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.\" ========================================================================
.\"
.IX Title "Plucene::Search::Query 3pm"
.TH Plucene::Search::Query 3pm "2018-04-02" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Plucene::Search::Query \- base class for queries
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&        my $s_query = Plucene::Search::Query::Subclass\->new({
\&                boost => $boost_factor});
\&
\&        my $scorer = $s_query\->scorer($query, $searcher, $reader);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is an abstract base class for queries.
.PP
A query is a specification of the content an properties of the desired 
documents. Every search is done by matching a query against the document 
index and locating the ones that match the query.
.PP
The simplest query specifies a single term (or word) that is to be matched 
against a single field (e.g. 'author') of each of the documents in the index. 
This kind of query matches any document that contains the term in the 
specified field.
.PP
A more complex queries may contain nested queries with 'and', 'or', 'not' 
or 'phrase' relations. Queries may also contains specification of which 
document fields to match against the various parts of the query 
(.e.g.  'authors' and 'title') and hints that may effects the ranking of 
the matched documents ('boost' factor).
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
.Vb 2
\&        my $s_query = Plucene::Search::Query::Subclass\->new({
\&                boost => $boost_factor});
.Ve
.SS "boost"
.IX Subsection "boost"
Get / set this attribute
.SS "scorer"
.IX Subsection "scorer"
.Vb 2
\&        my $scorer = $s_query\->scorer
\&                (Plucene::Search::Query $query, $searcher, $reader);
.Ve
.SS "prepare"
.IX Subsection "prepare"
Does nothing
.SS "sum_squared_weights / normalize  / _scorer"
.IX Subsection "sum_squared_weights / normalize / _scorer"
These must be defined in a subclass