### Home Classes Methods

### In Files

- ext/r_search.c

### Parent

Object

### Methods

- #bits
- #to_s

### Files

- MIT-LICENSE
- README
- TODO
- TUTORIAL

### Class/Module Index

Quicksearch

- Ferret
- Ferret::Analysis
- Ferret::Analysis::Analyzer
- Ferret::Analysis::AsciiLetterAnalyzer
- Ferret::Analysis::AsciiLetterTokenizer
- Ferret::Analysis::AsciiLowerCaseFilter
- Ferret::Analysis::AsciiStandardAnalyzer
- Ferret::Analysis::AsciiStandardTokenizer
- Ferret::Analysis::AsciiWhiteSpaceAnalyzer
- Ferret::Analysis::AsciiWhiteSpaceTokenizer
- Ferret::Analysis::HyphenFilter
- Ferret::Analysis::LetterAnalyzer
- Ferret::Analysis::LetterTokenizer
- Ferret::Analysis::LowerCaseFilter
- Ferret::Analysis::MappingFilter
- Ferret::Analysis::PerFieldAnalyzer
- Ferret::Analysis::RegExpAnalyzer
- Ferret::Analysis::RegExpTokenizer
- Ferret::Analysis::StandardAnalyzer
- Ferret::Analysis::StandardTokenizer
- Ferret::Analysis::StemFilter
- Ferret::Analysis::StopFilter
- Ferret::Analysis::Token
- Ferret::Analysis::TokenStream
- Ferret::Analysis::WhiteSpaceAnalyzer
- Ferret::Analysis::WhiteSpaceTokenizer
- Ferret::BlankSlate
- Ferret::BoostMixin
- Ferret::Browser
- Ferret::Browser::Controller
- Ferret::Browser::Delegator
- Ferret::Browser::DocumentController
- Ferret::Browser::ErrorController
- Ferret::Browser::HelpController
- Ferret::Browser::HomeController
- Ferret::Browser::TermController
- Ferret::Browser::TermVectorController
- Ferret::Browser::ViewHelper
- Ferret::Document
- Ferret::Field
- Ferret::FieldSymbol
- Ferret::FieldSymbolMethods
- Ferret::FileNotFoundError
- Ferret::Index
- Ferret::Index::FieldInfo
- Ferret::Index::FieldInfos
- Ferret::Index::Index
- Ferret::Index::IndexReader
- Ferret::Index::IndexWriter
- Ferret::Index::LazyDoc
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- Ferret::Index::TermDocEnum
- Ferret::Index::TermEnum
- Ferret::Index::TermVector
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- Ferret::Index::TermVector::TVTerm
- Ferret::ParseError
- Ferret::QueryParser
- Ferret::QueryParser::QueryParseException
- Ferret::Search
- Ferret::Search::BooleanQuery
- Ferret::Search::BooleanQuery::BooleanClause
- Ferret::Search::ConstantScoreQuery
- Ferret::Search::Explanation
- Ferret::Search::Filter
- Ferret::Search::FilteredQuery
- Ferret::Search::FuzzyQuery
- Ferret::Search::Hit
- Ferret::Search::MatchAllQuery
- Ferret::Search::MultiSearcher
- Ferret::Search::MultiTermQuery
- Ferret::Search::PhraseQuery
- Ferret::Search::PrefixQuery
- Ferret::Search::Query
- Ferret::Search::QueryFilter
- Ferret::Search::RangeFilter
- Ferret::Search::RangeQuery
- Ferret::Search::Searcher
- Ferret::Search::Sort
- Ferret::Search::SortField
- Ferret::Search::Spans
- Ferret::Search::Spans::SpanFirstQuery
- Ferret::Search::Spans::SpanMultiTermQuery
- Ferret::Search::Spans::SpanNearQuery
- Ferret::Search::Spans::SpanNotQuery
- Ferret::Search::Spans::SpanOrQuery
- Ferret::Search::Spans::SpanPrefixQuery
- Ferret::Search::Spans::SpanTermQuery
- Ferret::Search::TermQuery
- Ferret::Search::TopDocs
- Ferret::Search::TypedRangeFilter
- Ferret::Search::TypedRangeQuery
- Ferret::Search::WildcardQuery
- Ferret::StateError
- Ferret::Store
- Ferret::Store::Directory
- Ferret::Store::FSDirectory
- Ferret::Store::Lock
- Ferret::Store::Lock::LockError
- Ferret::Store::RAMDirectory
- Ferret::Utils
- Ferret::Utils::BitVector
- Ferret::Utils::MultiMapper
- Ferret::Utils::PriorityQueue
- WEBrick
- WEBrick::FerretBrowserHandler
- Date
- DateTime
- FileUtils
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- Integer
- String
- Symbol
- Time

No matching classes.

# Ferret::Search::Filter

## Summary

A Filter is used to filter query results. It is usually passed to one of Searcher's search methods however it can also be used inside a ConstantScoreQuery or a FilteredQuery. To implement your own Filter you must implement the method get_bitvector(index_reader) which returns a BitVector with set bits corresponding to documents that are allowed by this Filter.

TODO add support for user implemented Filter. TODO add example of user implemented Filter.

### Public Instance Methods

bits(index_reader) → bit_vector click to toggle source

Get the bit_vector used by this filter. This method will usually be used to group filters or apply filters to other filters.

    static VALUE
    frb_f_get_bits(VALUE self, VALUE rindex_reader)
    {
        BitVector *bv;
        IndexReader *ir;
        GET_F();
        Data_Get_Struct(rindex_reader, IndexReader, ir);
        bv = filt_get_bv(f, ir);
        return frb_get_bv(bv);
    }

to_s → string click to toggle source

Return a human readable string representing the Filter object that the method was called on.

    static VALUE
    frb_f_to_s(VALUE self)
    {
        VALUE rstr;
        char *str;
        GET_F();
        str = f->to_s(f);
        rstr = rb_str_new2(str);
        free(str);
        return rstr;
    }

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