import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public void execute() throws IOException {
  final int nrOfCommands = commands.size();
  List<Collector> collectors = new ArrayList<>(nrOfCommands);
  for (Command command : commands) {
    collectors.addAll(command.create());
  }

  ProcessedFilter filter = searcher.getProcessedFilter
    (queryCommand.getFilter(), queryCommand.getFilterList());
  Query query = QueryUtils.makeQueryable(queryCommand.getQuery());

  if (truncateGroups) {
    docSet = computeGroupedDocSet(query, filter, collectors);
  } else if (needDocset) {
    docSet = computeDocSet(query, filter, collectors);
  } else if (!collectors.isEmpty()) {
    searchWithTimeLimiter(query, filter, MultiCollector.wrap(collectors.toArray(new Collector[nrOfCommands])));
  } else {
    searchWithTimeLimiter(query, filter, null);
  }
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
private FacetsCollector performSearch(FacetIndexingParams iParams, TaxonomyReader tr, IndexReader ir, 
    IndexSearcher searcher) throws IOException {
  // step 1: collect matching documents into a collector
  Query q = new MatchAllDocsQuery();
  TopScoreDocCollector topDocsCollector = TopScoreDocCollector.create(10, true);

  List<FacetRequest> facetRequests = new ArrayList<FacetRequest>();
  facetRequests.add(new CountFacetRequest(new CategoryPath("Band"), 10));
  CountFacetRequest bandDepth = new CountFacetRequest(new CategoryPath("Band"), 10);
  bandDepth.setDepth(2);
  // makes it easier to check the results in the test.
  bandDepth.setResultMode(ResultMode.GLOBAL_FLAT);
  facetRequests.add(bandDepth);
  facetRequests.add(new CountFacetRequest(new CategoryPath("Author"), 10));
  facetRequests.add(new CountFacetRequest(new CategoryPath("Band", "Rock & Pop"), 10));

  // Faceted search parameters indicate which facets are we interested in
  FacetSearchParams facetSearchParams = new FacetSearchParams(iParams, facetRequests);

  // perform documents search and facets accumulation
  FacetsCollector facetsCollector = FacetsCollector.create(facetSearchParams, ir, tr);
  searcher.search(q, MultiCollector.wrap(topDocsCollector, facetsCollector));
  return facetsCollector;
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
private void verifyDrillDown(Map<String,Integer> expectedCounts, FacetIndexingParams fip, DirectoryReader indexReader, 
    TaxonomyReader taxoReader, IndexSearcher searcher) throws IOException {
  // verify drill-down
  for (String dim : expectedCounts.keySet()) {
    CategoryPath drillDownCP = new CategoryPath(dim);
    FacetSearchParams fsp = new FacetSearchParams(fip, new CountFacetRequest(drillDownCP, 10));
    DrillDownQuery drillDown = new DrillDownQuery(fip, new MatchAllDocsQuery());
    drillDown.add(drillDownCP);
    TotalHitCountCollector total = new TotalHitCountCollector();
    FacetsCollector fc = FacetsCollector.create(fsp, indexReader, taxoReader);
    searcher.search(drillDown, MultiCollector.wrap(fc, total));
    assertTrue("no results for drill-down query " + drillDown, total.getTotalHits() > 0);
    List<FacetResult> facetResults = fc.getFacetResults();
    assertEquals(1, facetResults.size());
    FacetResultNode rootNode = facetResults.get(0).getFacetResultNode();
    assertEquals("wrong count for " + dim, expectedCounts.get(dim).intValue(), (int) rootNode.value);
  }
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public void execute() throws IOException {
  final int nrOfCommands = commands.size();
  List<Collector> collectors = new ArrayList<Collector>(nrOfCommands);
  for (Command command : commands) {
    collectors.addAll(command.create());
  }

  ProcessedFilter filter = searcher.getProcessedFilter
    (queryCommand.getFilter(), queryCommand.getFilterList());
  Query query = QueryUtils.makeQueryable(queryCommand.getQuery());

  if (truncateGroups) {
    docSet = computeGroupedDocSet(query, filter, collectors);
  } else if (needDocset) {
    docSet = computeDocSet(query, filter, collectors);
  } else if (!collectors.isEmpty()) {
    searchWithTimeLimiter(query, filter, MultiCollector.wrap(collectors.toArray(new Collector[nrOfCommands])));
  } else {
    searchWithTimeLimiter(query, filter, null);
  }
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
private DocSet computeGroupedDocSet(Query query, ProcessedFilter filter, List<Collector> collectors) throws IOException {
  Command firstCommand = commands.get(0);
  AbstractAllGroupHeadsCollector termAllGroupHeadsCollector =
      TermAllGroupHeadsCollector.create(firstCommand.getKey(), firstCommand.getSortWithinGroup());
  if (collectors.isEmpty()) {
    searchWithTimeLimiter(query, filter, termAllGroupHeadsCollector);
  } else {
    collectors.add(termAllGroupHeadsCollector);
    searchWithTimeLimiter(query, filter, MultiCollector.wrap(collectors.toArray(new Collector[collectors.size()])));
  }

  return new BitDocSet(termAllGroupHeadsCollector.retrieveGroupHeads(searcher.maxDoc()));
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
private DocSet computeDocSet(Query query, ProcessedFilter filter, List<Collector> collectors) throws IOException {
  int maxDoc = searcher.maxDoc();
  DocSetCollector docSetCollector;
  if (collectors.isEmpty()) {
    docSetCollector = new DocSetCollector(maxDoc >> 6, maxDoc);
  } else {
    Collector wrappedCollectors = MultiCollector.wrap(collectors.toArray(new Collector[collectors.size()]));
    docSetCollector = new DocSetDelegateCollector(maxDoc >> 6, maxDoc, wrappedCollectors);
  }
  searchWithTimeLimiter(query, filter, docSetCollector);
  return docSetCollector.getDocSet();
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@Test
public void testSumScoreAggregator() throws Exception {
  Directory indexDir = newDirectory();
  Directory taxoDir = newDirectory();

  TaxonomyWriter taxonomyWriter = new DirectoryTaxonomyWriter(taxoDir);
  IndexWriter iw = new IndexWriter(indexDir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())));

  FacetFields facetFields = new FacetFields(taxonomyWriter);
  for(int i = atLeast(30); i > 0; --i) {
    Document doc = new Document();
    doc.add(new StringField("f", "v", Store.NO));
    facetFields.addFields(doc, Collections.singletonList(new CategoryPath("a")));
    iw.addDocument(doc);
  }
  
  taxonomyWriter.close();
  iw.close();
  
  DirectoryReader r = DirectoryReader.open(indexDir);
  DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);
  
  FacetSearchParams sParams = new FacetSearchParams(new SumScoreFacetRequest(new CategoryPath("a"), 10));
  FacetsAccumulator fa = new FacetsAccumulator(sParams, r, taxo) {
    @Override
    public FacetsAggregator getAggregator() {
      return new SumScoreFacetsAggregator();
    }
  };
  FacetsCollector fc = FacetsCollector.create(fa);
  TopScoreDocCollector topDocs = TopScoreDocCollector.create(10, false);
  new IndexSearcher(r).search(new MatchAllDocsQuery(), MultiCollector.wrap(fc, topDocs));
  
  List<FacetResult> res = fc.getFacetResults();
  double value = res.get(0).getFacetResultNode().value;
  double expected = topDocs.topDocs().getMaxScore() * r.numDocs();
  assertEquals(expected, value, 1E-10);
  
  IOUtils.close(taxo, taxoDir, r, indexDir);
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
/** User runs a query and counts facets. */
private List<FacetResult> search() throws IOException {
	DirectoryReader indexReader = DirectoryReader.open(directory);
	IndexSearcher searcher = new IndexSearcher(indexReader);
	SortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(indexReader);
	
	// Aggregates the facet counts
	FacetsCollector fc = new FacetsCollector();
	
	// MatchAllDocsQuery is for "browsing" (counts facets
	// for all non-deleted docs in the index); normally
	// you'd use a "normal" query:
	//FacetsCollector.search(searcher, new MatchAllDocsQuery(), 10, fc);

	TotalHitCountCollector collector = new TotalHitCountCollector();
	searcher.search(new MatchAllDocsQuery(), MultiCollector.wrap(collector, fc));
	
	// Retrieve results
	Facets facets = new SortedSetDocValuesFacetCounts(state, fc);
	
	List<FacetResult> results = new ArrayList<>();
	results.add(facets.getTopChildren(10, "Author"));
	results.add(facets.getTopChildren(10, "Publish Year"));
	indexReader.close();
	
	return results;
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
/**
 * Provided a search has been created, this method will execute
 * that search and aggregate its results into the Search object's
 * collectors.  These collectors may be accessed using the
 * accessors of the Search object.
 * @throws IOException A fatal exception occurred while interacting
 * with the index.
 */
public void search() throws IOException {
   if (search != null) {
      final Collector collector = search.getCollector();
      final FacetsCollector facetsCollector = search.getFacetsCollector(indexReader, taxonomyReader);
      indexSearcher.search(
            search.getQuery(),
            MultiCollector.wrap(collector, facetsCollector)
      );
   }
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
/**
 * Test method for {@link com.fuerve.villageelder.actions.results.SearchResult#aggregate(com.fuerve.villageelder.actions.results.SearchResultItem)}.
 */
@Test
public final void testAggregateSearchResultItem() throws Exception {
   Directory indexDirectoryExpected = new RAMDirectory();
   Directory taxonomyDirectoryExpected = new RAMDirectory();
   
   buildDummyIndex(indexDirectoryExpected, taxonomyDirectoryExpected);
   
   IndexReader reader = DirectoryReader.open(indexDirectoryExpected);
   IndexSearcher searcher = new IndexSearcher(reader);
   TaxonomyReader taxo = new DirectoryTaxonomyReader(taxonomyDirectoryExpected);
   
   QueryParser parser =
         new SearchQueryParser(
               Lucene.LUCENE_VERSION,
               Lucene.DEFAULT_QUERY_FIELD,
               Lucene.getPerFieldAnalyzer()
         );
   
   TopFieldCollector indexCollector = getDummyCollector();
   FacetsCollector facetsCollector = getDummyFacetsCollector((DirectoryReader) reader, taxo);
   Collector collector = MultiCollector.wrap(indexCollector, facetsCollector);
   searcher.search(parser.parse("Revision:5*"), collector);
   facetsCollector.getFacetResults();
   
   SearchResult target = new SearchResult();
   target.aggregate(new SearchResultItem(indexCollector.topDocs(), facetsCollector.getFacetResults()));
   
   assertEquals(2, target.getTopDocs().totalHits);
   assertEquals(1, target.getFacetResults().size());
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
/**
 * Test method for {@link com.fuerve.villageelder.actions.results.SearchResultItem#SearchResultItem(org.apache.lucene.search.TopDocs, java.util.List)}.
 */
@Test
public final void testSearchResultItem() throws Exception {
   Directory indexDirectoryExpected = new RAMDirectory();
   Directory taxonomyDirectoryExpected = new RAMDirectory();
   
   buildDummyIndex(indexDirectoryExpected, taxonomyDirectoryExpected);
   
   IndexReader reader = DirectoryReader.open(indexDirectoryExpected);
   IndexSearcher searcher = new IndexSearcher(reader);
   TaxonomyReader taxo = new DirectoryTaxonomyReader(taxonomyDirectoryExpected);
   
   QueryParser parser =
         new SearchQueryParser(
               Lucene.LUCENE_VERSION,
               Lucene.DEFAULT_QUERY_FIELD,
               Lucene.getPerFieldAnalyzer()
         );
   
   TopFieldCollector indexCollector = getDummyCollector();
   FacetsCollector facetsCollector = getDummyFacetsCollector((DirectoryReader) reader, taxo);
   Collector collector = MultiCollector.wrap(indexCollector, facetsCollector);
   searcher.search(parser.parse("Revision:5*"), collector);
   facetsCollector.getFacetResults();
   SearchResultItem target = new SearchResultItem(indexCollector.topDocs(), facetsCollector.getFacetResults());
   
   assertEquals(2, target.getTopDocs().totalHits);
   assertEquals(1, target.getFacetResults().size());
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@Test
public void testSumScoreAggregator() throws Exception {
  Directory indexDir = newDirectory();
  Directory taxoDir = newDirectory();

  TaxonomyWriter taxonomyWriter = new DirectoryTaxonomyWriter(taxoDir);
  IndexWriter iw = new IndexWriter(indexDir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())));

  FacetFields facetFields = new FacetFields(taxonomyWriter);
  for(int i = atLeast(30); i > 0; --i) {
    Document doc = new Document();
    if (random().nextBoolean()) { // don't match all documents
      doc.add(new StringField("f", "v", Store.NO));
    }
    facetFields.addFields(doc, Collections.singletonList(new CategoryPath("a")));
    iw.addDocument(doc);
  }
  
  taxonomyWriter.close();
  iw.close();
  
  DirectoryReader r = DirectoryReader.open(indexDir);
  DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);
  
  FacetSearchParams fsp = new FacetSearchParams(new SumScoreFacetRequest(new CategoryPath("a"), 10));
  FacetsCollector fc = FacetsCollector.create(fsp, r, taxo);
  TopScoreDocCollector topDocs = TopScoreDocCollector.create(10, false);
  ConstantScoreQuery csq = new ConstantScoreQuery(new MatchAllDocsQuery());
  csq.setBoost(2.0f);
  
  newSearcher(r).search(csq, MultiCollector.wrap(fc, topDocs));
  
  List<FacetResult> res = fc.getFacetResults();
  float value = (float) res.get(0).getFacetResultNode().value;
  TopDocs td = topDocs.topDocs();
  int expected = (int) (td.getMaxScore() * td.totalHits);
  assertEquals(expected, (int) value);
  
  IOUtils.close(taxo, taxoDir, r, indexDir);
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
public void wrap(Collector collector) {
  wrappedCollector = MultiCollector.wrap(collector, wrappedCollector);
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@Test
public void testCountAndSumScore() throws Exception {
  Directory indexDir = newDirectory();
  Directory taxoDir = newDirectory();
  
  TaxonomyWriter taxonomyWriter = new DirectoryTaxonomyWriter(taxoDir);
  IndexWriter iw = new IndexWriter(indexDir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())));
  FacetIndexingParams fip = new PerDimensionIndexingParams(Collections.singletonMap(new CategoryPath("b"), new CategoryListParams("$b")));
  
  FacetFields facetFields = new FacetFields(taxonomyWriter, fip);
  for(int i = atLeast(30); i > 0; --i) {
    Document doc = new Document();
    doc.add(new StringField("f", "v", Store.NO));
    List<CategoryPath> cats = new ArrayList<CategoryPath>();
    cats.add(new CategoryPath("a"));
    cats.add(new CategoryPath("b"));
    facetFields.addFields(doc, cats);
    iw.addDocument(doc);
  }
  
  taxonomyWriter.close();
  iw.close();
  
  DirectoryReader r = DirectoryReader.open(indexDir);
  DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);
  
  FacetSearchParams sParams = new FacetSearchParams(fip,
      new CountFacetRequest(new CategoryPath("a"), 10), 
      new SumScoreFacetRequest(new CategoryPath("b"), 10));
  
  Map<CategoryListParams,FacetsAggregator> aggregators = new HashMap<CategoryListParams,FacetsAggregator>();
  aggregators.put(fip.getCategoryListParams(new CategoryPath("a")), new FastCountingFacetsAggregator());
  aggregators.put(fip.getCategoryListParams(new CategoryPath("b")), new SumScoreFacetsAggregator());
  final FacetsAggregator aggregator = new PerCategoryListAggregator(aggregators, fip);
  FacetsAccumulator fa = new FacetsAccumulator(sParams, r, taxo) {
    @Override
    public FacetsAggregator getAggregator() {
      return aggregator;
    }
  };
  
  FacetsCollector fc = FacetsCollector.create(fa);
  TopScoreDocCollector topDocs = TopScoreDocCollector.create(10, false);
  new IndexSearcher(r).search(new MatchAllDocsQuery(), MultiCollector.wrap(fc, topDocs));
  
  List<FacetResult> facetResults = fc.getFacetResults();
  FacetResult fresA = facetResults.get(0);
  assertEquals("unexpected count for " + fresA, r.maxDoc(), (int) fresA.getFacetResultNode().value);
  
  FacetResult fresB = facetResults.get(1);
  double expected = topDocs.topDocs().getMaxScore() * r.numDocs();
  assertEquals("unexpected value for " + fresB, expected, fresB.getFacetResultNode().value, 1E-10);
  
  IOUtils.close(taxo, taxoDir, r, indexDir);
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
/**
 * Test method for {@link com.fuerve.villageelder.search.Searcher#search(org.apache.lucene.search.Collector)}.
 */
@SuppressWarnings("unused")
@Test
public final void testSearchCollector() throws Exception {
   // Gather declared fields.
   Field indexDirectoryField = Searcher.class.getDeclaredField("indexDirectory");
   Field taxonomyDirectoryField = Searcher.class.getDeclaredField("taxonomyDirectory");
   Field indexDirectoryNameField = Searcher.class.getDeclaredField("indexDirectoryName");
   Field taxonomyDirectoryNameField = Searcher.class.getDeclaredField("taxonomyDirectoryName");
   Field stringDirectoriesField = Searcher.class.getDeclaredField("stringDirectories");
   Field initializedField = Searcher.class.getDeclaredField("initialized");
   Field searchField = Searcher.class.getDeclaredField("search");
   Field indexReaderField = Searcher.class.getDeclaredField("indexReader");
   Field indexSearcherField = Searcher.class.getDeclaredField("indexSearcher");
   Field taxonomyReaderField = Searcher.class.getDeclaredField("taxonomyReader");
   
   indexDirectoryField.setAccessible(true);
   taxonomyDirectoryField.setAccessible(true);
   indexDirectoryNameField.setAccessible(true);
   taxonomyDirectoryNameField.setAccessible(true);
   stringDirectoriesField.setAccessible(true);
   initializedField.setAccessible(true);
   searchField.setAccessible(true);
   indexReaderField.setAccessible(true);
   indexSearcherField.setAccessible(true);
   taxonomyReaderField.setAccessible(true);
   
   // Setup
   Directory indexDirectoryExpected = new RAMDirectory();
   Directory taxonomyDirectoryExpected = new RAMDirectory();
   
   buildDummyIndex(indexDirectoryExpected, taxonomyDirectoryExpected);
   
   Searcher target = new Searcher(indexDirectoryExpected, taxonomyDirectoryExpected);
   target.initializeSearch();
   
   // Gather field values.
   Directory indexDirectoryActual = (Directory) indexDirectoryField.get(target);
   Directory taxonomyDirectoryActual = (Directory) taxonomyDirectoryField.get(target);
   String indexDirectoryNameActual = (String) indexDirectoryNameField.get(target);
   String taxonomyDirectoryNameActual = (String) taxonomyDirectoryNameField.get(target);
   boolean stringDirectoriesActual = stringDirectoriesField.getBoolean(target);
   boolean initializedActual = initializedField.getBoolean(target);
   Search searchFieldActual = (Search) searchField.get(target);
   IndexReader indexReaderActual = (IndexReader) indexReaderField.get(target);
   IndexSearcher indexSearcherActual = (IndexSearcher) indexSearcherField.get(target);
   TaxonomyReader taxonomyReaderActual = (TaxonomyReader) taxonomyReaderField.get(target);
   
   // Create the Collector to be passed in and execute a search to populate it.
   final TopFieldCollector collector = getDummyCollector();
   final FacetsCollector facetsCollector =
         getDummyFacetsCollector((DirectoryReader) indexReaderActual, taxonomyReaderActual);
   final Collector testCollector = MultiCollector.wrap(collector, facetsCollector);
   
   target.createSearch("Revision:5*");
   target.search(testCollector);
   
   // Test
   assertEquals(true, initializedActual);
   assertEquals(2, collector.topDocs().totalHits);
}
 

import org.apache.lucene.search.MultiCollector; //导入依赖的package包/类
@Test
public void testCountAndSumScore() throws Exception {
  Directory indexDir = newDirectory();
  Directory taxoDir = newDirectory();
  
  TaxonomyWriter taxonomyWriter = new DirectoryTaxonomyWriter(taxoDir);
  IndexWriter iw = new IndexWriter(indexDir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random())));
  FacetIndexingParams fip = new PerDimensionIndexingParams(Collections.singletonMap(new CategoryPath("b"), new CategoryListParams("$b")));
  
  FacetFields facetFields = new FacetFields(taxonomyWriter, fip);
  for(int i = atLeast(30); i > 0; --i) {
    Document doc = new Document();
    doc.add(new StringField("f", "v", Store.NO));
    List<CategoryPath> cats = new ArrayList<CategoryPath>();
    cats.add(new CategoryPath("a"));
    cats.add(new CategoryPath("b"));
    facetFields.addFields(doc, cats);
    iw.addDocument(doc);
  }
  
  taxonomyWriter.close();
  iw.close();
  
  DirectoryReader r = DirectoryReader.open(indexDir);
  DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);
  
  FacetSearchParams sParams = new FacetSearchParams(fip,
      new CountFacetRequest(new CategoryPath("a"), 10), 
      new SumScoreFacetRequest(new CategoryPath("b"), 10));
  
  FacetsCollector fc = FacetsCollector.create(sParams, r, taxo);
  TopScoreDocCollector topDocs = TopScoreDocCollector.create(10, false);
  newSearcher(r).search(new MatchAllDocsQuery(), MultiCollector.wrap(fc, topDocs));
  
  List<FacetResult> facetResults = fc.getFacetResults();
  FacetResult fresA = facetResults.get(0);
  assertEquals("unexpected count for " + fresA, r.maxDoc(), (int) fresA.getFacetResultNode().value);
  
  FacetResult fresB = facetResults.get(1);
  double expected = topDocs.topDocs().getMaxScore() * r.numDocs();
  assertEquals("unexpected value for " + fresB, expected, fresB.getFacetResultNode().value, 1E-10);
  
  IOUtils.close(taxo, taxoDir, r, indexDir);
}