Define new error class and update code and tests

Define the new `TreeMeshNotFinalizedError` class. Update the properties
to not pass the `is_property` argument to the error method. Update the
tests accordingly.

discretize/_extensions/tree_ext.pyx

@@ -15,6 +15,9 @@ import scipy.sparse as sp
 import numpy as np
 from .interputils_cython cimport _bisect_left, _bisect_right
 
+class TreeMeshNotFinalizedError(RuntimeError):
+    """Raise when a TreeMesh is not finalized."""
+
 
 cdef class TreeCell:
     """A class for defining cells within instances of :class:`~discretize.TreeMesh`.
@@ -1959,7 +1962,7 @@ cdef class _TreeMesh:
         (n_cells, dim) numpy.ndarray of float
             Gridded cell center locations
         """
-        self._error_if_not_finalized("cell_centers", is_property=True)
+        self._error_if_not_finalized("cell_centers")
         cdef np.float64_t[:, :] gridCC
         cdef np.int64_t ii, ind, dim
         if self._cell_centers is None:
@@ -1985,7 +1988,7 @@ cdef class _TreeMesh:
         (n_nodes, dim) numpy.ndarray of float
             Gridded non-hanging node locations
         """
-        self._error_if_not_finalized("nodes", is_property=True)
+        self._error_if_not_finalized("nodes")
         cdef np.float64_t[:, :] gridN
         cdef Node *node
         cdef np.int64_t ii, ind, dim
@@ -2014,7 +2017,7 @@ cdef class _TreeMesh:
         (n_hanging_nodes, dim) numpy.ndarray of float
             Gridded hanging node locations
         """
-        self._error_if_not_finalized("hanging_nodes", is_property=True)
+        self._error_if_not_finalized("hanging_nodes")
         cdef np.float64_t[:, :] gridN
         cdef Node *node
         cdef np.int64_t ii, ind, dim
@@ -2041,7 +2044,7 @@ cdef class _TreeMesh:
         (n_boundary_nodes, dim) numpy.ndarray of float
             Gridded boundary node locations
         """
-        self._error_if_not_finalized("boundary_nodes", is_property=True)
+        self._error_if_not_finalized("boundary_nodes")
         nodes = self.nodes
         x0, xF = self._xs[0], self._xs[-1]
         y0, yF = self._ys[0], self._ys[-1]
@@ -2073,7 +2076,7 @@ cdef class _TreeMesh:
         (n_cells, dim) numpy.ndarray of float
             Gridded cell dimensions
         """
-        self._error_if_not_finalized("h_gridded", is_property=True)
+        self._error_if_not_finalized("h_gridded")
         if self._h_gridded is not None:
             return self._h_gridded
         cdef np.float64_t[:, :] gridCH
@@ -2102,7 +2105,7 @@ cdef class _TreeMesh:
         (n_edges_x, dim) numpy.ndarray of float
             Gridded locations of all non-hanging x-edges
         """
-        self._error_if_not_finalized("edges_x", is_property=True)
+        self._error_if_not_finalized("edges_x")
         cdef np.float64_t[:, :] gridEx
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2130,7 +2133,7 @@ cdef class _TreeMesh:
         (n_hanging_edges_x, dim) numpy.ndarray of float
             Gridded locations of all hanging x-edges
         """
-        self._error_if_not_finalized("hanging_edges_x", is_property=True)
+        self._error_if_not_finalized("hanging_edges_x")
         cdef np.float64_t[:, :] gridhEx
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2156,7 +2159,7 @@ cdef class _TreeMesh:
         (n_edges_y, dim) numpy.ndarray of float
             Gridded locations of all non-hanging y-edges
         """
-        self._error_if_not_finalized("edges_y", is_property=True)
+        self._error_if_not_finalized("edges_y")
         cdef np.float64_t[:, :] gridEy
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2184,7 +2187,7 @@ cdef class _TreeMesh:
         (n_haning_edges_y, dim) numpy.ndarray of float
             Gridded locations of all hanging y-edges
         """
-        self._error_if_not_finalized("hanging_edges_y", is_property=True)
+        self._error_if_not_finalized("hanging_edges_y")
         cdef np.float64_t[:, :] gridhEy
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2210,7 +2213,7 @@ cdef class _TreeMesh:
         (n_edges_z, dim) numpy.ndarray of float
             Gridded locations of all non-hanging z-edges
         """
-        self._error_if_not_finalized("edges_z", is_property=True)
+        self._error_if_not_finalized("edges_z")
         cdef np.float64_t[:, :] gridEz
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2238,7 +2241,7 @@ cdef class _TreeMesh:
         (n_hanging_edges_z, dim) numpy.ndarray of float
             Gridded locations of all hanging z-edges
         """
-        self._error_if_not_finalized("hanging_edges_z", is_property=True)
+        self._error_if_not_finalized("hanging_edges_z")
         cdef np.float64_t[:, :] gridhEz
         cdef Edge *edge
         cdef np.int64_t ii, ind, dim
@@ -2266,7 +2269,7 @@ cdef class _TreeMesh:
         (n_boundary_edges, dim) numpy.ndarray of float
             Gridded boundary edge locations
         """
-        self._error_if_not_finalized("boundary_edges", is_property=True)
+        self._error_if_not_finalized("boundary_edges")
         edges_x = self.edges_x
         edges_y = self.edges_y
         x0, xF = self._xs[0], self._xs[-1]
@@ -2306,7 +2309,7 @@ cdef class _TreeMesh:
         (n_faces_x, dim) numpy.ndarray of float
             Gridded locations of all non-hanging x-faces
         """
-        self._error_if_not_finalized("faces_x", is_property=True)
+        self._error_if_not_finalized("faces_x")
         if(self._dim == 2): return self.edges_y
 
         cdef np.float64_t[:, :] gridFx
@@ -2336,7 +2339,7 @@ cdef class _TreeMesh:
         (n_faces_y, dim) numpy.ndarray of float
             Gridded locations of all non-hanging y-faces
         """
-        self._error_if_not_finalized("faces_y", is_property=True)
+        self._error_if_not_finalized("faces_y")
         if(self._dim == 2): return self.edges_x
         cdef np.float64_t[:, :] gridFy
         cdef Face *face
@@ -2365,7 +2368,7 @@ cdef class _TreeMesh:
         (n_faces_z, dim) numpy.ndarray of float
             Gridded locations of all non-hanging z-faces
         """
-        self._error_if_not_finalized("faces_z", is_property=True)
+        self._error_if_not_finalized("faces_z")
         if(self._dim == 2): return self.cell_centers
 
         cdef np.float64_t[:, :] gridFz
@@ -2395,7 +2398,7 @@ cdef class _TreeMesh:
         (n_hanging_faces_x, dim) numpy.ndarray of float
             Gridded locations of all hanging x-faces
         """
-        self._error_if_not_finalized("hanging_faces_x", is_property=True)
+        self._error_if_not_finalized("hanging_faces_x")
         if(self._dim == 2): return self.hanging_edges_y
 
         cdef np.float64_t[:, :] gridFx
@@ -2423,7 +2426,7 @@ cdef class _TreeMesh:
         (n_hanging_faces_y, dim) numpy.ndarray of float
             Gridded locations of all hanging y-faces
         """
-        self._error_if_not_finalized("hanging_faces_y", is_property=True)
+        self._error_if_not_finalized("hanging_faces_y")
         if(self._dim == 2): return self.hanging_edges_x
 
         cdef np.float64_t[:, :] gridhFy
@@ -2451,7 +2454,7 @@ cdef class _TreeMesh:
         (n_hanging_faces_z, dim) numpy.ndarray of float
             Gridded locations of all hanging z-faces
         """
-        self._error_if_not_finalized("hanging_faces_z", is_property=True)
+        self._error_if_not_finalized("hanging_faces_z")
         if(self._dim == 2): return np.array([])
 
         cdef np.float64_t[:, :] gridhFz
@@ -2481,7 +2484,7 @@ cdef class _TreeMesh:
         (n_boundary_faces, dim) numpy.ndarray of float
             Gridded boundary face locations
         """
-        self._error_if_not_finalized("boundary_faces", is_property=True)
+        self._error_if_not_finalized("boundary_faces")
         faces_x = self.faces_x
         faces_y = self.faces_y
         x0, xF = self._xs[0], self._xs[-1]
@@ -2511,7 +2514,7 @@ cdef class _TreeMesh:
         (n_boundary_faces, dim) numpy.ndarray of float
             Outward normals of boundary faces
         """
-        self._error_if_not_finalized("boundary_face_outward_normals", is_property=True)
+        self._error_if_not_finalized("boundary_face_outward_normals")
         faces_x = self.faces_x
         faces_y = self.faces_y
         x0, xF = self._xs[0], self._xs[-1]
@@ -2554,7 +2557,7 @@ cdef class _TreeMesh:
               - *3D:* Returns the cell volumes
 
         """
-        self._error_if_not_finalized("cell_volumes", is_property=True)
+        self._error_if_not_finalized("cell_volumes")
         cdef np.float64_t[:] vol
         if self._cell_volumes is None:
             self._cell_volumes = np.empty(self.n_cells, dtype=np.float64)
@@ -2579,7 +2582,7 @@ cdef class _TreeMesh:
               respectively
             - *3D:* returns the x, y and z-face areas in order
         """
-        self._error_if_not_finalized("face_areas", is_property=True)
+        self._error_if_not_finalized("face_areas")
         if self._dim == 2 and self._face_areas is None:
             self._face_areas = np.r_[self.edge_lengths[self.n_edges_x:], self.edge_lengths[:self.n_edges_x]]
         cdef np.float64_t[:] area
@@ -2622,7 +2625,7 @@ cdef class _TreeMesh:
             - *2D:* returns the x-edge and y-edge lengths in order
             - *3D:* returns the x, y and z-edge lengths in order
         """
-        self._error_if_not_finalized("edge_lengths", is_property=True)
+        self._error_if_not_finalized("edge_lengths")
         cdef np.float64_t[:] edge_l
         cdef Edge *edge
         cdef int_t ind, offset
@@ -3587,7 +3590,7 @@ cdef class _TreeMesh:
         (n_total_faces_x, n_cells) scipy.sparse.csr_matrix
             The stencil for the x-component of the cell gradient
         """
-        self._error_if_not_finalized("stencil_cell_gradient_x", is_property=True)
+        self._error_if_not_finalized("stencil_cell_gradient_x")
         if getattr(self, '_stencil_cell_gradient_x', None) is not None:
             return self._stencil_cell_gradient_x
         cdef np.int64_t[:] I = np.zeros(2*self.n_total_faces_x, dtype=np.int64)
@@ -3665,7 +3668,7 @@ cdef class _TreeMesh:
         (n_total_faces_y, n_cells) scipy.sparse.csr_matrix
             The stencil for the y-component of the cell gradient
         """
-        self._error_if_not_finalized("stencil_cell_gradient_y", is_property=True)
+        self._error_if_not_finalized("stencil_cell_gradient_y")
         if getattr(self, '_stencil_cell_gradient_y', None) is not None:
             return self._stencil_cell_gradient_y
 
@@ -3744,7 +3747,7 @@ cdef class _TreeMesh:
         (n_total_faces_z, n_cells) scipy.sparse.csr_matrix
             The stencil for the z-component of the cell gradient
         """
-        self._error_if_not_finalized("stencil_cell_gradient_z", is_property=True)
+        self._error_if_not_finalized("stencil_cell_gradient_z")
         if getattr(self, '_stencil_cell_gradient_z', None) is not None:
             return self._stencil_cell_gradient_z
 
@@ -5045,7 +5048,7 @@ cdef class _TreeMesh:
 
             phi_f = Acf @ phi_c
         """
-        self._error_if_not_finalized("average_cell_to_face", is_property=True)
+        self._error_if_not_finalized("average_cell_to_face")
         if self._average_cell_to_face is not None:
             return self._average_cell_to_face
         stacks = [self.average_cell_to_face_x, self.average_cell_to_face_y]
@@ -5106,7 +5109,7 @@ cdef class _TreeMesh:
         in the x-direction. For boundary faces, nearest neighbor is used to extrapolate
         the values.
         """
-        self._error_if_not_finalized("average_cell_vector_to_face", is_property=True)
+        self._error_if_not_finalized("average_cell_vector_to_face")
         if self._average_cell_vector_to_face is not None:
             return self._average_cell_vector_to_face
         stacks = [self.average_cell_to_face_x, self.average_cell_to_face_y]
@@ -5130,7 +5133,7 @@ cdef class _TreeMesh:
         (n_faces_x, n_cells) scipy.sparse.csr_matrix
             The scalar averaging operator from cell centers to x faces
         """
-        self._error_if_not_finalized("average_cell_to_face_x", is_property=True)
+        self._error_if_not_finalized("average_cell_to_face_x")
         if self._average_cell_to_face_x is not None:
             return self._average_cell_to_face_x
         cdef np.int64_t[:] I = np.zeros(2*self.n_total_faces_x, dtype=np.int64)
@@ -5247,7 +5250,7 @@ cdef class _TreeMesh:
         (n_faces_y, n_cells) scipy.sparse.csr_matrix
             The scalar averaging operator from cell centers to y faces
         """
-        self._error_if_not_finalized("average_cell_to_face_y", is_property=True)
+        self._error_if_not_finalized("average_cell_to_face_y")
         if self._average_cell_to_face_y is not None:
             return self._average_cell_to_face_y
         cdef np.int64_t[:] I = np.zeros(2*self.n_total_faces_y, dtype=np.int64)
@@ -5364,7 +5367,7 @@ cdef class _TreeMesh:
         (n_faces_z, n_cells) scipy.sparse.csr_matrix
             The scalar averaging operator from cell centers to z faces
         """
-        self._error_if_not_finalized("average_cell_to_face_z", is_property=True)
+        self._error_if_not_finalized("average_cell_to_face_z")
         if self.dim == 2:
             raise Exception('TreeMesh has no z-faces in 2D')
         if self._average_cell_to_face_z is not None:
@@ -5455,7 +5458,7 @@ cdef class _TreeMesh:
         scipy.sparse.csr_matrix
             (n_boundary_faces, n_faces) Projection matrix with shape
         """
-        self._error_if_not_finalized("project_face_to_boundary_face", is_property=True)
+        self._error_if_not_finalized("project_face_to_boundary_face")
         faces_x = self.faces_x
         faces_y = self.faces_y
 
@@ -5491,7 +5494,7 @@ cdef class _TreeMesh:
         (n_boundary_edges, n_edges) scipy.sparse.csr_matrix
             Projection matrix with shape
         """
-        self._error_if_not_finalized("project_edge_to_boundary_edge", is_property=True)
+        self._error_if_not_finalized("project_edge_to_boundary_edge")
         edges_x = self.edges_x
         edges_y = self.edges_y
 
@@ -5534,7 +5537,7 @@ cdef class _TreeMesh:
         (n_boundary_nodes, n_nodes) scipy.sparse.csr_matrix
             Projection matrix with shape
         """
-        self._error_if_not_finalized("project_node_to_boundary_node", is_property=True)
+        self._error_if_not_finalized("project_node_to_boundary_node")
         nodes = self.nodes
         x0, xF = self._xs[0], self._xs[-1]
         y0, yF = self._ys[0], self._ys[-1]
@@ -6998,7 +7001,7 @@ cdef class _TreeMesh:
         """
         return self.get_cells_in_aabb(*rectangle.reshape(self.dim, 2).T)
 
-    def _error_if_not_finalized(self, method: str, is_property: bool):
+    def _error_if_not_finalized(self, method: str):
         """
         Raise error if mesh is not finalized.
         """

discretize/tree_mesh.py

@@ -92,13 +92,12 @@
 from discretize.base import BaseTensorMesh
 from discretize.operators import InnerProducts, DiffOperators
 from discretize.mixins import InterfaceMixins, TreeMeshIO
-from discretize._extensions.tree_ext import _TreeMesh, TreeCell  # NOQA F401
+from discretize._extensions.tree_ext import _TreeMesh, TreeCell, TreeMeshNotFinalizedError  # NOQA F401
 import numpy as np
 import scipy.sparse as sp
 from discretize.utils.code_utils import deprecate_property
 from scipy.spatial import Delaunay
 
-
 class TreeMesh(
     _TreeMesh,
     InnerProducts,
@@ -768,7 +767,7 @@ def total_nodes(self):
         (n_total_nodes, dim) numpy.ndarray of float
             Gridded hanging and non-hanging node locations
         """
-        self._error_if_not_finalized("total_nodes", is_property=True)
+        self._error_if_not_finalized("total_nodes")
         return np.vstack((self.nodes, self.hanging_nodes))
 
     @property

tests/tree/test_safeguards.py

@@ -6,6 +6,7 @@
 import pytest
 
 from discretize import TreeMesh
+from discretize.tree_mesh import TreeMeshNotFinalizedError
 
 
 @pytest.fixture
@@ -82,10 +83,9 @@ def test_errors(self, mesh, prop_name, refine):
         if refine:
             refine_mesh(mesh)
         msg = re.escape(
-            f"The `{prop_name}` property cannot be accessed before "
-            "the mesh is finalized."
+            f"`TreeMesh.{prop_name}` requires a finalized mesh. "
         )
-        with pytest.raises(AttributeError, match=msg):
+        with pytest.raises(TreeMeshNotFinalizedError, match=msg):
             getattr(mesh, prop_name)
 
     @pytest.mark.parametrize("prop_name", PROPERTIES)