NAME

       Lucy::Search::Matcher - Match a set of document ids.

SYNOPSIS

           # abstract base class

DESCRIPTION

       A Matcher iterates over a set of ascending document ids.  Some Matchers implement score()
       and can assign relevance scores to the docs that they match.  Other implementations may be
       match-only.

CONSTRUCTORS

   new()
           my $matcher = MyMatcher->SUPER::new;

       Abstract constructor.

ABSTRACT METHODS

   next()
       Proceed to the next doc id.

       Returns: A positive doc id, or 0 once the iterator is exhausted.

   get_doc_id()
       Return the current doc id.  Valid only after a successful call to next() or advance() and
       must not be called otherwise.

   score()
       Return the score of the current document.

       Only Matchers which are used for scored search need implement score().

METHODS

   advance(target)
       Advance the iterator to the first doc id greater than or equal to "target". The default
       implementation simply calls next() over and over, but subclasses have the option of doing
       something more efficient.

       •   target - A positive doc id, which must be greater than the current doc id once the
           iterator has been initialized.

       Returns: A positive doc id, or 0 once the iterator is exhausted.

INHERITANCE

       Lucy::Search::Matcher isa Lucy::Object::Obj.