derived: DerivedMeasurments now return DerivedMetrics
DerivedMeasurments processors now return DerviedMetrics rather than
measurments. The notion of an InstrumentChannel doesn't really make
sense in the context of DerivedMeasurments, which are not directly
measured on the target. Since Measurement's require a channel, a simpler
DerviedMetric is added that only requires a name and a type.
diff --git a/devlib/derived/__init__.py b/devlib/derived/__init__.py
index 5689a58..5f7dc6e 100644
--- a/devlib/derived/__init__.py
+++ b/devlib/derived/__init__.py
@@ -12,6 +12,45 @@
# See the License for the specific language governing permissions and
# limitations under the License.
#
+
+from devlib.instrument import MeasurementType, MEASUREMENT_TYPES
+
+
+class DerivedMetric(object):
+
+ __slots__ = ['name', 'value', 'measurement_type']
+
+ @property
+ def units(self):
+ return self.measurement_type.units
+
+ def __init__(self, name, value, measurement_type):
+ self.name = name
+ self.value = value
+ if isinstance(measurement_type, MeasurementType):
+ self.measurement_type = measurement_type
+ else:
+ try:
+ self.measurement_type = MEASUREMENT_TYPES[measurement_type]
+ except KeyError:
+ msg = 'Unknown measurement type: {}'
+ raise ValueError(msg.format(measurement_type))
+
+ def __cmp__(self, other):
+ if hasattr(other, 'value'):
+ return cmp(self.value, other.value)
+ else:
+ return cmp(self.value, other)
+
+ def __str__(self):
+ if self.units:
+ return '{}: {} {}'.format(self.name, self.value, self.units)
+ else:
+ return '{}: {}'.format(self.name, self.value)
+
+ __repr__ = __str__
+
+
class DerivedMeasurements(object):
@staticmethod