Marvin Humphrey

NAME

KinoSearch1::Search::BooleanQuery - match boolean combinations of Queries

SYNOPSIS

    my $bool_query = KinoSearch1::Search::BooleanQuery->new;
    $bool_query->add_clause( query => $term_query, occur => 'MUST' );
    my $hits = $searcher->search( query => $bool_query );

DESCRIPTION

BooleanQueries are super-Query objects which match boolean combinations of other Queries.

One way of producing a BooleanQuery is to feed a query string along the lines of this AND NOT that to a QueryParser object:

    my $bool_query = $query_parser->parse( 'this AND NOT that' );

It's also possible to achieve the same end by manually constructing the query piece by piece:

    my $bool_query = KinoSearch1::Search::BooleanQuery->new;
    
    my $this_query = KinoSearch1::Search::TermQuery->new(
        term => KinoSearch1::Index::Term->new( 'bodytext', 'this' ),
    );
    $bool_query->add_clause( query => $this_query, occur => 'MUST' );

    my $that_query = KinoSearch1::Search::TermQuery->new(
        term => KinoSearch1::Index::Term->new( 'bodytext', 'that' ),
    );
    $bool_query->add_clause( query => $that_query, occur => 'MUST_NOT' );

QueryParser objects and hand-rolled Queries can work together:

    my $general_query = $query_parser->parse($q);
    my $news_only     = KinoSearch1::Search::TermQuery->new(
        term => KinoSearch1::Index::Term->new( 'category', 'news' );
    );
    $bool_query->add_clause( query => $general_query, occur => 'MUST' );
    $bool_query->add_clause( query => $news_only,     occur => 'MUST' );

METHODS

new

    my $bool_query = KinoSearch1::Search::BooleanQuery->new;

Constructor. Takes no arguments.

add_clause

    $bool_query->add_clause(
        query => $query, # required
        occur => 'MUST', # default: 'SHOULD'
    );

Add a clause to the BooleanQuery. Takes hash-style parameters:

  • query - an object which belongs to a subclass of KinoSearch1::Search::Query.

  • occur - must be one of three possible values: 'SHOULD', 'MUST', or 'MUST_NOT'.

COPYRIGHT

Copyright 2005-2010 Marvin Humphrey

LICENSE, DISCLAIMER, BUGS, etc.

See KinoSearch1 version 1.01.




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