Merge pull request #13 from Rhinemann/lab5/kovalenko-SCRUM-98-FileReader

SCRUM-98 file reader

MapView/domain/accelerometer.py

@@ -0,0 +1,7 @@
+from dataclasses import dataclass
+
+@dataclass
+class Accelerometer:
+  x: int
+  y: int
+  z: int

MapView/fileReader.py

@@ -0,0 +1,50 @@
+from csv import reader
+import config
+from domain.accelerometer import Accelerometer
+
+
+
+class FileReader:
+    def __init__(
+        self, data_filename: str,
+    ) -> None:
+        self.file_path = data_filename
+        pass
+
+    def read(self):
+        return self.getNextValue()
+
+    def startReading(self, *args, **kwargs):
+        self.file = open(self.file_path, newline='')
+        self.file_reader = reader(self.file, skipinitialspace=True)
+        file_header = next(self.file_reader)
+        
+        self.x_idx = file_header.index('X')
+        self.y_idx = file_header.index('Y')
+        self.z_idx = file_header.index('Z')
+
+    def getNextValue(self):
+        while True:
+            row = next(self.file_reader, None)
+            if row is None:
+                self._rewind_file()
+                continue
+            try:
+                x = int(row[self.x_idx])
+                y = int(row[self.y_idx])
+                z = int(row[self.z_idx])
+                return Accelerometer(x=x, y=y, z=z)
+            except Exception as e:
+                continue
+        
+    def _rewind_file(self):
+        self.file.seek(0)
+        self.file_reader = reader(self.file)
+        next(self.file_reader)
+        
+    def stopReading(self, *args, **kwargs):
+        if self.file:
+            self.file.close()
+        self.file_reader = None
+        
+