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Manual Reference Pages  -  ROSE::CLASS::MAKEMETHODS::SET (3)

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NAME

Rose::Class::MakeMethods::Set - Create class methods to manage sets.

CONTENTS

SYNOPSIS



  package MyClass;

  use Rose::Class::MakeMethods::Set
  (
    inheritable_set =>
    [
      required_name =>
      {
        add_implies => add_valid_name,
        test_method => name_is_required,
      },
    ],

    inherited_set =>
    [
      valid_name =>
      {
        test_method => name_is_valid,
      },
    ],
  );

  ...

  package MySubClass;
  our @ISA = qw(MyClass);
  ...

  MyClass->add_valid_names(A, B, C);
  MyClass->add_required_name(D);

  $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
  $r1 = join(,, MyClass->required_names);    # D

  $v2 = join(,, MySubClass->valid_names);    # A,B,C,D;
  $r2 = join(,, MySubClass->required_names); # D

  MySubClass->add_required_names(X, Y);

  $v2 = join(,, MySubClass->valid_names);    # A,B,C,D,X,Y;
  $r2 = join(,, MySubClass->required_names); # D,X,Y

  MySubClass->delete_valid_names(B, X);

  $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
  $r1 = join(,, MyClass->required_names);    # D

  $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
  $r2 = join(,, MySubClass->required_names); # D,X,Y

  MySubClass->delete_required_name(D);

  $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
  $r1 = join(,, MyClass->required_names);    # D

  $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
  $r2 = join(,, MySubClass->required_names); # X,Y



DESCRIPTION

Rose::Class::MakeMethods::Set is a method maker that inherits from Rose::Object::MakeMethods. See the Rose::Object::MakeMethods documentation to learn about the interface. The method types provided by this module are described below. All methods work only with classes, not objects.

METHODS TYPES

<B>inheritable_setB> Create a family of class methods for managing an inheritable set of items, each with an optional associated value. Each item must be a string, or must stringify to a unique string value, since a hash is used internally to store the set.

The set is inherited by subclasses, but any subclass that accesses or manipulates the set in any way will immediately get its own private copy of the set as it exists in the superclass at the time of the access or manipulation. The superclass from which the set is copied is the closest (least super) class that has ever accessed or manipulated this set.

These may sound like wacky rules, but it may help to know that this family of methods was created for use in the Rose::HTML::Objects family of modules to manage the set of required HTML attributes (and their optional default values) for various HTML tags.
Options
add_implies A method name, or reference to a list of method names, to call when an item is added to the set. Each added attribute is passed as an argument to each method in the add_implies list.
add_method The name of the class method used to add a single item to the set. Defaults to the method name with the prefix add_ added.
adds_method The name of the class method used to add one or more items to the set. Defaults to add_method with s added to the end.
clear_method The name of the class method used to clear the contents of the set. Defaults to plural_name with a clear_ prefix added.
delete_implies A method name, or reference to a list of method names, to call when an item is removed from the set. Each deleted attribute is passed as an argument to each method in the delete_implies list.
delete_method The name of the class method used to remove a single item from the set. Defaults to the method name with the prefix delete_ added.
deletes_method The name of the class method used to remove one or more items from the set. Defaults to plural_name with a delete_ prefix added.
hash_method The name of the class method that returns a reference to the actual hash that contains the set of items in scalar context, and a shallow copy of the hash in list context. Defaults to plural_name with _hash added to the end.
interface Choose the interface. This is kind of pointless since there is only one interface right now. Defaults to all, obviously.
list_method The name of the class method that returns a reference to a sorted list of items in scalar context, or a sorted list in list context. If called with any arguments, the set is cleared with a call to clear_method, then the set is repopulated by passing all of the arguments to a call to adds_method. The method name defaults to plural_name.
plural_name The plural name of the items, used to construct the default names for some other methods. Defaults to the method name with s added.
test_method The name of the class method that tests for the existence of an item in the set. Defaults to the method name with the prefix is_ added.
value_method The name of the class method used to get and set the (optional) value associated with each item in the set. Defaults to the method name with _value added to the end.
Interfaces
all Creates the entire family of methods described above. The example below illustrates their use.

Example:



    package MyClass;

    use Rose::Class::MakeMethods::Set
    (
      inheritable_set =>
      [
        valid_name =>
        {
          test_method    => name_is_valid,
          delete_implies => delete_required_name,
        },

        required_name =>
        {
          add_implies => add_valid_name,
          test_method => name_is_required,
        },
      ],
    );

    package MySubClass;
    our @ISA = qw(MyClass);
    ...

    MyClass->add_valid_names(A, B, C);
    MyClass->add_required_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
    $r1 = join(,, MyClass->required_names);    # D

    $v2 = join(,, MySubClass->valid_names);    # A,B,C,D;
    $r2 = join(,, MySubClass->required_names); # D

    MySubClass->add_required_names(X, Y);

    $v2 = join(,, MySubClass->valid_names);    # A,B,C,D,X,Y;
    $r2 = join(,, MySubClass->required_names); # D,X,Y

    MySubClass->delete_valid_names(B, X);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
    $r1 = join(,, MyClass->required_names);    # D

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # D,Y

    MySubClass->delete_required_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
    $r1 = join(,, MyClass->required_names);    # D

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # Y

    MyClass->name_is_required(D);    # true
    MySubClass->name_is_required(D); # false

    $h = MyClass->valid_names_hash;

    # Careful!  This is the actual hash used for set storage!
    # You should use delete_valid_name() instead!
    delete $h->{C};

    MySubClass->required_name_value(Y => xval);

    print MySubClass->required_name_value(Y); # xval

    %r = MySubClass->required_names_hash;

    print $r{Y}; # xval

    # Okay: %r is a (shallow) copy, not the actual hash
    delete $r{Y};



<B>inherited_setB> Create a family of class methods for managing an inherited set of items. Each item must be a string, or must stringify to a unique string value, since a hash is used internally to store the set.

An inherited set is made up of the union of the sets of all superclasses, minus any items that are explicitly deleted in the current class.
Options
add_implies A method name, or reference to a list of method names, to call when an item is added to the set. Each added attribute is passed as an argument to each method in the add_implies list.
add_method The name of the class method used to add a single item to the set. Defaults to the method name with the prefix add_ added.
adds_method The name of the class method used to add one or more items to the set. Defaults to add_method with s added to the end.
cache_method The name of the class method used to retrieve (or generate, if it doesn’t exist) the internal cache for the set. This should be considered a private method, but it is listed here because it does take up a spot in the method namespace. Defaults to plural_name with _cache added to the end.
clear_method The name of the class method used to clear the contents of the set. Defaults to plural_name with a clear_ prefix added.
delete_implies A method name, or reference to a list of method names, to call when an item is removed from the set. Each deleted attribute is passed as an argument to each method in the delete_implies list.
delete_method The name of the class method used to remove a single item from the set. Defaults to the method name with the prefix delete_ added.
deletes_method The name of the class method used to remove one or more items from the set. Defaults to plural_name with a delete_ prefix added.
hash_method The name of the class method that returns a hash (in list context) or a reference to a hash (in scalar context) that contains the set of items. The existence of a key in the hash indicates its existence in the set. Defaults to plural_name with _hash added to the end.
inherit_method The name of the class method used to indicate that an inherited value that was previously deleted from the set should return to being inherited. Defaults to the method name with the prefix inherit_ added.
inherits_method The name of the class method used to indicate that one or more inherited values that were previously deleted from the set should return to being inherited. Defaults to the inherit_method name with s added to the end.
interface Choose the interface. This is kind of pointless since there is only one interface right now. Defaults to all, obviously.
list_method The name of the class method that returns a reference to a sorted list of items in scalar context, or a sorted list in list context. If called with any arguments, the set is cleared with a call to clear_method, then the set is repopulated by passing all of the arguments to a call to adds_method. The method name defaults to plural_name.
plural_name The plural name of the items, used to construct the default names for some other methods. Defaults to the method name with s added.
test_method The name of the class method that tests for the existence of an item in the set. Defaults to the method name with the prefix is_ added.
Interfaces
all Creates the entire family of methods described above. The example below illustrates their use.

Example:



    package MyClass;

    use Rose::Class::MakeMethods::Set
    (
      inherited_set =>
      [
        valid_name =>
        {
          test_method     => name_is_valid,
          delete_implies  => delete_required_name,
          inherit_implies => inherit_required_name,
        },

        required_name =>
        {
          add_implies => add_valid_name,
          test_method => name_is_required,
        },
      ],
    );
    ...

    package MySubClass;
    our @ISA = qw(MyClass);
    ...

    MyClass->add_valid_names(A, B, C);
    MyClass->add_required_name(D);


    $v1 = join(,, MyClass->valid_names);       # A,B,C,D;
    $r1 = join(,, MyClass->required_names);    # D

    $v2 = join(,, MySubClass->valid_names);    # A,B,C,D;
    $r2 = join(,, MySubClass->required_names); # D

    MyClass->add_required_names(X, Y);

    $v2 = join(,, MySubClass->valid_names);    # A,B,C,D,X,Y;
    $r2 = join(,, MySubClass->required_names); # D,X,Y

    MySubClass->delete_valid_names(B, X);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D,X,Y;
    $r1 = join(,, MyClass->required_names);    # D,X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # D,Y

    MySubClass->delete_required_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D,X,Y;
    $r1 = join(,, MyClass->required_names);    # D,X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # Y

    MySubClass->inherit_required_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D,X,Y;
    $r1 = join(,, MyClass->required_names);    # D,X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # D,Y

    MySubClass->delete_valid_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D,X,Y;
    $r1 = join(,, MyClass->required_names);    # D,X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,Y;
    $r2 = join(,, MySubClass->required_names); # Y

    MySubClass->inherit_valid_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,D,X,Y;
    $r1 = join(,, MyClass->required_names);    # D,X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # D,Y

    MyClass->delete_valid_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,X,Y;
    $r1 = join(,, MyClass->required_names);    # X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,Y;
    $r2 = join(,, MySubClass->required_names); # Y

    MySubClass->add_required_name(D);

    $v1 = join(,, MyClass->valid_names);       # A,B,C,X,Y;
    $r1 = join(,, MyClass->required_names);    # X,Y

    $v2 = join(,, MySubClass->valid_names);    # A,C,D,Y;
    $r2 = join(,, MySubClass->required_names); # D,Y

    $h = MyClass->valid_names_hash;

    # This has no affect on the set.  $h is not a reference to the
    # actual hash used for set storage.
    delete $h->{C};

    $v1 = join(,, MyClass->valid_names);       # A,B,C,X,Y;
    $r1 = join(,, MyClass->required_names);    # X,Y



AUTHOR

John C. Siracusa (siracusa@gmail.com)

LICENSE

Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
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