gramps/src/gen/lib/person.py

#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000-2007  Donald N. Allingham
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id$

"""
Person object for GRAMPS.
"""

#-------------------------------------------------------------------------
#
# GRAMPS modules
#
#-------------------------------------------------------------------------
from gen.lib.primaryobj import PrimaryObject
from gen.lib.srcbase import SourceBase
from gen.lib.notebase import NoteBase
from gen.lib.mediabase import MediaBase
from gen.lib.attrbase import AttributeBase
from gen.lib.addressbase import AddressBase
from gen.lib.ldsordbase import LdsOrdBase
from gen.lib.urlbase import UrlBase
from gen.lib.name import Name
from gen.lib.eventref import EventRef
from gen.lib.personref import PersonRef
from gen.lib.attrtype import AttributeType
from gen.lib.eventroletype import EventRoleType
from gen.lib.markertype import MarkerType

#-------------------------------------------------------------------------
#
# Person class
#
#-------------------------------------------------------------------------
class Person(SourceBase, NoteBase, AttributeBase, MediaBase,
             AddressBase, UrlBase, LdsOrdBase, PrimaryObject):
    """
    The Person record is the GRAMPS in-memory representation of an
    individual person. It contains all the information related to
    an individual.
    
    Person objects are usually created in one of two ways.

    1. Creating a new person object, which is then initialized and added to 
        the database.
    2. Retrieving an object from the database using the records handle.

    Once a Person object has been modified, it must be committed
    to the database using the database object's commit_person function, 
    or the changes will be lost.

    """
    
    UNKNOWN = 2
    MALE    = 1
    FEMALE  = 0
    
    def __init__(self, data=None):
        """
        Create a new Person instance. 
        
        After initialization, most data items have empty or null values, 
        including the database
        handle.
        """
        PrimaryObject.__init__(self)
        SourceBase.__init__(self)
        NoteBase.__init__(self)
        MediaBase.__init__(self)
        AttributeBase.__init__(self)
        AddressBase.__init__(self)
        UrlBase.__init__(self)
        LdsOrdBase.__init__(self)
        self.primary_name = Name()
        self.marker = MarkerType()
        self.event_ref_list = []
        self.family_list = []
        self.parent_family_list = []
        self.alternate_names = []
        self.person_ref_list = []
        self.gender = Person.UNKNOWN
        self.death_ref_index = -1
        self.birth_ref_index = -1
        if data:
            self.unserialize(data)
        
        # We hold a reference to the GrampsDB so that we can maintain
        # its genderStats.  It doesn't get set here, but from
        # GenderStats.count_person.
        
    def serialize(self):
        """
        Convert the data held in the Person to a Python tuple that
        represents all the data elements. 
        
        This method is used to convert the object into a form that can easily 
        be saved to a database.

        These elements may be primative Python types (string, integers), 
        complex Python types (lists or tuples, or Python objects. If the
        target database cannot handle complex types (such as objectes or
        lists), the database is responsible for converting the data into
        a form that it can use.

        :returns: Returns a python tuple containing the data that should
            be considered persistent.
        :rtype: tuple
        """
        return (
            self.handle,                                         #  0
            self.gramps_id,                                      #  1
            self.gender,                                         #  2
            self.primary_name.serialize(),                       #  3
            [name.serialize() for name in self.alternate_names], #  4
            self.death_ref_index,                                #  5
            self.birth_ref_index,                                #  6
            [er.serialize() for er in self.event_ref_list],      #  7
            self.family_list,                                    #  8
            self.parent_family_list,                             #  9
            MediaBase.serialize(self),                           # 10
            AddressBase.serialize(self),                         # 11
            AttributeBase.serialize(self),                       # 12
            UrlBase.serialize(self),                             # 13
            LdsOrdBase.serialize(self),                          # 14
            SourceBase.serialize(self),                          # 15
            NoteBase.serialize(self),                            # 16
            self.change,                                         # 17
            self.marker.serialize(),                             # 18
            self.private,                                        # 19
            [pr.serialize() for pr in self.person_ref_list]      # 20
            )

    def unserialize(self, data):
        """
        Convert the data held in a tuple created by the serialize method
        back into the data in a Person object.

        :param data: tuple containing the persistent data associated the
            Person object
        :type data: tuple
        """
        (self.handle,             #  0
         self.gramps_id,          #  1
         self.gender,             #  2
         primary_name,            #  3
         alternate_names,         #  4
         self.death_ref_index,    #  5
         self.birth_ref_index,    #  6
         event_ref_list,          #  7
         self.family_list,        #  8
         self.parent_family_list, #  9
         media_list,              # 10
         address_list,            # 11
         attribute_list,          # 12
         urls,                    # 13
         lds_ord_list,            # 14
         source_list,             # 15
         note_list,               # 16
         self.change,             # 17
         marker,                  # 18
         self.private,            # 19
         person_ref_list,         # 20
         ) = data

        self.marker = MarkerType()
        self.marker.unserialize(marker)
        self.primary_name = Name()
        self.primary_name.unserialize(primary_name)
        self.alternate_names = [Name().unserialize(name)
                                for name in alternate_names]
        self.event_ref_list = [EventRef().unserialize(er)
                               for er in event_ref_list]
        self.person_ref_list = [PersonRef().unserialize(pr)
                                for pr in person_ref_list]
        MediaBase.unserialize(self, media_list)
        LdsOrdBase.unserialize(self, lds_ord_list)
        AddressBase.unserialize(self, address_list)
        AttributeBase.unserialize(self, attribute_list)
        UrlBase.unserialize(self, urls)
        SourceBase.unserialize(self, source_list)
        NoteBase.unserialize(self, note_list)
        return self
            
    def _has_handle_reference(self, classname, handle):
        """
        Return True if the object has reference to a given handle of given 
        primary object type.
        
        :param classname: The name of the primary object class.
        :type classname: str
        :param handle: The handle to be checked.
        :type handle: str
        :returns: Returns whether the object has reference to this handle of 
                this object type.
        :rtype: bool
        """
        if classname == 'Event':
            return any(ref.ref == handle for ref in self.event_ref_list)
        elif classname == 'Person':
            return any(ref.ref == handle for ref in self.person_ref_list)
        elif classname == 'Family':
            return any(ref == handle 
                for ref in self.family_list + self.parent_family_list)
        elif classname == 'Place':
            return any(ordinance.place == handle 
                for ordinance in self.lds_ord_list)
        return False

    def _remove_handle_references(self, classname, handle_list):
        if classname == 'Event':
            # Keep a copy of the birth and death references
            birth_ref = self.get_birth_ref()
            death_ref = self.get_death_ref()

            new_list = [ref for ref in self.event_ref_list
                        if ref.ref not in handle_list]
            # If deleting removing the reference to the event
            # to which birth or death ref_index points, unset the index
            if (self.birth_ref_index != -1) \
                   and (self.event_ref_list[self.birth_ref_index].ref
                        in handle_list):
                self.set_birth_ref(None)
            if (self.death_ref_index != -1) \
                   and (self.event_ref_list[self.death_ref_index].ref
                        in handle_list):
                self.set_death_ref(None)
            self.event_ref_list = new_list

            # Reset the indexes after deleting the event from even_ref_list
            if (self.birth_ref_index != -1):
                self.set_birth_ref(birth_ref)
            if (self.death_ref_index != -1):
                self.set_death_ref(death_ref)
        elif classname == 'Person':
            new_list = [ref for ref in self.person_ref_list
                        if ref.ref not in handle_list]
            self.person_ref_list = new_list
        elif classname == 'Family':
            new_list = [ handle for handle in self.family_list
                         if handle not in handle_list ]
            self.family_list = new_list
            new_list = [ handle for handle in self.parent_family_list \
                                        if handle not in handle_list ]
            self.parent_family_list = new_list
        elif classname == 'Place':
            for ordinance in self.lds_ord_list:
                if ordinance.place in handle_list:
                    ordinance.place = None

    def _replace_handle_reference(self, classname, old_handle, new_handle):
        if classname == 'Event':
            handle_list = [ref.ref for ref in self.event_ref_list]
            while old_handle in handle_list:
                ix = handle_list.index(old_handle)
                self.event_ref_list[ix].ref = new_handle
                handle_list[ix] = ''
        elif classname == 'Person':
            handle_list = [ref.ref for ref in self.person_ref_list]
            while old_handle in handle_list:
                ix = handle_list.index(old_handle)
                self.person_ref_list[ix].ref = new_handle
                handle_list[ix] = ''
        elif classname == 'Family':
            while old_handle in self.family_list:
                ix = self.family_list.index(old_handle)
                self.family_list[ix] = new_handle

            while old_handle in self.parent_family_list:
                ix = self.parent_family_list.index(old_handle)
                self.parent_family_list[ix] = new_handle
        elif classname == 'Place':
            handle_list = [ordinance.place for ordinance in self.lds_ord_list]
            while old_handle in handle_list:
                ix = handle_list.index(old_handle)
                self.lds_ord_list[ix].place = new_handle
                handle_list[ix] = ''

    def get_text_data_list(self):
        """
        Return the list of all textual attributes of the object.

        :returns: Returns the list of all textual attributes of the object.
        :rtype: list
        """
        return [self.gramps_id]

    def get_text_data_child_list(self):
        """
        Return the list of child objects that may carry textual data.

        :returns: Returns the list of child objects that may carry textual data.
        :rtype: list
        """
        check_list = self.lds_ord_list
        add_list = [item for item in check_list if item]
        return [self.primary_name] + self.media_list + \
                    self.alternate_names + self.address_list + \
                    self.attribute_list + self.urls + \
                    self.source_list + self.event_ref_list + add_list + \
                    self.person_ref_list

    def get_sourcref_child_list(self):
        """
        Return the list of child secondary objects that may refer sources.

        :returns: Returns the list of child secondary child objects that may 
                refer sources.
        :rtype: list
        """
        return [self.primary_name] + self.media_list + \
                    self.alternate_names + self.address_list + \
                    self.attribute_list + self.lds_ord_list + \
                    self.person_ref_list + self.event_ref_list

    def get_note_child_list(self):
        """
        Return the list of child secondary objects that may refer notes.

        :returns: Returns the list of child secondary child objects that may 
                refer notes.
        :rtype: list
        """
        return [self.primary_name] + self.media_list + \
                    self.alternate_names + self.address_list + \
                    self.attribute_list + self.lds_ord_list + \
                    self.person_ref_list + self.source_list + \
                    self.event_ref_list

    def get_referenced_handles(self):
        """
        Return the list of (classname, handle) tuples for all directly
        referenced primary objects.
        
        :returns: List of (classname, handle) tuples for referenced objects.
        :rtype: list
        """
        return [('Family', handle) for handle in
                (self.family_list + self.parent_family_list)] \
                + self.get_referenced_note_handles()

    def get_handle_referents(self):
        """
        Return the list of child objects which may, directly or through
        their children, reference primary objects.
        
        :returns: Returns the list of objects referencing primary objects.
        :rtype: list
        """
        #don't count double, notes can be found in sourcref
        return self.get_sourcref_child_list() + self.source_list

    def set_primary_name(self, name):
        """
        Set the primary name of the Person to the specified :class:`~gen.lib.name.Name` instance.

        :param name: :class:`~gen.lib.name.Name` to be assigned to the person
        :type name: :class:`~gen.lib.name.Name`
        """
        self.primary_name = name

    def get_primary_name(self):
        """
        Return the :class:`~gen.lib.name.Name` instance marked as the Person's primary name.

        :returns: Returns the primary name
        :rtype: :class:`~gen.lib.name.Name`
        """
        return self.primary_name

    def get_alternate_names(self):
        """
        Return the list of alternate :class:`~gen.lib.name.Name` instances.

        :returns: List of :class:`~gen.lib.name.Name` instances
        :rtype: list
        """
        return self.alternate_names

    def set_alternate_names(self, alt_name_list):
        """
        Change the list of alternate names to the passed list.
         
        :param alt_name_list: List of :class:`~gen.lib.name.Name` instances
        :type alt_name_list: list
        """
        self.alternate_names = alt_name_list

    def add_alternate_name(self, name):
        """
        Add a :class:`~gen.lib.name.Name` instance to the list of alternative names.

        :param name: :class:`~gen.lib.name.Name` to add to the list
        :type name: :class:`~gen.lib.name.Name`
        """
        self.alternate_names.append(name)

    def get_nick_name(self):
        for attr in self.attribute_list:
            if int(attr.type) == AttributeType.NICKNAME:
                return attr.get_value()
        else:
            return u''

    def set_gender(self, gender) :
        """
        Set the gender of the Person.

        :param gender: Assigns the Person's gender to one of the
            following constants::
                Person.MALE
                Person.FEMALE
                Person.UNKNOWN
        :type gender: int
        """
        self.gender = gender

    def get_gender(self) :
        """
        Return the gender of the Person.

        :returns: Returns one of the following constants::
            Person.MALE
            Person.FEMALE
            Person.UNKNOWN
        :rtype: int
        """
        return self.gender

    def set_birth_ref(self, event_ref):
        """
        Assign the birth event to the Person object. 
        
        This is accomplished by assigning the :class:`~gen.lib.eventref.EventRef` of the birth event 
        in the current database.

        :param event_ref: the :class:`~gen.lib.eventref.EventRef` object associated with
            the Person's birth.
        :type event_ref: EventRef
        """
        if event_ref and not isinstance(event_ref, EventRef):
            raise ValueError("Expecting EventRef instance")
        if event_ref is None:
            self.birth_ref_index = -1
            return

        # check whether we already have this ref in the list
        for self.birth_ref_index, ref in enumerate(self.event_ref_list):
            if event_ref.is_equal(ref):
                return    # Note: self.birth_ref_index already set
        else:
            self.event_ref_list.append(event_ref)
            self.birth_ref_index = len(self.event_ref_list)-1

    def set_death_ref(self, event_ref):
        """
        Assign the death event to the Person object. 
        
        This is accomplished by assigning the :class:`~gen.lib.eventref.EventRef` of the death event 
        in the current database.

        :param event_ref: the :class:`~gen.lib.eventref.EventRef` object associated with
            the Person's death.
        :type event_ref: EventRef
        """
        if event_ref and not isinstance(event_ref, EventRef):
            raise ValueError("Expecting EventRef instance")
        if event_ref is None:
            self.death_ref_index = -1
            return
            
        # check whether we already have this ref in the list
        for self.death_ref_index, ref in enumerate(self.event_ref_list):
            if event_ref.is_equal(ref):
                return    # Note: self.death_ref_index already set
        else:
            self.event_ref_list.append(event_ref)
            self.death_ref_index = len(self.event_ref_list)-1

    def get_birth_ref(self):
        """
        Return the :class:`~gen.lib.eventref.EventRef` for Person's birth event. 
        
        This should correspond to an :class:`~gen.lib.event.Event` in the database's :class:`~gen.lib.event.Event` list.

        :returns: Returns the birth :class:`~gen.lib.eventref.EventRef` or None if no birth
            :class:`~gen.lib.event.Event` has been assigned.
        :rtype: EventRef
        """
        
        if 0 <= self.birth_ref_index < len(self.event_ref_list):
            return self.event_ref_list[self.birth_ref_index]
        else:
            return None

    def get_death_ref(self):
        """
        Return the :class:`~gen.lib.eventref.EventRef` for the Person's death event. 
        
        This should correspond to an :class:`~gen.lib.event.Event` in the database's :class:`~gen.lib.event.Event` list.

        :returns: Returns the death :class:`~gen.lib.eventref.EventRef` or None if no death
            :class:`~gen.lib.event.Event` has been assigned.
        :rtype: event_ref
        """
        
        if 0 <= self.death_ref_index < len(self.event_ref_list):
            return self.event_ref_list[self.death_ref_index]
        else:
            return None

    def add_event_ref(self, event_ref):
        """
        Add the :class:`~gen.lib.eventref.EventRef` to the Person instance's :class:`~gen.lib.eventref.EventRef` list.
        
        This is accomplished by assigning the :class:`~gen.lib.eventref.EventRef` of a valid
        :class:`~gen.lib.event.Event` in the current database.
        
        :param event_ref: the :class:`~gen.lib.eventref.EventRef` to be added to the
            Person's :class:`~gen.lib.eventref.EventRef` list.
        :type event_ref: EventRef
        """
        if event_ref and not isinstance(event_ref, EventRef):
            raise ValueError("Expecting EventRef instance")

        # check whether we already have this ref in the list
        if not any(event_ref.is_equal(ref) for ref in self.event_ref_list):
            self.event_ref_list.append(event_ref)

    def get_event_ref_list(self):
        """
        Return the list of :class:`~gen.lib.eventref.EventRef` objects associated with :class:`~gen.lib.event.Event`
        instances.

        :returns: Returns the list of :class:`~gen.lib.eventref.EventRef` objects associated with
            the Person instance.
        :rtype: list
        """
        return self.event_ref_list

    def get_primary_event_ref_list(self):
        """
        Return the list of :class:`~gen.lib.eventref.EventRef` objects associated with :class:`~gen.lib.event.Event`
        instances that have been marked as primary events.

        :returns: Returns generator of :class:`~gen.lib.eventref.EventRef` objects associated with
            the Person instance.
        :rtype: generator
        """
        return (ref for ref in self.event_ref_list
                if ref.get_role() == EventRoleType.PRIMARY
               )

    def set_event_ref_list(self, event_ref_list):
        """
        Set the Person instance's :class:`~gen.lib.eventref.EventRef` list to the passed list.

        :param event_ref_list: List of valid :class:`~gen.lib.eventref.EventRef` objects
        :type event_ref_list: list
        """
        self.event_ref_list = event_ref_list

    def add_family_handle(self, family_handle):
        """
        Add the :class:`~gen.lib.family.Family` handle to the Person instance's :class:`~gen.lib.family.Family` list.
        
        This is accomplished by assigning the handle of a valid :class:`~gen.lib.family.Family`
        in the current database.

        Adding a :class:`~gen.lib.family.Family` handle to a Person does not automatically update
        the corresponding :class:`~gen.lib.family.Family`. The developer is responsible to make
        sure that when a :class:`~gen.lib.family.Family` is added to Person, that the Person is
        assigned to either the father or mother role in the :class:`~gen.lib.family.Family`.
        
        :param family_handle: handle of the :class:`~gen.lib.family.Family` to be added to the
            Person's :class:`~gen.lib.family.Family` list.
        :type family_handle: str
        """
        if family_handle not in self.family_list:
            self.family_list.append(family_handle)

    def set_preferred_family_handle(self, family_handle):
        """
        Set the family_handle specified to be the preferred :class:`~gen.lib.family.Family`.
        
        The preferred :class:`~gen.lib.family.Family` is determined by the first :class:`~gen.lib.family.Family` in the
        :class:`~gen.lib.family.Family` list, and is typically used to indicate the preferred
        :class:`~gen.lib.family.Family` for navigation or reporting.
        
        The family_handle must already be in the list, or the function
        call has no effect.

        :param family_handle: Handle of the :class:`~gen.lib.family.Family` to make the preferred
            :class:`~gen.lib.family.Family`.
        :type family_handle: str
        :returns: True if the call succeeded, False if the family_handle
            was not already in the :class:`~gen.lib.family.Family` list
        :rtype: bool
        """
        if family_handle in self.family_list:
            self.family_list.remove(family_handle)
            self.family_list = [family_handle] + self.family_list
            return True
        else:
            return False

    def get_family_handle_list(self) :
        """
        Return the list of :class:`~gen.lib.family.Family` handles in which the person is a parent 
        or spouse.

        :returns: Returns the list of handles corresponding to the
              :class:`~gen.lib.family.Family` records with which the person 
              is associated.
        :rtype: list
        """
        return self.family_list

    def set_family_handle_list(self, family_list) :
        """
        Assign the passed list to the Person's list of families in which it is 
        a parent or spouse.

        :param family_list: List of :class:`~gen.lib.family.Family` handles to be associated
            with the Person
        :type family_list: list 
        """
        self.family_list = family_list

    def clear_family_handle_list(self):
        """
        Remove all :class:`~gen.lib.family.Family` handles from the :class:`~gen.lib.family.Family` list.
        """
        self.family_list = []

    def remove_family_handle(self, family_handle):
        """
        Remove the specified :class:`~gen.lib.family.Family` handle from the list of 
        marriages/partnerships. 
        
        If the handle does not exist in the list, the operation has no effect.

        :param family_handle: :class:`~gen.lib.family.Family` handle to remove from the list
        :type family_handle: str

        :returns: True if the handle was removed, False if it was not
            in the list.
        :rtype: bool
        """
        if family_handle in self.family_list:
            self.family_list.remove(family_handle)
            return True
        else:
            return False

    def get_parent_family_handle_list(self):
        """
        Return the list of :class:`~gen.lib.family.Family` handles in which the person is a child.

        :returns: Returns the list of handles corresponding to the
            :class:`~gen.lib.family.Family` records with which the person is a child.
        :rtype: list
        """
        return self.parent_family_list

    def set_parent_family_handle_list(self, family_list):
        """
        Return the list of :class:`~gen.lib.family.Family` handles in which the person is a child.

        :returns: Returns the list of handles corresponding to the
            :class:`~gen.lib.family.Family` records with which the person is a child.
        :rtype: list
        """
        self.parent_family_list = family_list

    def add_parent_family_handle(self, family_handle):
        """
        Add the :class:`~gen.lib.family.Family` handle to the Person instance's list of families in 
        which it is a child. 
        
        This is accomplished by assigning the handle of a valid :class:`~gen.lib.family.Family` in 
        the current database.

        Adding a :class:`~gen.lib.family.Family` handle to a Person does not automatically update
        the corresponding :class:`~gen.lib.family.Family`. The developer is responsible to make
        sure that when a :class:`~gen.lib.family.Family` is added to Person, that the Person is
        added to the :class:`~gen.lib.family.Family` instance's child list.
        
        :param family_handle: handle of the :class:`~gen.lib.family.Family` to be added to the
            Person's :class:`~gen.lib.family.Family` list.
        :type family_handle: str
        """
        if not isinstance(family_handle, basestring):
            raise ValueError("expecting handle")
        if family_handle not in self.parent_family_list:
            self.parent_family_list.append(family_handle)

    def clear_parent_family_handle_list(self):
        """
        Remove all :class:`~gen.lib.family.Family` handles from the parent :class:`~gen.lib.family.Family` list.
        """
        self.parent_family_list = []

    def remove_parent_family_handle(self, family_handle):
        """
        Remove the specified :class:`~gen.lib.family.Family` handle from the list of parent
        families (families in which the parent is a child). 
        
        If the handle does not exist in the list, the operation has no effect.

        :param family_handle: :class:`~gen.lib.family.Family` handle to remove from the list
        :type family_handle: str

        :returns: Returns a tuple of three strings, consisting of the
            removed handle, relationship to mother, and relationship
            to father. None is returned if the handle is not in the
            list.
        :rtype: tuple
        """
        if family_handle in self.parent_family_list:
            self.parent_family_list.remove(family_handle)
            return True
        else:
            return False

    def set_main_parent_family_handle(self, family_handle):
        """
        Set the main :class:`~gen.lib.family.Family` in which the Person is a child. 
        
        The main :class:`~gen.lib.family.Family` is the :class:`~gen.lib.family.Family` typically used for reports and
        navigation. This is accomplished by moving the :class:`~gen.lib.family.Family` to the 
        beginning of the list. The family_handle must be in the list for this 
        to have any effect.

        :param family_handle: handle of the :class:`~gen.lib.family.Family` to be marked
            as the main :class:`~gen.lib.family.Family`
        :type family_handle: str
        :returns: Returns True if the assignment has successful
        :rtype: bool
        """
        if family_handle in self.parent_family_list:
            self.parent_family_list.remove(family_handle)
            self.parent_family_list = [family_handle] + self.parent_family_list
            return True
        else:
            return False
        
    def get_main_parents_family_handle(self):
        """
        Return the handle of the :class:`~gen.lib.family.Family` considered to be the main :class:`~gen.lib.family.Family` 
        in which the Person is a child.

        :returns: Returns the family_handle if a family_handle exists, 
            If no :class:`~gen.lib.family.Family` is assigned, None is returned
        :rtype: str
        """
        if self.parent_family_list:
            return self.parent_family_list[0]
        else:
            return None

    def add_person_ref(self, person_ref):
        """
        Add the :class:`~gen.lib.personref.PersonRef` to the Person instance's :class:`~gen.lib.personref.PersonRef` list.
        
        :param person_ref: the :class:`~gen.lib.personref.PersonRef` to be added to the
            Person's :class:`~gen.lib.personref.PersonRef` list.
        :type person_ref: PersonRef
        """
        if person_ref and not isinstance(person_ref, PersonRef):
            raise ValueError("Expecting PersonRef instance")
        self.person_ref_list.append(person_ref)

    def get_person_ref_list(self):
        """
        Return the list of :class:`~gen.lib.personref.PersonRef` objects.

        :returns: Returns the list of :class:`~gen.lib.personref.PersonRef` objects.
        :rtype: list
        """
        return self.person_ref_list

    def set_person_ref_list(self, person_ref_list):
        """
        Set the Person instance's :class:`~gen.lib.personref.PersonRef` list to the passed list.

        :param person_ref_list: List of valid :class:`~gen.lib.personref.PersonRef` objects
        :type person_ref_list: list
        """
        self.person_ref_list = person_ref_list