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.\" ========================================================================
.\"
.IX Title "MixinFactory 3pm"
.TH MixinFactory 3pm "2009-12-10" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Class::MixinFactory \- Class Factory with Selection of Mixins
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&  package MyClass;
\&  use Class::MixinFactory \-hasafactory;
\&  sub new { ... }
\&  sub foo { return "Foo Bar" }
\&
\&  package MyClass::Logging;
\&  sub foo { warn "Calling foo"; (shift)\->NEXT(\*(Aqfoo\*(Aq, @_) }
\&
\&  package MyClass::UpperCase;
\&  sub foo { uc( (shift)\->NEXT(\*(Aqfoo\*(Aq, @_) ) }
\&
\&  package main;
\&
\&  my $class = MyClass\->class( \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq );
\&  print $class\->new()\->foo(); 
\&  # Calls MyClass::Logging::foo, MyClass::UpperCase::foo, MyClass::foo
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This distribution facilitates the run-time generation of classes which inherit from a base class and some optional selection of mixin classes.
.PP
A factory is provided to generate the mixed classes with multiple inheritance. 
A \s-1NEXT\s0 method allows method redispatch up the inheritance chain.
.SH "USAGE"
.IX Header "USAGE"
The Class::MixinFactory package is just a facade that loads the necessary classes and provides a few import options for compile-time convenience.
.SS "Factory Interface"
.IX Subsection "Factory Interface"
To generate an object with some combination of mixins, you first pass the names of the mixin classes to a class factory which will generate a mixed class. (Or return the name of the already generated class, if there has been a previous request with the same combination of mixins.)
.PP
You can add a factory method to your base class, create a separate factory object, or inherit to produce a factory class.
.IP "Factory Method" 4
.IX Item "Factory Method"
To add a factory method to a base class, inherit from the Class::MixinFactory::HasAFactory class, or use the \f(CW\*(C`\-hasafactory\*(C'\fR import option:
.Sp
.Vb 2
\&  package MyClass;
\&  use Class::MixinFactory \-hasafactory;
\&
\&  package main;
\&  my $class = MyClass\->class( \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq );
\&  print $class\->new()\->foo();
.Ve
.IP "Factory Class" 4
.IX Item "Factory Class"
To create a new class which will act as a factory for another base class, inherit from the Class::MixinFactory::Factory class, or use the \f(CW\*(C`\-isafactory\*(C'\fR import option:
.Sp
.Vb 3
\&  package MyClass::Factory;
\&  use Class::MixinFactory \-isafactory;
\&  MyClass::Factory\->base_class( "MyClass" );
\&
\&  package main;
\&  my $class = MyClass::Factory\->class( \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq );
\&  print $class\->new()\->foo();
.Ve
.IP "Factory Object" 4
.IX Item "Factory Object"
To create an object which will act as a factory, create a Class::MixinFactory::Factory instance by calling the \fInew()\fR method:
.Sp
.Vb 3
\&  use Class::MixinFactory;
\&  my $factory = Class::MixinFactory\->new();
\&  $factory\->base_class( "MyClass" );
\&
\&  my $class = $factory\->class( \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq );
\&  print $class\->new()\->foo();
.Ve
.SS "Inheriting from a Mixed Class"
.IX Subsection "Inheriting from a Mixed Class"
.IP "Inheriting with a Factory Method or Factory Object" 4
.IX Item "Inheriting with a Factory Method or Factory Object"
A subclass can inherit from a mixed class:
.Sp
.Vb 3
\&  package MyClass::CustomWidget;
\&  @ISA = MyClass\->class( \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq );
\&  sub foo { local $_ = (shift)\->NEXT(\*(Aqfoo\*(Aq, @_); tr[a\-z][z\-a]; $_ }
\&
\&  package main;
\&  print MyClass::CustomWidget\->new()\->foo();
.Ve
.IP "Inheriting with a Factory Class" 4
.IX Item "Inheriting with a Factory Class"
A subclass can use a factory class to define its own inheritance:
.Sp
.Vb 4
\&  package MyClass::CustomWidget;
\&  use Class::MixinFactory \-isasubclass,
\&        MyClass::Factory => \*(AqLogging\*(Aq, \*(AqUpperCase\*(Aq;
\&  sub foo { local $_ = (shift)\->NEXT(\*(Aqfoo\*(Aq, @_); tr[a\-z][z\-a]; $_ }
\&
\&  package main;
\&  print MyClass::CustomWidget\->new()\->foo();
.Ve
.SS "Configuring a Factory"
.IX Subsection "Configuring a Factory"
Factories support methods that control which classes they will use.
.PP
The base class will be inherited from by all mixed classes.
.PP
.Vb 1
\&  $factory\->base_class( "HelloWorld" );
.Ve
.PP
The mixin prefix is prepended to the mixin names passed to the \fIclass()\fR method. Mixin names that contain a \*(L"::\*(R" are assumed to be fully qualified and are not changed. If empty, the base_class is used.
.PP
.Vb 1
\&  $factory\->mixin_prefix( \*(AqHelloFeature\*(Aq );
.Ve
.PP
The mixed prefix is at the start of all generated class names. If empty, the base_class is used, or the factory's class name.
.PP
.Vb 1
\&  $factory\->mixed_prefix( \*(AqHelloClass\*(Aq );
.Ve
.SS "Writing a Mixin Class"
.IX Subsection "Writing a Mixin Class"
Writing a mixin class is almost the same as writing a subclass, except where methods need to redispatch to the base-class implementation. (The SUPER::method syntax will only search for classes that the mixin itself inherits from; to search back up the inheritance tree and explore other branches, another redispatch mechanism is needed.)
.PP
A method named \s-1NEXT\s0 is provided to continue the search through to the next class which provides a given method. The order in which mixins are stacked is significant, so the caller should understand how their behaviors interact. (See Class::MixinFactory::NEXT.)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
For distribution, installation, support, copyright and license 
information, see Class::MixinFactory::ReadMe.