Examples of org.apache.lucene.facet.taxonomy.TaxonomyWriter

Package org.apache.lucene.facet.taxonomy

Examples of org.apache.lucene.facet.taxonomy.TaxonomyWriter

org.apache.lucene.facet.taxonomy.TaxonomyWriter
TaxonomyWriter is the interface which the faceted-search library uses to dynamically build the taxonomy at indexing time.
Notes about concurrent access to the taxonomy:
An implementation must allow multiple readers and a single writer to be active concurrently. Readers follow so-called "point in time" semantics, i.e., a reader object will only see taxonomy entries which were available at the time it was created. What the writer writes is only available to (new) readers after the writer's commit() is called.
Faceted search keeps two indices - namely Lucene's main index, and this taxonomy index. When one or more readers are active concurrently with the writer, care must be taken to avoid an inconsistency between the state of these two indices: When writing to the indices, the taxonomy must always be committed to disk *before* the main index, because the main index refers to categories listed in the taxonomy. Such control can best be achieved by turning off the main index's "autocommit" feature, and explicitly calling commit() for both indices (first for the taxonomy, then for the main index). In old versions of Lucene (2.2 or earlier), when autocommit could not be turned off, a more complicated solution needs to be used. E.g., use some sort of (possibly inter-process) locking to ensure that a reader is being opened only right after both indices have been flushed (and before anything else is written to them). @lucene.experimental

  @Test
  public void testReset() 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);
    Document doc = new Document();
    facetFields.addFields(doc, Arrays.asList(new CategoryPath("a/1", '/'), new CategoryPath("b/1", '/')));
    iw.addDocument(doc);
    taxonomyWriter.close();
    iw.close();
    
    DirectoryReader r = DirectoryReader.open(indexDir);
    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);

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  public void testParentOrdinal() throws Exception {
    // LUCENE-4913: root ordinal was always 0 when all children were requested
    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);
    Document doc = new Document();
    facetFields.addFields(doc, Arrays.asList(new CategoryPath("a/1", '/')));
    iw.addDocument(doc);
    taxonomyWriter.close();
    iw.close();
    
    DirectoryReader r = DirectoryReader.open(indexDir);
    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);

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  public void testNumValidDescendants() throws Exception {
    // LUCENE-4885: FacetResult.numValidDescendants was not set properly by FacetsAccumulator
    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 = 0; i < 10; i++) {
      Document doc = new Document();
      facetFields.addFields(doc, Arrays.asList(new CategoryPath("a", Integer.toString(i))));
      iw.addDocument(doc);
    }
    
    taxonomyWriter.close();
    iw.close();
    
    DirectoryReader r = DirectoryReader.open(indexDir);
    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);

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    // create and open an index writer
    RandomIndexWriter iw = new RandomIndexWriter(random(), indexDir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false)));
    // create and open a taxonomy writer
    TaxonomyWriter tw = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);


    PerDimensionIndexingParams iParams = new PerDimensionIndexingParams(Collections.<CategoryPath, CategoryListParams>emptyMap());


    seedIndex(iw, tw, iParams);


    IndexReader ir = iw.getReader();
    tw.commit();


    // prepare index reader and taxonomy.
    TaxonomyReader tr = new DirectoryTaxonomyReader(taxoDir);


    // prepare searcher to search against

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    // create and open an index writer
    RandomIndexWriter iw = new RandomIndexWriter(random(), indexDir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false)));
    // create and open a taxonomy writer
    TaxonomyWriter tw = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);


    PerDimensionIndexingParams iParams = new PerDimensionIndexingParams(
        Collections.singletonMap(new CategoryPath("Author"), new CategoryListParams("$author")));
    seedIndex(iw, tw, iParams);


    IndexReader ir = iw.getReader();
    tw.commit();


    // prepare index reader and taxonomy.
    TaxonomyReader tr = new DirectoryTaxonomyReader(taxoDir);


    // prepare searcher to search against

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    // create and open an index writer
    RandomIndexWriter iw = new RandomIndexWriter(random(), indexDir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false)));
    // create and open a taxonomy writer
    TaxonomyWriter tw = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);


    Map<CategoryPath,CategoryListParams> paramsMap = new HashMap<CategoryPath,CategoryListParams>();
    paramsMap.put(new CategoryPath("Band"), new CategoryListParams("$music"));
    paramsMap.put(new CategoryPath("Composer"), new CategoryListParams("$music"));
    PerDimensionIndexingParams iParams = new PerDimensionIndexingParams(paramsMap);
    seedIndex(iw, tw, iParams);


    IndexReader ir = iw.getReader();
    tw.commit();


    // prepare index reader and taxonomy.
    TaxonomyReader tr = new DirectoryTaxonomyReader(taxoDir);


    // prepare searcher to search against

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    // create and open an index writer
    RandomIndexWriter iw = new RandomIndexWriter(random(), indexDir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false)));
    // create and open a taxonomy writer
    TaxonomyWriter tw = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);


    Map<CategoryPath,CategoryListParams> paramsMap = new HashMap<CategoryPath,CategoryListParams>();
    paramsMap.put(new CategoryPath("Band"), new CategoryListParams("$bands"));
    paramsMap.put(new CategoryPath("Composer"), new CategoryListParams("$composers"));
    PerDimensionIndexingParams iParams = new PerDimensionIndexingParams(paramsMap);
    seedIndex(iw, tw, iParams);


    IndexReader ir = iw.getReader();
    tw.commit();


    // prepare index reader and taxonomy.
    TaxonomyReader tr = new DirectoryTaxonomyReader(taxoDir);


    // prepare searcher to search against

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    // create and open an index writer
    RandomIndexWriter iw = new RandomIndexWriter(random(), indexDir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random(), MockTokenizer.WHITESPACE, false)));
    // create and open a taxonomy writer
    TaxonomyWriter tw = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);


    Map<CategoryPath,CategoryListParams> paramsMap = new HashMap<CategoryPath,CategoryListParams>();
    paramsMap.put(new CategoryPath("Band"), new CategoryListParams("$music"));
    paramsMap.put(new CategoryPath("Composer"), new CategoryListParams("$music"));
    paramsMap.put(new CategoryPath("Author"), new CategoryListParams("$literature"));
    PerDimensionIndexingParams iParams = new PerDimensionIndexingParams(paramsMap);


    seedIndex(iw, tw, iParams);


    IndexReader ir = iw.getReader();
    tw.commit();


    // prepare index reader and taxonomy.
    TaxonomyReader tr = new DirectoryTaxonomyReader(taxoDir);


    // prepare searcher to search against

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  @Test
  public void testNoScore() 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 = 0; i < 4; i++) {
      Document doc = new Document();
      doc.add(new NumericDocValuesField("price", (i+1)));
      facetFields.addFields(doc, Collections.singletonList(new CategoryPath("a", Integer.toString(i % 2))));
      iw.addDocument(doc);
    }
    
    taxonomyWriter.close();
    iw.close();
    
    DirectoryReader r = DirectoryReader.open(indexDir);
    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);

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  @Test
  public void testWithScore() 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 = 0; i < 4; i++) {
      Document doc = new Document();
      doc.add(new NumericDocValuesField("price", (i+1)));
      facetFields.addFields(doc, Collections.singletonList(new CategoryPath("a", Integer.toString(i % 2))));
      iw.addDocument(doc);
    }
    
    taxonomyWriter.close();
    iw.close();
    
    DirectoryReader r = DirectoryReader.open(indexDir);
    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);

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