TAP::Parser::IteratorFactory(3pm)			 Perl Programmers Reference Guide			 TAP::Parser::IteratorFactory(3pm)

NAME

       TAP::Parser::IteratorFactory - Figures out which SourceHandler objects to use for a given Source

VERSION

       Version 3.26

SYNOPSIS

	 use TAP::Parser::IteratorFactory;
	 my $factory = TAP::Parser::IteratorFactory->new({ %config });
	 my $iterator  = $factory->make_iterator( $filename );

DESCRIPTION

       This is a factory class that takes a TAP::Parser::Source and runs it through all the registered TAP::Parser::SourceHandlers to see which
       one should handle the source.

       If you're a plugin author, you'll be interested in how to "register_handler"s, how "detect_source" works.

METHODS

   Class Methods
       "new"

       Creates a new factory class:

	 my $sf = TAP::Parser::IteratorFactory->new( $config );

       $config is optional.  If given, sets "config" and calls "load_handlers".

       "register_handler"

       Registers a new TAP::Parser::SourceHandler with this factory.

	 __PACKAGE__->register_handler( $handler_class );

       "handlers"

       List of handlers that have been registered.

   Instance Methods
       "config"

	my $cfg = $sf->config;
	$sf->config({ Perl => { %config } });

       Chaining getter/setter for the configuration of the available source handlers.  This is a hashref keyed on handler class whose values
       contain config to be passed onto the handlers during detection & creation.  Class names may be fully qualified or abbreviated, eg:

	 # these are equivalent
	 $sf->config({ 'TAP::Parser::SourceHandler::Perl' => { %config } });
	 $sf->config({ 'Perl' => { %config } });

       "load_handlers"

	$sf->load_handlers;

       Loads the handler classes defined in "config".  For example, given a config:

	 $sf->config({
	   MySourceHandler => { some => 'config' },
	 });

       "load_handlers" will attempt to load the "MySourceHandler" class by looking in @INC for it in this order:

	 TAP::Parser::SourceHandler::MySourceHandler
	 MySourceHandler

       "croak"s on error.

       "make_iterator"

	 my $iterator = $src_factory->make_iterator( $source );

       Given a TAP::Parser::Source, finds the most suitable TAP::Parser::SourceHandler to use to create a TAP::Parser::Iterator (see
       "detect_source").  Dies on error.

       "detect_source"

       Given a TAP::Parser::Source, detects what kind of source it is and returns one TAP::Parser::SourceHandler (the most confident one).  Dies
       on error.

       The detection algorithm works something like this:

	 for (@registered_handlers) {
	   # ask them how confident they are about handling this source
	   $confidence{$handler} = $handler->can_handle( $source )
	 }
	 # choose the most confident handler

       Ties are handled by choosing the first handler.

SUBCLASSING

       Please see "SUBCLASSING" in TAP::Parser for a subclassing overview.

   Example
       If we've done things right, you'll probably want to write a new source, rather than sub-classing this (see TAP::Parser::SourceHandler for
       that).

       But in case you find the need to...

	 package MyIteratorFactory;

	 use strict;
	 use vars '@ISA';

	 use TAP::Parser::IteratorFactory;

	 @ISA = qw( TAP::Parser::IteratorFactory );

	 # override source detection algorithm
	 sub detect_source {
	   my ($self, $raw_source_ref, $meta) = @_;
	   # do detective work, using $meta and whatever else...
	 }

	 1;

AUTHORS

       Steve Purkis

ATTRIBUTION

       Originally ripped off from Test::Harness.

       Moved out of TAP::Parser & converted to a factory class to support extensible TAP source detective work by Steve Purkis.

SEE ALSO

       TAP::Object, TAP::Parser, TAP::Parser::SourceHandler, TAP::Parser::SourceHandler::File, TAP::Parser::SourceHandler::Perl,
       TAP::Parser::SourceHandler::RawTAP, TAP::Parser::SourceHandler::Handle, TAP::Parser::SourceHandler::Executable

perl v5.18.2							    2014-01-06					 TAP::Parser::IteratorFactory(3pm)