bmp element model reworked for libera bpms

bact_device_models/devices/bpm_elem_libera.py

@@ -0,0 +1,44 @@
+import functools
+from dataclasses import dataclass
+
+from typing import Sequence, Union
+
+
+@dataclass
+class BPMElementPosition:
+    #: in nanometer
+    x: int
+    #: in nanometer
+    y: int
+
+
+@dataclass
+class BPMElementSignalFromButtons:
+    """Beam position monitor readings from the buttons
+
+    Todo:
+        find out what the units of these signals are in reality
+    """
+    a: int
+    b: int
+    c: int
+    d: int
+
+
+@dataclass
+class BPMElement:
+    name: str
+    pos: BPMElementPosition
+    sig: Union[BPMElementSignalFromButtons, None]
+
+
+@dataclass
+class BPMElementList:
+    bpms: Sequence[BPMElement]
+
+    def get_eleement(self, name: str) -> BPMElement:
+        @functools.lru_cache(maxsize=1)
+        def get_dict():
+            return {elem.name: elem for elem in self.bpms}
+
+        return get_dict()[name]