add decoders and tests

boswatch/decoder/decoder.py

@@ -0,0 +1,52 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+"""!
+    ____  ____  ______       __      __       __       _____
+   / __ )/ __ \/ ___/ |     / /___ _/ /______/ /_     |__  /
+  / __  / / / /\__ \| | /| / / __ `/ __/ ___/ __ \     /_ <
+ / /_/ / /_/ /___/ /| |/ |/ / /_/ / /_/ /__/ / / /   ___/ /
+/_____/\____//____/ |__/|__/\__,_/\__/\___/_/ /_/   /____/
+                German BOS Information Script
+                     by Bastian Schroll
+
+@file:        decoder.py
+@date:        06.01.2018
+@author:      Bastian Schroll
+@description: Some utils for the decoding
+"""
+import logging
+
+from boswatch.decoder.fms import Fms
+from boswatch.decoder.pocsag import Pocsag
+from boswatch.decoder.zvei import Zvei
+
+logging.debug("- %s loaded", __name__)
+
+
+def getDecoder(data):
+    """!Choose the right decoder and return the new decoder object
+
+    @param data: data to decode
+    @return Decoder object"""
+    logging.debug("search decoder")
+    if "FMS" in data:
+        return Fms()
+    elif "POCSAG" in data:
+        return Pocsag()
+    elif "ZVEI" in data:
+        return Zvei()
+    else:
+        logging.debug("no decoder found for: %s", data)
+        return DummyDecoder()
+
+
+class DummyDecoder:
+    """!This dummy decoder class is needed because in case of
+    an getDecoder() with false data, we must return a decoder
+    object with an decode() method to prevent an error"""
+    def __init__(self):
+        pass
+
+    @staticmethod
+    def decode(data):
+        return None