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Class::Inspector(3pm) User Contributed Perl Documentation Class::Inspector(3pm)
NAME
Class::Inspector - Get information about a class and its structure
VERSION
version 1.36
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
my $bool = Class::Inspector->installed($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
my $bool = Class::Inspector->loaded($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
my $filename = Class::Inspector->filename($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 separator 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
my $filename = Class::Inspector->resolved_filename($class);
my $filename = Class::Inspector->resolved_filename($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 necessarily 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
my $filename = Class::Inspector->loaded_filename($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
my $arrayref = Class::Inspector->functions($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
my $arrayref = Class::Inspector->function_refs($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
my $bool = Class::Inspector->function_exists($class, $functon);
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
my $arrayref = Class::Inspector->methods($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, a la "full", the separate class and method,
and a CODE ref to the actual function ( if available ). Please note that the function
reference is not guaranteed to be available. "Class::Inspector" is intended at some
later time, to work with modules that have some kind 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
my $arrayref = Class::Inspector->subclasses($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.
SEE ALSO
<http://ali.as/>, Class::Handle, Class::Inspector::Functions
AUTHOR
Original author: Adam Kennedy <adamk AT cpan.org>
Current maintainer: Graham Ollis <plicease AT cpan.org>
Contributors:
Tom Wyant
Steffen Muller
Kivanc Yazan (KYZN)
COPYRIGHT AND LICENSE
This software is copyright (c) 2002-2019 by Adam Kennedy.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
perl v5.28.1 2019-07-22 Class::Inspector(3pm)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-12-12 19:51 @3.16.217.221 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)