Examples

Models used in Unit Tests

# encoding: utf-8

# This file is part of py-serializable
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
# Copyright (c) Paul Horton. All Rights Reserved.

import re
from datetime import date
from decimal import Decimal
from enum import Enum, unique
from typing import Any, Dict, Iterable, List, Optional, Set, Type
from uuid import UUID, uuid4

import py_serializable
from py_serializable import ViewType, XmlArraySerializationType, XmlStringSerializationType
from py_serializable.helpers import BaseHelper, Iso8601Date

"""
Model classes used in unit tests and examples.
"""


class SchemaVersion1(ViewType):
    pass


class SchemaVersion2(ViewType):
    pass


class SchemaVersion3(ViewType):
    pass


class SchemaVersion4(ViewType):
    pass


SCHEMAVERSION_MAP: Dict[int, Type[ViewType]] = {
    1: SchemaVersion1,
    2: SchemaVersion2,
    3: SchemaVersion3,
    4: SchemaVersion4,
}


class ReferenceReferences(BaseHelper):

    @classmethod
    def serialize(cls, o: Any) -> Set[str]:
        if isinstance(o, set):
            return set(map(lambda i: str(i.ref), o))

        raise ValueError(f'Attempt to serialize a non-set: {o.__class__}')

    @classmethod
    def deserialize(cls, o: Any) -> Set['BookReference']:
        print(f'Deserializing {o} ({type(o)})')
        references: Set['BookReference'] = set()
        if isinstance(o, list):
            for v in o:
                references.add(BookReference(ref=v))
            return references

        raise ValueError(f'Attempt to deserialize a non-set: {o.__class__}')


class TitleMapper(BaseHelper):

    @classmethod
    def json_serialize(cls, o: str) -> str:
        return f'{{J}} {o}'

    @classmethod
    def json_deserialize(cls, o: str) -> str:
        return re.sub(r'^\{J} ', '', o)

    @classmethod
    def xml_serialize(cls, o: str) -> str:
        return f'{{X}} {o}'

    @classmethod
    def xml_deserialize(cls, o: str) -> str:
        return re.sub(r'^\{X} ', '', o)


class BookEditionHelper(BaseHelper):

    @classmethod
    def serialize(cls, o: Any) -> Optional[int]:
        return o \
            if isinstance(o, int) and o > 0 \
            else None

    @classmethod
    def deserialize(cls, o: Any) -> int:
        try:
            return int(o)
        except Exception:
            return 1


@py_serializable.serializable_class
class Chapter:

    def __init__(self, *, number: int, title: str) -> None:
        self._number = number
        self._title = title

    @property
    def number(self) -> int:
        return self._number

    @property
    @py_serializable.xml_string(XmlStringSerializationType.TOKEN)
    def title(self) -> str:
        return self._title

    def __eq__(self, other: Any) -> bool:
        if isinstance(other, Chapter):
            return hash(other) == hash(self)
        return False

    def __hash__(self) -> int:
        return hash((self.number, self.title))


@py_serializable.serializable_class
class Publisher:

    def __init__(self, *, name: str, address: Optional[str] = None, email: Optional[str] = None) -> None:
        self._name = name
        self._address = address
        self._email = email

    @property
    def name(self) -> str:
        return self._name

    @property
    @py_serializable.view(SchemaVersion2)
    @py_serializable.view(SchemaVersion4)
    def address(self) -> Optional[str]:
        return self._address

    @property
    @py_serializable.include_none(SchemaVersion2)
    @py_serializable.include_none(SchemaVersion3, 'RUBBISH')
    def email(self) -> Optional[str]:
        return self._email

    def __eq__(self, other: object) -> bool:
        if isinstance(other, Publisher):
            return hash(other) == hash(self)
        return False

    def __hash__(self) -> int:
        return hash((self.name, self.address, self.email))


@unique
class BookType(Enum):
    FICTION = 'fiction'
    NON_FICTION = 'non-fiction'


@py_serializable.serializable_class(name='edition')
class BookEdition:

    def __init__(self, *, number: int, name: str) -> None:
        self._number = number
        self._name = name

    @property
    @py_serializable.xml_attribute()
    @py_serializable.type_mapping(BookEditionHelper)
    def number(self) -> int:
        return self._number

    @property
    @py_serializable.xml_name('.')
    def name(self) -> str:
        return self._name

    def __eq__(self, other: object) -> bool:
        if isinstance(other, BookEdition):
            return hash(other) == hash(self)
        return False

    def __hash__(self) -> int:
        return hash((self.number, self.name))


@py_serializable.serializable_class
class BookReference:

    def __init__(self, *, ref: str, references: Optional[Iterable['BookReference']] = None) -> None:
        self.ref = ref
        self.references = set(references or {})

    @property
    @py_serializable.json_name('reference')
    @py_serializable.xml_attribute()
    @py_serializable.xml_string(XmlStringSerializationType.TOKEN)
    def ref(self) -> str:
        return self._ref

    @ref.setter
    def ref(self, ref: str) -> None:
        self._ref = ref

    @property
    @py_serializable.json_name('refersTo')
    @py_serializable.type_mapping(ReferenceReferences)
    @py_serializable.xml_array(py_serializable.XmlArraySerializationType.FLAT, 'reference')
    def references(self) -> Set['BookReference']:
        return self._references

    @references.setter
    def references(self, references: Iterable['BookReference']) -> None:
        self._references = set(references)

    def __eq__(self, other: object) -> bool:
        if isinstance(other, BookReference):
            return hash(other) == hash(self)
        return False

    def __hash__(self) -> int:
        return hash((self.ref, tuple(self.references)))

    def __repr__(self) -> str:
        return f'<BookReference ref={self.ref}, targets={len(self.references)}>'


@py_serializable.serializable_class
class StockId(py_serializable.helpers.BaseHelper):

    def __init__(self, id: str) -> None:
        self._id = id

    @property
    @py_serializable.json_name('.')
    @py_serializable.xml_name('.')
    def id(self) -> str:
        return self._id

    @classmethod
    def serialize(cls, o: Any) -> str:
        if isinstance(o, StockId):
            return str(o)
        raise Exception(
            f'Attempt to serialize a non-StockId: {o!r}')

    @classmethod
    def deserialize(cls, o: Any) -> 'StockId':
        try:
            return StockId(id=str(o))
        except ValueError as err:
            raise Exception(
                f'StockId string supplied does not parse: {o!r}'
            ) from err

    def __eq__(self, other: Any) -> bool:
        if isinstance(other, StockId):
            return hash(other) == hash(self)
        return False

    def __lt__(self, other: Any) -> bool:
        if isinstance(other, StockId):
            return self._id < other._id
        return NotImplemented

    def __hash__(self) -> int:
        return hash(self._id)

    def __repr__(self) -> str:
        return f'<StockId {self._id}>'

    def __str__(self) -> str:
        return self._id


@py_serializable.serializable_class(name='bigbook',
                                    ignore_during_deserialization=['something_to_be_ignored', 'ignore_me', 'ignored'])
class Book:

    def __init__(self, title: str, isbn: str, publish_date: date, authors: Iterable[str],
                 publisher: Optional[Publisher] = None, chapters: Optional[Iterable[Chapter]] = None,
                 edition: Optional[BookEdition] = None, type: BookType = BookType.FICTION,
                 id: Optional[UUID] = None, references: Optional[Iterable[BookReference]] = None,
                 rating: Optional[Decimal] = None, stock_ids: Optional[Iterable[StockId]] = None) -> None:
        self._id = id or uuid4()
        self._title = title
        self._isbn = isbn
        self._edition = edition
        self._publish_date = publish_date
        self._authors = set(authors)
        self._publisher = publisher
        self.chapters = list(chapters or [])
        self._type = type
        self.references = set(references or [])
        self.rating = Decimal('NaN') if rating is None else rating
        self._stock_ids = set(stock_ids or [])

    @property
    @py_serializable.xml_sequence(1)
    def id(self) -> UUID:
        return self._id

    @property
    @py_serializable.xml_sequence(2)
    @py_serializable.type_mapping(TitleMapper)
    @py_serializable.xml_string(XmlStringSerializationType.TOKEN)
    def title(self) -> str:
        return self._title

    @property
    @py_serializable.json_name('isbn_number')
    @py_serializable.xml_attribute()
    @py_serializable.xml_name('isbn_number')
    def isbn(self) -> str:
        return self._isbn

    @property
    @py_serializable.xml_sequence(3)
    def edition(self) -> Optional[BookEdition]:
        return self._edition

    @property
    @py_serializable.xml_sequence(4)
    @py_serializable.type_mapping(Iso8601Date)
    def publish_date(self) -> date:
        return self._publish_date

    @property
    @py_serializable.xml_array(XmlArraySerializationType.FLAT, 'author')
    @py_serializable.xml_string(XmlStringSerializationType.NORMALIZED_STRING)
    @py_serializable.xml_sequence(5)
    def authors(self) -> Set[str]:
        return self._authors

    @property
    @py_serializable.xml_sequence(7)
    def publisher(self) -> Optional[Publisher]:
        return self._publisher

    @property
    @py_serializable.xml_array(XmlArraySerializationType.NESTED, 'chapter')
    @py_serializable.xml_sequence(8)
    def chapters(self) -> List[Chapter]:
        return self._chapters

    @chapters.setter
    def chapters(self, chapters: Iterable[Chapter]) -> None:
        self._chapters = list(chapters)

    @property
    @py_serializable.xml_sequence(6)
    def type(self) -> BookType:
        return self._type

    @property
    @py_serializable.view(SchemaVersion4)
    @py_serializable.xml_array(py_serializable.XmlArraySerializationType.NESTED, 'reference')
    @py_serializable.xml_sequence(7)
    def references(self) -> Set[BookReference]:
        return self._references

    @references.setter
    def references(self, references: Iterable[BookReference]) -> None:
        self._references = set(references)

    @property
    @py_serializable.xml_sequence(20)
    def rating(self) -> Decimal:
        return self._rating

    @rating.setter
    def rating(self, rating: Decimal) -> None:
        self._rating = rating

    @property
    @py_serializable.view(SchemaVersion4)
    @py_serializable.xml_array(XmlArraySerializationType.FLAT, 'stockId')
    @py_serializable.xml_sequence(21)
    def stock_ids(self) -> Set[StockId]:
        return self._stock_ids


# region ThePhoenixProject_v2


ThePhoenixProject_v1 = Book(
    title='The Phoenix Project',
    isbn='978-1942788294',
    publish_date=date(year=2018, month=4, day=16),
    authors=['Gene Kim', 'Kevin Behr', 'George Spafford'],
    publisher=Publisher(name='IT Revolution Press LLC'),
    edition=BookEdition(number=5, name='5th Anniversary Limited Edition'),
    id=UUID('f3758bf0-0ff7-4366-a5e5-c209d4352b2d'),
    rating=Decimal('9.8')
)

ThePhoenixProject_v1.chapters.append(Chapter(number=1, title='Tuesday, September 2'))
ThePhoenixProject_v1.chapters.append(Chapter(number=2, title='Tuesday, September 2'))
ThePhoenixProject_v1.chapters.append(Chapter(number=3, title='Tuesday, September 2'))
ThePhoenixProject_v1.chapters.append(Chapter(number=4, title='Wednesday, September 3'))

# endregion ThePhoenixProject_v2

# region ThePhoenixProject_v2

ThePhoenixProject_v2 = Book(
    title='The Phoenix Project',
    isbn='978-1942788294',
    publish_date=date(year=2018, month=4, day=16),
    authors=['Gene Kim', 'Kevin Behr', 'George Spafford'],
    publisher=Publisher(name='IT Revolution Press LLC', address='10 Downing Street'),
    edition=BookEdition(number=5, name='5th Anniversary Limited Edition'),
    id=UUID('f3758bf0-0ff7-4366-a5e5-c209d4352b2d'),
    rating=Decimal('9.8'),
    stock_ids=[StockId('stock-id-1'), StockId('stock-id-2')]
)

ThePhoenixProject_v2.chapters.append(Chapter(number=1, title='Tuesday, September 2'))
ThePhoenixProject_v2.chapters.append(Chapter(number=2, title='Tuesday, September 2'))
ThePhoenixProject_v2.chapters.append(Chapter(number=3, title='Tuesday, September 2'))
ThePhoenixProject_v2.chapters.append(Chapter(number=4, title='Wednesday, September 3'))

SubRef1 = BookReference(ref='sub-ref-1')
SubRef2 = BookReference(ref='sub-ref-2')
SubRef3 = BookReference(ref='sub-ref-3')

Ref1 = BookReference(ref='my-ref-1')
Ref2 = BookReference(ref='my-ref-2', references=[SubRef1, SubRef3])
Ref3 = BookReference(ref='my-ref-3', references=[SubRef2])

ThePhoenixProject_v2.references = {Ref3, Ref2, Ref1}

# endregion ThePhoenixProject_v2

ThePhoenixProject = ThePhoenixProject_v2

# region ThePhoenixProject_unnormalized

# a case where the `normalizedString` and `token` transformation must come into play
ThePhoenixProject_unnormalized = Book(
    title='The \n Phoenix Project  ',
    isbn='978-1942788294',
    publish_date=date(year=2018, month=4, day=16),
    authors=['Gene Kim', 'Kevin\r\nBehr', 'George\tSpafford'],
    publisher=Publisher(name='IT Revolution Press LLC', address='10 Downing Street'),
    edition=BookEdition(number=5, name='5th Anniversary Limited Edition'),
    id=UUID('f3758bf0-0ff7-4366-a5e5-c209d4352b2d'),
    rating=Decimal('9.8'),
    stock_ids=[StockId('stock-id-1'), StockId('stock-id-2')]
)

ThePhoenixProject_unnormalized.chapters.append(Chapter(number=1, title='Tuesday, September 2'))
ThePhoenixProject_unnormalized.chapters.append(Chapter(number=2, title='Tuesday,\tSeptember 2'))
ThePhoenixProject_unnormalized.chapters.append(Chapter(number=3, title='Tuesday,\r\nSeptember 2'))
ThePhoenixProject_unnormalized.chapters.append(Chapter(number=4, title='Wednesday,\rSeptember\n3'))

SubRef1 = BookReference(ref='  sub-ref-1  ')
SubRef2 = BookReference(ref='\rsub-ref-2\t')
SubRef3 = BookReference(ref='\nsub-ref-3\r\n')

Ref1 = BookReference(ref='\r\nmy-ref-1')
Ref2 = BookReference(ref='\tmy-ref-2', references=[SubRef1, SubRef3])
Ref3 = BookReference(ref='   my-ref-3\n', references=[SubRef2])

ThePhoenixProject_unnormalized.references = {Ref3, Ref2, Ref1}

# endregion ThePhoenixProject_unnormalized

# region ThePhoenixProject_attr_serialized_none

# a case where an attribute is serialized to `None` and deserialized from it
ThePhoenixProject_attr_serialized_none = Book(
    title='The Phoenix Project',
    isbn='978-1942788294',
    publish_date=date(year=2018, month=4, day=16),
    authors=['Gene Kim', 'Kevin Behr', 'George Spafford'],
    publisher=Publisher(name='IT Revolution Press LLC'),
    edition=BookEdition(number=0, name='Preview Edition'),
    id=UUID('f3758bf0-0ff7-4366-a5e5-c209d4352b2d'),
    rating=Decimal('9.8')
)

# endregion ThePhoenixProject_attr_serialized_none

if __name__ == '__main__':
    tpp_as_xml = ThePhoenixProject.as_xml()  # type:ignore[attr-defined]
    tpp_as_json = ThePhoenixProject.as_json()  # type:ignore[attr-defined]
    print(tpp_as_xml, tpp_as_json, sep='\n\n')

    import io
    import json

    tpp_from_xml = ThePhoenixProject.from_xml(  # type:ignore[attr-defined]
        io.StringIO(tpp_as_xml))
    tpp_from_json = ThePhoenixProject.from_json(  # type:ignore[attr-defined]
        json.loads(tpp_as_json))

Logging and log access

This library utilizes an own instance of Logger, which you may access and add handlers to.

Example: send all logs messages to stdErr

import sys
import logging
import py_serializable

my_log_handler = logging.StreamHandler(sys.stderr)
my_log_handler.setLevel(logging.DEBUG)
my_log_handler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
py_serializable.logger.addHandler(my_log_handler)
py_serializable.logger.setLevel(my_log_handler.level)
py_serializable.logger.propagate = False

@py_serializable.serializable_class
class Chapter:

   def __init__(self, *, number: int, title: str) -> None:
     self._number = number
     self._title = title

   @property
   def number(self) -> int:
     return self._number

   @property
   def title(self) -> str:
     return self._title


moby_dick_c1 = Chapter(number=1, title='Loomings')
print(moby_dick_c1.as_json())