Examples of org.apache.lucene.facet.index.streaming.CategoryParentsStream

Package org.apache.lucene.facet.index.streaming

Examples of org.apache.lucene.facet.index.streaming.CategoryParentsStream

org.apache.lucene.facet.index.streaming.CategoryParentsStream
This class adds parents to a {@link CategoryAttributesStream}. The parents are added according to the {@link PathPolicy} and {@link OrdinalPolicy} fromthe {@link FacetIndexingParams} given in the constructor.
By default, category properties are removed when creating parents of a certain category. However, it is possible to retain certain property types using {@link #addRetainableProperty(Class)}. @lucene.experimental

    Directory directory = newDirectory();
    TaxonomyWriter taxonomyWriter = new DirectoryTaxonomyWriter(
        directory);


    FacetIndexingParams indexingParams = new DefaultFacetIndexingParams();
    new CategoryParentsStream(new CategoryAttributesStream(
        categoryContainer), taxonomyWriter, indexingParams);


    // add DummyAttribute and retain it, three expected
    categoryContainer.clear();
    categoryContainer
        .addCategory(initialCatgeories[0], new DummyProperty());
    CategoryParentsStream stream = new CategoryParentsStream(
        new CategoryAttributesStream(categoryContainer),
        taxonomyWriter, new DefaultFacetIndexingParams());
    stream.addRetainableProperty(DummyProperty.class);


    MyCategoryListTokenizer tokenizer = new MyCategoryListTokenizer(stream,
        indexingParams);


    int nAttributes = 0;

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      // Set a suitable {@link TokenStream} using
      // CategoryParentsStream, followed by CategoryListTokenizer and
      // CategoryTokenizer composition (the ordering of the last two is
      // not mandatory).
      CategoryParentsStream parentsStream = (CategoryParentsStream) getParentsStream(categoryAttributesStream);
      CategoryListTokenizer categoryListTokenizer = getCategoryListTokenizer(parentsStream);
      CategoryTokenizer stream = getCategoryTokenizer(categoryListTokenizer);


      // Finally creating a suitable field with stream and adding it to a
      // master field-list, used during the build process (see

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   * @see OrdinalPolicy OrdinalPolicy (for policy of adding category tokens for parents)
   * @see PathPolicy PathPolicy (for policy of adding category <b>list</b> tokens for parents)
   */
  protected TokenStream getParentsStream(
      CategoryAttributesStream categoryAttributesStream) {
    return new CategoryParentsStream(categoryAttributesStream,
        taxonomyWriter, indexingParams);
  }

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org.apache.lucene.facet.enhancements.EnhancementsDocumentBuilder

org.apache.lucene.facet.index.attributes.OrdinalProperty

org.apache.lucene.facet.index.CategoryDocumentBuilder

org.apache.lucene.facet.index.streaming.CategoryParentsStreamTest

org.apache.lucene.facet.taxonomy.CategoryPath

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