| Lucy::Search::Query - phpMan
Lucy::Search::Query(3) User Contributed Perl Documentation Lucy::Search::Query(3)
NAME
Lucy::Search::Query - A specification for a search query.
SYNOPSIS
# Query is an abstract base class.
package MyQuery;
use base qw( Lucy::Search::Query );
sub make_compiler {
my ( $self, %args ) = @_;
my $subordinate = delete $args{subordinate};
my $compiler = MyCompiler->new( %args, parent => $self );
$compiler->normalize unless $subordinate;
return $compiler;
}
package MyCompiler;
use base ( Lucy::Search::Compiler );
...
DESCRIPTION
Query objects are simple containers which contain the minimum information necessary to
define a search query.
The most common way to generate Query objects is to feed a search string such as 'foo AND
bar' to a QueryParser's parse() method, which outputs an abstract syntax tree built up
from various Query subclasses such as ANDQuery and TermQuery. However, it is also
possible to use custom Query objects to build a search specification which cannot be
easily represented using a search string.
Subclasses of Query must implement make_compiler(), which is the first step in compiling a
Query down to a Matcher which can actually match and score documents.
CONSTRUCTORS
new( [labeled params] )
my $query = MyQuery->SUPER::new(
boost => 2.5,
);
Abstract constructor.
· boost - A scoring multiplier, affecting the Query's relative contribution to each
document's score. Typically defaults to 1.0, but subclasses which do not contribute
to document scores such as NOTQuery and MatchAllQuery default to 0.0 instead.
ABSTRACT METHODS
make_compiler( [labeled params] )
Abstract factory method returning a Compiler derived from this Query.
· searcher - A Searcher.
· boost - A scoring multiplier.
· subordinate - Indicates whether the Query is a subquery (as opposed to a top-level
query). If false, the implementation must invoke normalize() on the newly minted
Compiler object before returning it.
METHODS
set_boost(boost)
Set the Query's boost.
get_boost()
Get the Query's boost.
INHERITANCE
Lucy::Search::Query isa Clownfish::Obj.
perl v5.20.2 2015-12-01 Lucy::Search::Query(3)
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