Class: Ferret::Search::Filter

### Home Classes Methods

### In Files

- ext/r_search.c

### Parent

Object

### Methods

- #bits
- #to_s

### Files

- MIT-LICENSE
- README
- TODO
- TUTORIAL

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# 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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