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helix/validators/dxf_layer_validator.py

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+"""
+Created on Mar 23, 2017
+
+@author: jvazquez
+"""
+from helix.constants.file_validation_error import FileValidationMessage
+from helix.models.dxf.dxf_error import OldDxfFormatException
+
+
+class DXFLayerValidator(object):
+    """
+    In 2017, Aurora changed the format of their DXF files to meet new
+    specifications.  The old-style DXF files will not
+    be supported, and this class will screen for old files.
+    Most noticably, old files used "Roofs" section headers while
+    new files use "Buildings"
+    """
+
+    def __init__(self):
+        self.layers = set()
+        self.new_aurora_format = False
+
+    def add_layer(self, layer):
+        """Add a layer in a set
+
+            param
+                layer (string)
+
+        """
+        self.layers.add(layer)
+
+    def determine_file(self):
+        """Based on the layers of the dxf,
+        we will determine if is a "new"
+        file format
+        or is the "old" format.
+
+        Bare in mind that we are <strong>assuming</strong>
+        this based on an assumption.
+
+        There's no drastic visible difference
+        in the files if you inspect them
+        with a text editor.
+
+        The whole difference comes
+        from the space in the panels.
+        The width remains the same, but there is a gap
+        in the middle in the new format.
+
+        At this moment, this is the simplest
+        format we know on how to determine this.
+
+        """
+
+        try:
+            assert "Buildings" in self.layers and "Roofs" not in self.layers
+            self.new_aurora_format = True
+        except AssertionError:
+            error = FileValidationMessage.OldDxfFormat.value
+            raise OldDxfFormatException(error)
+
+    def is_new_aurora_format(self):
+        """ return boolean """
+
+        return self.new_aurora_format