Added unit conversion support to ActiveBackend. Added datamanagers in function...

Added unit conversion support to ActiveBackend. Added datamanagers in function ActiveBackend.activeBackend() for the metainfo type 'type_dimension' because I couldn't add metainfo 'atom_number' without it.

python/nomadcore/caching_backend.py

@@ -3,6 +3,7 @@ import numpy as np
 import sys
 import logging
 from nomadcore import parser_backend
+from nomadcore.unit_conversion import unit_conversion
 
 class CachingLevel(object):
     Forward = 1
@@ -192,7 +193,7 @@ class ActiveBackend(object):
                     onClose = onClose.get(ik.name, []))
         dataManagers = {}
         for ikNames, ik in metaInfoEnv.infoKinds.items():
-            if ik.kindStr == "type_document_content":
+            if ik.kindStr == "type_document_content" or ik.kindStr == "type_dimension":
                 superSectionNames = metaInfoEnv.firstAncestorsByType(ik.name).get("type_section", [[]])[0]
                 if not superSectionNames:
                     raise Exception("MetaInfo of conrete value %s is not in any superSection" % ik.name)
@@ -290,10 +291,14 @@ class ActiveBackend(object):
         if cachingLevel == CachingLevel.ForwardAndCache or cachingLevel == CachingLevel.Cache:
             dataManager.superSectionManager.addValue(dataManager.metaInfo, value, gIndex)
 
-    def addRealValue(self, metaName, value, gIndex = -1):
-        """adds a floating point value corresponding to metaName
-        The value is added to the section the meta info metaName is in
-        A gIndex of -1 means the latest section"""
+    def addRealValue(self, metaName, value, gIndex = -1, unit=None):
+        """Adds a floating point value corresponding to metaName The value is
+        added to the section the meta info metaName is in A gIndex of -1 means
+        the latest section
+        """
+        if unit:
+            value = self.convert_unit(value, unit)
+
         dataManager = self.dataManagers[metaName]
         cachingLevel = dataManager.cachingLevel
         if cachingLevel == CachingLevel.Forward or cachingLevel == CachingLevel.ForwardAndCache:
@@ -315,8 +320,12 @@ class ActiveBackend(object):
         if cachingLevel == CachingLevel.ForwardAndCache or cachingLevel == CachingLevel.Cache:
             dataManager.superSectionManager.addArray(dataManager.metaInfo, shape, gIndex)
 
-    def setArrayValues(self, metaName, values, offset = None, gIndex = -1):
-        """adds values to the last array added, array must be a numpy array"""
+    def setArrayValues(self, metaName, values, offset = None, gIndex = -1, unit=None):
+        """Adds values to the last array added, array must be a numpy array
+        """
+        if unit:
+            values = self.convert_unit(values, unit)
+
         dataManager = self.dataManagers[metaName]
         cachingLevel = dataManager.cachingLevel
         if cachingLevel == CachingLevel.Forward or cachingLevel == CachingLevel.ForwardAndCache:
@@ -325,9 +334,13 @@ class ActiveBackend(object):
         if cachingLevel == CachingLevel.ForwardAndCache or cachingLevel == CachingLevel.Cache:
             dataManager.superSectionManager.setArrayValues(dataManager.metaInfo, values, offset, gIndex)
 
-    def addArrayValues(self, metaName, values, gIndex = -1):
-        """adds an array value with the given array values.
-        values must be a numpy array"""
+    def addArrayValues(self, metaName, values, gIndex = -1, unit=None):
+        """Adds an array value with the given array values.  values must be a
+        numpy array.
+        """
+        if unit:
+            values = self.convert_unit(values, unit)
+
         dataManager = self.dataManagers[metaName]
         cachingLevel = dataManager.cachingLevel
         if cachingLevel == CachingLevel.Forward or cachingLevel == CachingLevel.ForwardAndCache:
@@ -347,3 +360,11 @@ class ActiveBackend(object):
         metaInfo = self.metaInfoEnv().infoKindEl(metaName)
         dtypeStr = metaInfo.dtypeStr
         return numpy.zeros(shape, dtype = parser_backend.numpyDtypeForDtypeStr(dtypeStr))
+
+    def convert_unit(self, value, unit):
+        """Try to perform a unit conversion.
+        """
+        converted = unit_conversion.convert_unit(value, unit)
+        if converted is None:
+            raise Exception("ActiveBackend cannot convert to unit '{}'".format(unit))
+        return converted