.facets - maximal #facets per doc (default: 10).
 *    Actual number of facets in a certain doc would be anything between 1 and that number.
 * 
max.facet.depth - maximal #components in a facet (default: 3).
 *    Actual number of components in a certain facet would be anything between 1 and that number.
 * 
 */
public class RandomFacetSource extends FacetSource {

  Random random;
  
  private int maxDocFacets = 10;
  private int maxFacetDepth = 3;
  private int maxValue = maxDocFacets * maxFacetDepth;
  
  @Override
  public CategoryContainer getNextFacets(CategoryContainer facets) throws NoMoreDataException, IOException {
    if (facets == null) {
      facets = new CategoryContainer();
    } else {
      facets.clear();
    }
    int numFacets = 1 + random.nextInt(maxDocFacets-1); // at least one facet to each doc
    for (int i=0; i