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Class::Inspector(3)                  User Contributed Perl Documentation                 Class::Inspector(3)



NAME
       Class::Inspector - Get information about a class and its structure

SYNOPSIS
         use Class::Inspector;

         # Is a class installed and/or loaded
         Class::Inspector->installed( 'Foo::Class' );
         Class::Inspector->loaded( 'Foo::Class' );

         # Filename related information
         Class::Inspector->filename( 'Foo::Class' );
         Class::Inspector->resolved_filename( 'Foo::Class' );

         # Get subroutine related information
         Class::Inspector->functions( 'Foo::Class' );
         Class::Inspector->function_refs( 'Foo::Class' );
         Class::Inspector->function_exists( 'Foo::Class', 'bar' );
         Class::Inspector->methods( 'Foo::Class', 'full', 'public' );

         # Find all loaded subclasses or something
         Class::Inspector->subclasses( 'Foo::Class' );

DESCRIPTION
       Class::Inspector allows you to get information about a loaded class. Most or all of this information
       can be found in other ways, but they aren't always very friendly, and usually involve a relatively
       high level of Perl wizardry, or strange and unusual looking code. Class::Inspector attempts to
       provide an easier, more friendly interface to this information.

METHODS
   installed $class
       The "installed" static method tries to determine if a class is installed on the machine, or at least
       available to Perl. It does this by wrapping around "resolved_filename".

       Returns true if installed/available, false if the class is not installed, or "undef" if the class
       name is invalid.

   loaded $class
       The "loaded" static method tries to determine if a class is loaded by looking for symbol table
       entries.

       This method it uses to determine this will work even if the class does not have its own file, but is
       contained inside a single file with multiple classes in it. Even in the case of some sort of run-time
       loading class being used, these typically leave some trace in the symbol table, so an Autoload or
       Class::Autouse-based class should correctly appear loaded.

       Returns true if the class is loaded, false if not, or "undef" if the class name is invalid.

   filename $class
       For a given class, returns the base filename for the class. This will NOT be a fully resolved
       filename, just the part of the filename BELOW the @INC entry.

         print Class->filename( 'Foo::Bar' );
         > Foo/Bar.pm

       This filename will be returned with the right seperator for the local platform, and should work on
       all platforms.

       Returns the filename on success or "undef" if the class name is invalid.

   resolved_filename $class, @try_first
       For a given class, the "resolved_filename" static method returns the fully resolved filename for a
       class. That is, the file that the class would be loaded from.

       This is not nescesarily the file that the class WAS loaded from, as the value returned is determined
       each time it runs, and the @INC include path may change.

       To get the actual file for a loaded class, see the "loaded_filename" method.

       Returns the filename for the class, or "undef" if the class name is invalid.

   loaded_filename $class
       For a given loaded class, the "loaded_filename" static method determines (via the %INC hash) the name
       of the file that it was originally loaded from.

       Returns a resolved file path, or false if the class did not have it's own file.

   functions $class
       For a loaded class, the "functions" static method returns a list of the names of all the functions in
       the classes immediate namespace.

       Note that this is not the METHODS of the class, just the functions.

       Returns a reference to an array of the function names on success, or "undef" if the class name is
       invalid or the class is not loaded.

   function_refs $class
       For a loaded class, the "function_refs" static method returns references to all the functions in the
       classes immediate namespace.

       Note that this is not the METHODS of the class, just the functions.

       Returns a reference to an array of "CODE" refs of the functions on success, or "undef" if the class
       is not loaded.

   function_exists $class, $function
       Given a class and function name the "function_exists" static method will check to see if the function
       exists in the class.

       Note that this is as a function, not as a method. To see if a method exists for a class, use the
       "can" method for any class or object.

       Returns true if the function exists, false if not, or "undef" if the class or function name are
       invalid, or the class is not loaded.

   methods $class, @options
       For a given class name, the "methods" static method will returns ALL the methods available to that
       class. This includes all methods available from every class up the class' @ISA tree.

       Returns a reference to an array of the names of all the available methods on success, or "undef" if
       the class name is invalid or the class is not loaded.

       A number of options are available to the "methods" method that will alter the results returned. These
       should be listed after the class name, in any order.

         # Only get public methods
         my $method = Class::Inspector->methods( 'My::Class', 'public' );

       public
           The "public" option will return only 'public' methods, as defined by the Perl convention of
           prepending an underscore to any 'private' methods. The "public" option will effectively remove
           any methods that start with an underscore.

       private
           The "private" options will return only 'private' methods, as defined by the Perl convention of
           prepending an underscore to an private methods. The "private" option will effectively remove an
           method that do not start with an underscore.

           Note: The "public" and "private" options are mutually exclusive

       full
           "methods" normally returns just the method name. Supplying the "full" option will cause the
           methods to be returned as the full names. That is, instead of returning "[ 'method1', 'method2',
           'method3' ]", you would instead get "[ 'Class::method1', 'AnotherClass::method2',
           'Class::method3' ]".

       expanded
           The "expanded" option will cause a lot more information about method to be returned. Instead of
           just the method name, you will instead get an array reference containing the method name as a
           single combined name, ala "full", the seperate class and method, and a CODE ref to the actual
           function ( if available ). Please note that the function reference is not guarenteed to be
           available. "Class::Inspector" is intended at some later time, work with modules that have some
           some of common run-time loader in place ( e.g "Autoloader" or "Class::Autouse" for example.

           The response from "methods( 'Class', 'expanded' )" would look something like the following.

             [
               [ 'Class::method1',   'Class',   'method1', \&Class::method1   ],
               [ 'Another::method2', 'Another', 'method2', \&Another::method2 ],
               [ 'Foo::bar',         'Foo',     'bar',     \&Foo::bar         ],
             ]

   subclasses $class
       The "subclasses" static method will search then entire namespace (and thus all currently loaded
       classes) to find all classes that are subclasses of the class provided as a the parameter.

       The actual test will be done by calling "isa" on the class as a static method. (i.e.
       "My::Class->isa($class)".

       Returns a reference to a list of the loaded classes that match the class provided, or false is none
       match, or "undef" if the class name provided is invalid.

SUPPORT
       Bugs should be reported via the CPAN bug tracker

       http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Class-Inspector
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Class-Inspector>

       For other issues, or commercial enhancement or support, contact the author.

AUTHOR
       Adam Kennedy <adamk@cpan.org>

SEE ALSO
       <http://ali.as/>, Class::Handle

COPYRIGHT
       Copyright 2002 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

       The full text of the license can be found in the LICENSE file included with this module.



perl v5.12.5                                     2011-01-26                              Class::Inspector(3)