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.\" ========================================================================
.\"
.IX Title "UR::Object::Type 3pm"
.TH UR::Object::Type 3pm "2019-01-02" "perl v5.28.1" "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"
UR::Object::Type \- a meta\-class for any class or primitive type
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use UR;
\&
\&    class MyClass {
\&        is => [\*(AqParentClass1\*(Aq, \*(AqParentClass2\*(Aq],
\&        id_by => [
\&            id_prop1    => { is => \*(AqInteger\*(Aq },
\&            id_prop2    => { is => \*(AqString\*(Aq },
\&        ],
\&        has => [
\&            property_a  => { is => \*(AqString\*(Aq }
\&            property_b  => { is => \*(AqInteger\*(Aq, is_optional => 1 },
\&        ],
\&    };
\&
\&    my $meta = MyClass\->_\|_meta_\|_;
\&    
\&    my @parent_class_metas = $meta\->parents();
\&    # 2 meta objects, see UR::Object::Property
\&
\&    my @property_meta = $meta\->properties();
\&    # N properties (4, +1 from UR::Object, +? from ParentClass1 and ParentClass2)
\&    
\&    $meta\->is_abstract;
\&
\&    $meta\->...
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
UR::Object::Type implements the class behind the central metadata in the \s-1UR\s0
class framework.  It contains methods for introspection and manipulation of 
related class data.
.PP
A UR::Object::Type object describes UR::Object, and also
every subclass of UR::Object.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
In addition to describing UR::Object an each of its subclasses, 
UR::Object::Type is _itself_ a subclass of UR::Object.  This means
that the same query APIs used for regular objects can be used
for meta objects.
.PP
.Vb 4
\&   UR::Object  \-> has\-meta \-> UR::Object::Type
\&          A                         |
\&          \e                        / 
\&           \e\-\-\-\-\-<\- is\-a  <\-\-\-\-\-\-\-/
.Ve
.PP
Further, new classes which generate a new UR::Objec::Type,
also generate a new subclass for the meta-class.  This
means that each new class can have private meta methods,
(ala Ruby).
.PP
This means that extensions to a meta-class,
apply to the meta-class of its derivatives.
.PP
.Vb 3
\&     Regular                    Meta\-Class 
\&     Entity                     Singleton
\&     \-\-\-\-\-\-\-                    \-\-\-\-\-\-\-\-\-\-
\&
\&    Greyhound   has\-meta \->   Greyhound::Type
\&        |                          |
\&        V                          V
\&      is\-a                       is\-a 
\&        |                          |
\&        V                          V
\&       Dog      has\-meta \->    Dog::Type
\&        |                          |
\&        V                          V
\&      is\-a                       is\-a
\&        |                          |
\&        V                          V
\&      Animal    has\-meta \->   Animal::Type        
\&        |                          |
\&        V                          V
\&      is\-a                       is\-a
\&        |                          |     /\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\e
\&        V                          V     V                 |
\&   UR::Object   has\-meta \->   UR::Object::Type   has\-meta \-/ 
\&          A                      is\-a
\&          |                        |
\&           \e_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_\|_/
.Ve
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.ie n .IP """class""" 4
.el .IP "``class''" 4
.IX Item "class"
.Vb 1
\&  class MyClass1 {};
\&
\&  class MyClass2 { is => \*(AqMyClass1\*(Aq };
\&
\&  class MyClass3 {
\&      is => [\*(AqParent1\*(Aq,\*(AqParent2\*(Aq],
\&      is_abstract => 1,
\&      is_transient => 1,
\&      has => [ qw/p1 p2 p3/ ],
\&      doc => \*(Aqwoo hoo!\*(Aq
\&  };
.Ve
.Sp
The primary constructor is not a method on this class at all.
\&\s-1UR\s0 catches \*(L"class \s-1SOMENAME\s0 { ... }\*(R" and calls \fBdefine()\fR with
the parameters.
.IP "define" 4
.IX Item "define"
.Vb 4
\&  my $class_obj = UR::Object::Type\->define(
\&                      class_name => \*(AqMyClass\*(Aq,
\&                      ...
\&                  );
.Ve
.Sp
Register a class with the system.  The given class_name must be unique
within the application.  As a side effect, a new Perl namespace will be
created for the class's name, and methods will be injected into that
namespace for any of the class properties.  Other types of metadata
objects will get created to manage the properties and relationships
to other classes.  See the UR::Object::Type::Initializer documentation
for more information about the parameters \f(CW\*(C`define()\*(C'\fR accepts.
.IP "create" 4
.IX Item "create"
.Vb 4
\&  my $class_obj = UR::Object::Type\->create(
\&                      class_name => \*(AqNamespace::MyClass\*(Aq,
\&                      ...
\&                  );
.Ve
.Sp
Create a brand new class within an already existing \s-1UR\s0 namespace.
\&\f(CW\*(C`create()\*(C'\fR takes all the same parameters as \f(CW\*(C`define()\*(C'\fR.  Another side
effect of create is that when the application commits its Context,
a new Perl module will be created to implement the class, complete 
with a class definition.
.Sp
Applications will not normally use \fBcreate()\fR.
.SH "PROPERTIES"
.IX Header "PROPERTIES"
Each property has a method of the same name
.SS "External \s-1API\s0"
.IX Subsection "External API"
.IP "class_name" 4
.IX Item "class_name"
.Vb 1
\&    $name = $class_obj\->class_name
.Ve
.Sp
The name of the class.  Class names are unique within a \s-1UR\s0 namespace and an
application.
.Sp
This is symmetrical with \f(CW$class_obj\fR = \f(CW$name\fR\->_\|_meta_\|_.
.IP "properties" 4
.IX Item "properties"
.Vb 1
\&  @all = $class_obj\->properties();
\&  
\&  @some = $class_obj\->properties(
\&      \*(Aqis                    => [\*(AqText\*(Aq,\*(AqNumber\*(Aq]
\&      \*(Aqdoc like\*(Aq             => \*(Aq%important%\*(Aq,
\&      \*(Aqproperty_name like\*(Aq   => \*(Aqsomeprefix_%\*(Aq,
\&  );
.Ve
.Sp
Access the related property meta-objects for all properties of this class.  It includes 
the properties of any parent classes which are inherited by this class.
.Sp
See UR::Object::Property for details.
.IP "property" 4
.IX Item "property"
.Vb 1
\&  $property_meta = $class_obj\->property(\*(Aqsomeproperty\*(Aq);
.Ve
.Sp
The singular version of the above.  A single argument, as usual, is treated
as the remainder of the \s-1ID,\s0 and will select a property by name.
.IP "namespace" 4
.IX Item "namespace"
.Vb 1
\&  $namespace_name = $class_obj\->namespace
.Ve
.Sp
Returns the name of the class's \s-1UR\s0 namespace.
.IP "doc" 4
.IX Item "doc"
.Vb 1
\&  $doc = $class_obj\->doc
.Ve
.Sp
A place to put general class-specific notes.
.IP "data_source_id" 4
.IX Item "data_source_id"
.Vb 1
\&  $ds_id = $class_obj\->data_source_id
.Ve
.Sp
The name of the external data source behind this class.  Classes without
data sources cannot be saved and exist only during the life of the
application.  data_source_id will resolve to an UR::DataSource id.
.IP "table_name" 4
.IX Item "table_name"
.Vb 1
\&  $table_name = $class_object\->table_name
.Ve
.Sp
For classes with data sources, this is the name of the table within that
data source.  This is usually a table in a relational database.
.Sp
At a basic level, it is a storage directive interpreted by the data_source,
and may or may not related to a storage table at that level.
.IP "is_abstract" 4
.IX Item "is_abstract"
.Vb 1
\&  $bool = $class_obj\->is_abstract
.Ve
.Sp
A flag indicating if this is an abstract class.  Abstract classes cannot have
instances, but can be inherited by other classes.
.IP "is_final" 4
.IX Item "is_final"
.Vb 1
\&  $bool = $class_obj\->is_final
.Ve
.Sp
A flag indicating if this class cannot have subclasses.
.IP "is_singleton" 4
.IX Item "is_singleton"
.Vb 1
\&  $bool = $class_obj\->is_singleton
.Ve
.Sp
A flag indicating whether this is a singleton class.  If true, the class
will inherit from UR::Singleton.
.IP "is_transactional" 4
.IX Item "is_transactional"
.Vb 1
\&  $bool = $class_obj\->is_transactional
.Ve
.Sp
A flag indicating whether changes to this class's instances will be tracked.
Non-transactional objecs do not change when an in-memory transaction rolls back.
.Sp
It is similar to the is_transient meta-property, which does the same for an 
individual property.
.SS "Internal \s-1API\s0"
.IX Subsection "Internal API"
These methods return data about how this class relates to other classes.
.IP "namespace_meta" 4
.IX Item "namespace_meta"
.Vb 1
\&  $ns_meta = $class_obj\->namespace_meta
.Ve
.Sp
Returns the UR::Namespace object with the class's namespace name.
.IP "parent_class_names" 4
.IX Item "parent_class_names"
.Vb 1
\&  @names = $class_obj\->parent_class_names
.Ve
.Sp
Returns a list of the immediate parent classes.
.IP "parent_class_metas" 4
.IX Item "parent_class_metas"
.Vb 1
\&  @class_objs = $class_obj\->parent_class_metas
.Ve
.Sp
Returns a list of the class objects (UR::Object::Type instances) of the
immediate parent classes
.IP "ancestry_class_names" 4
.IX Item "ancestry_class_names"
.Vb 1
\&  @names = $class_obj\->ancestry_class_names
.Ve
.Sp
Returns a list of all the class names this class inherits from, directly or 
indirectly.  This list may have duplicate names if there is multiple
inheritance in the family tree.
.IP "ancestry_class_metas" 4
.IX Item "ancestry_class_metas"
.Vb 1
\&  @class_objs = $class_obj\->ancestry_class_metas
.Ve
.Sp
Returns a list of the class objects for each inherited class.
.IP "direct_property_names" 4
.IX Item "direct_property_names"
.Vb 1
\&  @names = $class_obj\->direct_property_names
.Ve
.Sp
Returns a list of the property names defined within this class.  This list
will not include the names of any properties inherited from parent classes
unless they have been overridden.
.IP "direct_property_metas" 4
.IX Item "direct_property_metas"
.Vb 1
\&  @property_objs = $class_obj\->direct_property_metas
.Ve
.Sp
Returns a list of the UR::Object::Property objects for each direct
property name.
.IP "ancestry_property_names" 4
.IX Item "ancestry_property_names"
.Vb 1
\&  @names = $class_obj\->ancestry_property_names
.Ve
.Sp
Returns a list of property names of the parent classes and their inheritance
hierarchy.  The list may include duplicates if a property is overridden
somewhere in the hierarchy.
.IP "ancestry_property_metas" 4
.IX Item "ancestry_property_metas"
.Vb 1
\&  @property_objs = $class_obj\->ancestry_property_metas;
.Ve
.Sp
Returns a list of the UR::Object::Property objects for each ancestry
property name.
.IP "all_property_names" 4
.IX Item "all_property_names"
Returns a list of property names of the given class and its inheritance
hierarchy.  The list may include duplicates if a property is overridden
somewhere in the hierarchy.
.IP "all_property_metas" 4
.IX Item "all_property_metas"
.Vb 1
\&  @property_objs = $class_obj\->all_property_metas;
.Ve
.Sp
Returns a list of the UR::Object::Property objects for each name returned
by all_property_names.
.IP "direct_id_property_names" 4
.IX Item "direct_id_property_names"
.Vb 1
\&  @names = $class_obj\->direct_id_property_names
.Ve
.Sp
Returns a list of the property names designated as \*(L"id\*(R" properties in the
class definition.
.IP "direct_id_property_metas" 4
.IX Item "direct_id_property_metas"
.Vb 1
\&  @property_objs = $class_obj\->direct_id_property_metas
.Ve
.Sp
Returns a list of the UR::Object::Property objects for each id property
name.
.IP "ancestry_id_property_names" 4
.IX Item "ancestry_id_property_names"
.PD 0
.IP "ancestry_id_property_metas" 4
.IX Item "ancestry_id_property_metas"
.IP "all_id_property_names" 4
.IX Item "all_id_property_names"
.IP "all_id_property_metas" 4
.IX Item "all_id_property_metas"
.PD
.Vb 4
\&  @names         = $class_obj\->ancestry_id_property_names;
\&  @property_objs = $class_obj\->ancestry_id_property_metas;
\&  @names         = $class_obj\->all_id_property_names;
\&  @property_objs = $class_obj\->all_id_property_metas;
.Ve
.Sp
Returns the property names or UR::Object::Property objects for either
the parent classes and their inheritance hierarchy, or for the given
class and all of its inheritance hierarchy.  The lists may include duplicates
if properties are overridden somewhere in the hierarchy.
.IP "unique_property_set_hashref" 4
.IX Item "unique_property_set_hashref"
.Vb 1
\&  $constraints = $class_obj\->unique_property_set_hashref
.Ve
.Sp
Return a hashref describing the unique constraints on the given class.  The
keys of \f(CW$constraint\fR are constraint names, and the values are listrefs of 
property names that make up the unique constraint.
.IP "add_unique_constraint" 4
.IX Item "add_unique_constraint"
.Vb 1
\&  $class_obj\->add_unique_constraint($constraint_name, @property_name_list)
.Ve
.Sp
Add a unique constraint to the given class.  It is an exception if the
given \f(CW$constraint_name\fR already exists as a constraint on this class or
its parent classes.
.IP "remove_unique_constraint" 4
.IX Item "remove_unique_constraint"
.Vb 1
\&  $class_obj\->remove_unique_constraint($constraint_name)
.Ve
.Sp
Remove a unique constraint from the given class.  It is an exception if
the given constraint name does not exist.
.IP "ancestry_table_names" 4
.IX Item "ancestry_table_names"
.PD 0
.IP "all_table_names" 4
.IX Item "all_table_names"
.PD
.Vb 1
\&  @names = $class_obj\->ancestry_table_names
.Ve
.Sp
Returns a list of table names in the class's inheritance hierarchy.
.IP "direct_column_names" 4
.IX Item "direct_column_names"
Returns a list of column names for each direct property meta.  Classes with
data sources and table names will have properties with column names.
.IP "direct_id_column_names" 4
.IX Item "direct_id_column_names"
Returns a list of \s-1ID\s0 column names for each direct property meta.
.IP "direct_columnless_property_names" 4
.IX Item "direct_columnless_property_names"
.PD 0
.IP "direct_columnless_property_metas" 4
.IX Item "direct_columnless_property_metas"
.IP "ancestry_columnless_property_names" 4
.IX Item "ancestry_columnless_property_names"
.IP "ancestry_columnless_property_metas" 4
.IX Item "ancestry_columnless_property_metas"
.IP "all_columnless_property_names" 4
.IX Item "all_columnless_property_names"
.IP "all_columnless_property_metas" 4
.IX Item "all_columnless_property_metas"
.PD
Return lists of property meta objects and their names for properties that
have no column name.
.SH "METHODS"
.IX Header "METHODS"
.IP "property_meta_for_name" 4
.IX Item "property_meta_for_name"
.Vb 1
\&  $property_obj = $class_obj\->property_meta_for_name($property_name);
.Ve
.Sp
Return the UR::Object::Property object in the class's inheritance
hierarchy with the given name.  If the property name has been overridden
somewhere in the hierarchy, then it will return the property object
most specific to the class.
.IP "id_property_sorter" 4
.IX Item "id_property_sorter"
.Vb 2
\&  $subref = $class_obj\->id_property_sorter;
\&  @sorted_objs = sort $subref @unsorted_objs;
.Ve
.Sp
Returns a subroutine reference that can be used to sort object instances of
the class.  The subref is able to handle classes with multiple \s-1ID\s0 
properties, and mixes of numeric and non-numeric data and data types.
.IP "autogenerate_new_object_id" 4
.IX Item "autogenerate_new_object_id"
This method is called whenever new objects of the given class are created
through \f(CW\*(C`ClassName\->create()\*(C'\fR, and not all of their \s-1ID\s0 properties were
specified.  UR::Object::Type has an implementation used by default, but
other classes can override this if they need special handling.
.IP "singular_accessor_name_for_is_many_accessor" 4
.IX Item "singular_accessor_name_for_is_many_accessor"
.Vb 1
\&  $property_name = $class_obj\->singular_accessor_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
For is_many properties, returns the name of the singular accessor.  Usually,
this the singular version of the plural, is_many property's name.  The singular
accessor accepts key/value pairs as arguments, which are used to filter the
results of the is_many accessor.  For example, the singular for the 'cars'
accessor is 'car'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "iterator_accessor_name_for_is_many_accessor" 4
.IX Item "iterator_accessor_name_for_is_many_accessor"
.Vb 1
\&  $iter_name = $class_obj\->iterator_accessor_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the accessor name used to get the UR::Object::Iterator that corresponds
with the is_many accessor.  For example, the iterator for the 'cars' accessor
is 'car_iterator'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "set_accessor_name_for_is_many_accessor" 4
.IX Item "set_accessor_name_for_is_many_accessor"
.Vb 1
\&  $set_name = $class_obj\->set_accessor_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the accessor name used to get the UR::Object::Set that corresponds
with the is_many accessor.  For example, the set for the 'cars' accessor
is 'car_set'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "rule_accessor_name_for_is_many_accessor" 4
.IX Item "rule_accessor_name_for_is_many_accessor"
.Vb 1
\&  $rule_name = $class_obj\->rule_accessor_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the accessor name used to get the UR::BoolExpr that corresponds
with the is_many accessor.  For example, the rule for the 'cars' accessor
is '_\|_car_rule'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "arrayref_accessor_name_for_is_many_accessor" 4
.IX Item "arrayref_accessor_name_for_is_many_accessor"
.Vb 1
\&  $arrayref_name = $class_obj\->arrayref_accessor_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the accessor name used to get the arrayref of objects that corresponds
with the is_many accessor.  For example, the arrayref for the 'cars' accessor
is 'car_arrayref'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "adder_name_for_is_many_accessor" 4
.IX Item "adder_name_for_is_many_accessor"
.Vb 1
\&  $adder_name = $class_obj\->adder_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the method name used to get the adder method that corresponds with
the is_many accessor.  For example, the adder for the 'cars' accessor is
\&'add_car'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.IP "remover_name_for_is_many_accessor" 4
.IX Item "remover_name_for_is_many_accessor"
.Vb 1
\&  $remover_name = $class_obj\->remover_name_for_is_many_accessor($is_many_name);
.Ve
.Sp
Returns the method name used to get the remover method that corresponds with
the is_many accessor.  For example, the adder for the 'cars' accessor is
\&'remove_car'.
.Sp
Returns a false value if the given property name does not exist or is not is_many.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
UR::Object::Property, UR::Object::Iterator, UR::Object::Set,
UR::BoolExpr