Merge pull request #44 from Juanlu001/attrs

Use attrs everywhere

src/czml3/base.py

@@ -3,7 +3,8 @@
 import warnings
 from enum import Enum
 from json import JSONEncoder
-from typing import List
+
+import attr
 
 from .constants import ISO8601_FORMAT_Z
 
@@ -24,9 +25,8 @@ def default(self, o):
         return super().default(o)
 
 
+@attr.s(repr=False, frozen=True)
 class BaseCZMLObject:
-    KNOWN_PROPERTIES = []  # type: List[str]
-
     def __repr__(self):
         return self.dumps(indent=4)
 
@@ -45,7 +45,7 @@ def to_json(self):
         if getattr(self, "delete", False):
             properties_list = NON_DELETE_PROPERTIES
         else:
-            properties_list = self.KNOWN_PROPERTIES
+            properties_list = list(attr.asdict(self).keys())
 
         obj_dict = {}
         for property_name in properties_list:

src/czml3/common.py

@@ -7,21 +7,7 @@
 class Deletable:
     """A property whose value may be deleted."""
 
-    _delete: bool
-
-    @property
-    def delete(self):
-        """
-        Whether the client should delete existing samples or interval data for this property.
-
-        Data will be deleted for the containing interval,
-        or if there is no containing interval,
-        then all data.
-        If true,
-        all other properties in this property
-        will be ignored.
-        """
-        return self._delete
+    delete: bool
 
 
 # noinspection PyPep8Naming
@@ -31,49 +17,14 @@ class Interpolatable:
     The interpolation happens over provided time-tagged samples.
     """
 
-    _epoch: dt.datetime
-    _interpolation_algorithm: InterpolationAlgorithms
-    _interpolation_degree: int
-
-    @property
-    def epoch(self):
-        """The epoch to use for times specified as seconds since an epoch."""
-        return self._epoch
-
-    @property
-    def interpolationAlgorithm(self):
-        """The interpolation algorithm to use when interpolating."""
-        return self._interpolation_algorithm
-
-    @property
-    def interpolationDegree(self):
-        """The degree of interpolation to use when interpolating."""
-        return self._interpolation_degree
+    epoch: dt.datetime
+    interpolation_algorithm: InterpolationAlgorithms
+    interpolation_degree: int
 
 
 # noinspection PyPep8Naming
 class HasAlignment:
     """A property that can be horizontally or vertically aligned."""
 
-    _horizontal_origin: HorizontalOrigins
-    _vertical_origin: VerticalOrigins
-
-    @property
-    def horizontalOrigin(self):
-        """The horizontal origin of the object.
-
-        It controls whether the object is
-        left-, center-, or right-aligned with the position.
-
-        """
-        return self._horizontal_origin
-
-    @property
-    def verticalOrigin(self):
-        """The vertical origin of the object.
-
-        Determines whether the object is
-        bottom-, center-, or top-aligned with the position.
-
-        """
-        return self._vertical_origin
+    horizontal_origin: HorizontalOrigins
+    vertical_origin: VerticalOrigins