Support for string value

tools/telemetry/telemetry/value/list_of_string_values.py

Index: tools/telemetry/telemetry/value/list_of_string_values.py
diff --git a/tools/telemetry/telemetry/value/list_of_scalar_values.py b/tools/telemetry/telemetry/value/list_of_string_values.py
similarity index 83%
copy from tools/telemetry/telemetry/value/list_of_scalar_values.py
copy to tools/telemetry/telemetry/value/list_of_string_values.py
index cb70be8c89b50e2f9406ba0b43a0f53725ef897b..b99f70801843cbedcd9e3e57fd4b0a19177871a1 100644
--- a/tools/telemetry/telemetry/value/list_of_scalar_values.py
+++ b/tools/telemetry/telemetry/value/list_of_string_values.py
@@ -2,21 +2,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import numbers
-
 from telemetry import value as value_module
 
-def _Mean(values):
-  return float(sum(values)) / len(values) if len(values) > 0 else 0.0
-
-class ListOfScalarValues(value_module.Value):
+class ListOfStringValues(value_module.Value):
   def __init__(self, page, name, units, values,
                important=True, same_page_merge_policy=value_module.CONCATENATE):
-    super(ListOfScalarValues, self).__init__(page, name, units, important)
+    super(ListOfStringValues, self).__init__(page, name, units, important)
     assert len(values) > 0
     assert isinstance(values, list)
     for v in values:
-      assert isinstance(v, numbers.Number)
+      assert isinstance(v, basestring)
     self.values = values
     self.same_page_merge_policy = same_page_merge_policy
 
@@ -29,7 +24,7 @@ class ListOfScalarValues(value_module.Value):
       merge_policy = 'CONCATENATE'
     else:
       merge_policy = 'PICK_FIRST'
-    return ('ListOfScalarValues(%s, %s, %s, %s, ' +
+    return ('ListOfStringValues(%s, %s, %s, %s, ' +
             'important=%s, same_page_merge_policy=%s)') % (
               page_name,
               self.name, self.units,
@@ -46,13 +41,13 @@ class ListOfScalarValues(value_module.Value):
     return self.values
 
   def GetRepresentativeNumber(self):
-    return _Mean(self.values)
+    return None
 
   def GetRepresentativeString(self):
     return repr(self.values)
 
   def IsMergableWith(self, that):
-    return (super(ListOfScalarValues, self).IsMergableWith(that) and
+    return (super(ListOfStringValues, self).IsMergableWith(that) and
             self.same_page_merge_policy == that.same_page_merge_policy)
 
   @classmethod
@@ -61,7 +56,7 @@ class ListOfScalarValues(value_module.Value):
     v0 = values[0]
 
     if v0.same_page_merge_policy == value_module.PICK_FIRST:
-      return ListOfScalarValues(
+      return ListOfStringValues(
           v0.page, v0.name, v0.units,
           values[0].values,
           important=v0.important,
@@ -71,7 +66,7 @@ class ListOfScalarValues(value_module.Value):
     all_values = []
     for v in values:
       all_values.extend(v.values)
-    return ListOfScalarValues(
+    return ListOfStringValues(
         v0.page, v0.name, v0.units,
         all_values,
         important=v0.important,
@@ -89,7 +84,7 @@ class ListOfScalarValues(value_module.Value):
       name = v0.name
     else:
       name = v0.name_suffix
-    return ListOfScalarValues(
+    return ListOfStringValues(
         None, name, v0.units,
         all_values,
         important=v0.important,