Examples of org.apache.lucene.search.Filter

org.apache.lucene.search.Filter
Abstract base class providing a mechanism to use a subset of an index for restriction or permission of index search results.
Note: In Lucene 3.0 {@link #bits(IndexReader)} will be removedand {@link #getDocIdSet(IndexReader)} will be defined as abstract.All implementing classes must therefore implement {@link #getDocIdSet(IndexReader)}in order to work with Lucene 3.0.

    }


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


    if (truncateGroups && nrOfCommands > 0) {
      docSet = computeGroupedDocSet(query, luceneFilter, collectors);
    } else if (needDocset) {

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  }


  public Filter getTopFilter() {
    final OpenBitSet bs = getBits();


    return new Filter() {
      @Override
      public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
        int offset = 0;
        SolrIndexReader r = (SolrIndexReader)reader;
        while (r.getParent() != null) {

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    return low;
  }


  @Override
  public Filter getTopFilter() {
    return new Filter() {
      int lastEndIdx = 0;


      @Override
      public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
        int offset = 0;

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  private void buildFilters() {
    ChainedFilter chainedFilter = null;
    if ( !filterDefinitions.isEmpty() ) {
      chainedFilter = new ChainedFilter();
      for ( FullTextFilterImpl fullTextFilter : filterDefinitions.values() ) {
        Filter filter = buildLuceneFilter( fullTextFilter );
        if ( filter != null ) {
          chainedFilter.addFilter( filter );
        }
      }
    }

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    Object instance = createFilterInstance( fullTextFilter, def );
    FilterKey key = createFilterKey( def, instance );


    // try to get the filter out of the cache
    Filter filter = cacheInstance( def.getCacheMode() ) ?
        searchFactoryImplementor.getFilterCachingStrategy().getCachedFilter( key ) :
        null;


    if ( filter == null ) {
      filter = createFilter( def, instance );

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  private boolean isPreQueryFilterOnly(FilterDef def) {
    return def.getImpl().equals( ShardSensitiveOnlyFilter.class );
  }


  private Filter createFilter(FilterDef def, Object instance) {
    Filter filter;
    if ( def.getFactoryMethod() != null ) {
      try {
        filter = ( Filter ) def.getFactoryMethod().invoke( instance );
      }
      catch ( IllegalAccessException e ) {

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  public static Filter parseFilter(String table, String filterStr, boolean superQueryOn, FieldManager fieldManager, BlurFilterCache filterCache, TableContext tableContext) throws ParseException, BlurException {
    if (filterStr == null) {
      return null;
    }
    synchronized (filterCache) {
      Filter filter;
      if (superQueryOn) {
        filter = filterCache.fetchPostFilter(table, filterStr);
      } else {
        filter = filterCache.fetchPreFilter(table, filterStr);
      }

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      CacheQuery cacheQuery = Search.getSearchManager(cache).getQuery(luceneQuery);
      List<Object> found = cacheQuery.list();


      assert found.size() == 2;


      Filter filter = new PrefixFilter(new Term("blurb", "cheese"));


      cacheQuery.filter(filter);


      found = cacheQuery.list();

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      return; // there is nothing to do if we don't have any filter definitions
    }


    ChainedFilter chainedFilter = new ChainedFilter();
    for (FullTextFilterImpl fullTextFilter : filterDefinitions.values()) {
      Filter filter = buildLuceneFilter(fullTextFilter);
      chainedFilter.addFilter( filter );
    }


    if ( filter != null ) chainedFilter.addFilter( filter );
    filter = chainedFilter;

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    FilterDef def = searchFactoryImplementor.getFilterDefinition( fullTextFilter.getName() );
    Object instance = createFilterInstance(fullTextFilter, def);
    FilterKey key = createFilterKey(def, instance);


    // try to get the filter out of the cache
    Filter filter = cacheInstance( def.getCacheMode() ) ?
        searchFactoryImplementor.getFilterCachingStrategy().getCachedFilter( key ) :
        null;


    if ( filter == null ) {
      filter = createFilter(def, instance);

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