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package App::Framework::Feature ; |
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=head1 NAME |
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App::Framework::Feature - Application feature |
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=head1 SYNOPSIS |
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Features are accessed via the App::Framework object, for example: |
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use App::Framework '+Config' ; |
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App::Framework::Feature is to be derived from and cannot be accessed directly. |
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=head1 DESCRIPTION |
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Provides the base object from which all features must be derived. |
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B |
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=cut |
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use strict ; |
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use Carp ; |
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our $VERSION = "1.001" ; |
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#============================================================================================ |
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# USES |
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#============================================================================================ |
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use App::Framework::Base ; |
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#============================================================================================ |
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# OBJECT HIERARCHY |
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#============================================================================================ |
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our @ISA = qw(App::Framework::Base) ; |
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#============================================================================================ |
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# GLOBALS |
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#============================================================================================ |
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=head2 FIELDS |
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The following fields should be defined either in the call to 'new()', as part of a 'set()' call, or called by their accessor method |
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(which is the same name as the field): |
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=over 4 |
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=item B - Parent application |
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Set by App::Framework as a reference to the application object. If this is not set, then the feature will skip any application-specific |
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logic (allowing a feature to be used in the user part of an application as a stand alone object). |
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=item B - list of registered application functions |
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ARRAY ref to list of functions that this feature wants to register in the application. When a registered function is called by the framework, |
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then the feature's method (of the same name) is also called. |
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Function name is of the form _entry (called at the start of ) or _exit (called at the end of ) |
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=item B - feature name |
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Set to the feature name (by the App::Framework). This is the name used by the application to access the feature |
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=back |
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=cut |
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my %FIELDS = ( |
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'app' => undef, |
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'registered' => [], |
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'name' => 'feature', |
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'feature_args' => "", # Feature-specific arguments string |
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'feature_options' => [], |
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); |
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#============================================================================================ |
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=head2 CONSTRUCTOR |
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=over 4 |
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=cut |
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#============================================================================================ |
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=item B< new([%args]) > |
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Create a new feature. |
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The %args are specified as they would be in the B method. |
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=cut |
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sub new |
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{ |
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my ($obj, %args) = @_ ; |
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my $class = ref($obj) || $obj ; |
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# Create object |
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my $this = $class->SUPER::new( |
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'priority' => $App::Framework::Base::PRIORITY_DEFAULT, # will be overridden by derived object |
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%args, |
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) ; |
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## do application-specific bits |
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$this->register_app() ; |
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return($this) ; |
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} |
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#============================================================================================ |
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=back |
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=head2 CLASS METHODS |
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=over 4 |
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=cut |
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#============================================================================================ |
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#----------------------------------------------------------------------------- |
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=item B< init_class([%args]) > |
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Initialises the object class variables. |
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=cut |
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sub init_class |
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{ |
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my $class = shift ; |
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my (%args) = @_ ; |
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# Add extra fields |
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$class->add_fields(\%FIELDS, \%args) ; |
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# init class |
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$class->SUPER::init_class(%args) ; |
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} |
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#---------------------------------------------------------------------------- |
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=item B |
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Returns 0 since this class can not have a class instance object |
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=cut |
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sub allowed_class_instance |
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{ |
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return 0 ; |
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} |
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#============================================================================================ |
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=back |
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=head2 OBJECT DATA METHODS |
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=over 4 |
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=cut |
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#============================================================================================ |
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##----------------------------------------------------------------------------- |
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# |
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#=item B< feature_args([$args]) > |
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# |
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#Get/set the feature's arguments. If specified, I<$args> may be either an ARRAY ref (which is saved as-is), |
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#or a SCALAR. In the case of the SCALAR, it is expected to be a space/comma separated list of argument |
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#strings which are parsed and converted into an ARRAY ref |
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# |
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#=cut |
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# |
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#sub feature_args |
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#{ |
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# my $this = shift ; |
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# my ($arg) = @_ ; |
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# |
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# if (defined($arg)) |
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# { |
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# if (ref($arg) eq 'ARRAY') |
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# { |
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# # use as-is |
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# } |
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# elsif (!ref($arg)) |
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# { |
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# # convert scalar |
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# my @list ; |
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# while ($arg =~ m/\s*([^\s,]+)[\s,]*/g) |
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# { |
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# push @list, $1 ; |
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# } |
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# |
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# $arg = \@list ; |
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# } |
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# else |
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# { |
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# $arg = undef ; |
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# } |
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# } |
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# |
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# return $this->SUPER::feature_args($arg) ; |
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#} |
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##----------------------------------------------------------------------------- |
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# |
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#=item B< feature_args([$args]) > |
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# |
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#Get/set the feature's arguments. If specified, I<$args> may be either an ARRAY ref (which is saved as-is), |
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#or a SCALAR. In the case of the SCALAR, it is expected to be a space/comma separated list of argument |
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#strings which are parsed and converted into an ARRAY ref |
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# |
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#=cut |
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# |
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#sub feature_args |
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#{ |
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# my $this = shift ; |
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# my ($arg) = @_ ; |
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# |
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#print "feature_args($arg) [$this]\n" ; |
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#$this->dump_callstack() ; |
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# |
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# return $this->SUPER::feature_args($arg) ; |
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#} |
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#============================================================================================ |
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=back |
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244
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=head2 OBJECT METHODS |
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246
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=over 4 |
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248
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=cut |
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#============================================================================================ |
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#----------------------------------------------------------------------------- |
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255
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=item B< register_app() > |
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257
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Registers this feature with the parent application framework (if specified) |
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=cut |
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261
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sub register_app |
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{ |
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1
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my $this = shift ; |
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265
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131
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2615
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my $app = $this->app ; |
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131
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100
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324
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if ($app) |
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{ |
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## if we need to, register our methods with the application framework |
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2761
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my $methods_aref = $this->registered ; |
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100
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377
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if (@$methods_aref) |
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{ |
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57
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1018
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$app->feature_register($this->name, $this, @$methods_aref) ; |
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} |
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} |
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} |
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277
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278
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279
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# ============================================================================================ |
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# END OF PACKAGE |
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282
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=back |
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284
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=head1 DIAGNOSTICS |
285
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286
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Setting the debug flag to level 1 prints out (to STDOUT) some debug messages, setting it to level 2 prints out more verbose messages. |
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288
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=head1 AUTHOR |
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290
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Steve Price C<< >> |
291
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292
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=head1 BUGS |
293
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294
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None that I know of! |
295
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296
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=cut |
297
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298
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299
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1; |
300
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301
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__END__ |