TAP::Parser::IteratorFactory - Online Linux Manual PageSection : 3
Updated : 2022-01-21
Source : perl v5.34.0
Note : User Contributed Perl Documentation

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NAMETAP::Parser::IteratorFactory − Figures out which SourceHandler objects to use for a given Source

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VERSIONVersion 3.43

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

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DESCRIPTIONThis 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.

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METHODS

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Class Methodsnew 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.

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Instance Methodsconfig ​ 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 ​croaks 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.

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SUBCLASSINGPlease see ‟SUBCLASSING” in TAP::Parser for a subclassing overview.

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ExampleIf 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 base '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;

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AUTHORSSteve Purkis

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ATTRIBUTIONOriginally 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.

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SEE ALSOTAP::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 0

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