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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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package com.browseengine.bobo.facets.impl;

import com.browseengine.bobo.api.BrowseSelection;
import com.browseengine.bobo.api.FacetSpec;
import com.browseengine.bobo.facets.data.FacetDataCache;
import com.browseengine.bobo.facets.data.MultiValueFacetDataCache;
import com.browseengine.bobo.util.BigIntArray;
import com.browseengine.bobo.util.BigNestedIntArray;

public class MultiValuedPathFacetCountCollector extends PathFacetCountCollector {

  private final BigNestedIntArray _array;

  public MultiValuedPathFacetCountCollector(String name, String sep, BrowseSelection sel,
      FacetSpec ospec, FacetDataCache dataCache) {
    super(name, sep, sel, ospec, dataCache);
    _array = ((MultiValueFacetDataCache) (dataCache))._nestedArray;
  }

  @Override
  public final void collect(int docid) {
    _array.countNoReturn(docid, _count);
  }

  @Override
  public final void collectAll() {
    _count = BigIntArray.fromArray(_dataCache.freqs);
  }
}