shill: Implement write-only properties

Certain properties (e.g. WIFI Passphrase) are write only and must
not be returned when Service.GetProperties() is called over D-Bus.

This CL implements WriteOnlyProperties, a write-only analog of the
read-only ConstProperties.

Also add a ReadablePropertyConstIterator which only returns the
readable properties. Switch over DBus adaptor and PropertyStore
to use that.

BUG=chromium-os:21196
TEST=Added 2 new unittests.

Change-Id: I52815cc395650e0b49e1acac8d4954deeebcee5d
Reviewed-on: https://gerrit.chromium.org/gerrit/11402
Commit-Ready: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Gaurav Shah <gauravsh@chromium.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/profile.h b/profile.h
index b694eefc..6d56ef3b 100644
--- a/profile.h
+++ b/profile.h
@@ -89,8 +89,8 @@ class Profile : public base::RefCounted<Profile> {
   // Return whether |service| can configure itself from the profile.
   bool ContainsService(const ServiceConstRefPtr &service);
 
-  std::vector<std::string> EnumerateAvailableServices();
-  std::vector<std::string> EnumerateEntries();
+  std::vector<std::string> EnumerateAvailableServices(Error *error);
+  std::vector<std::string> EnumerateEntries(Error *error);
 
   // Write all in-memory state to disk via |storage_|.
   virtual bool Save();
@@ -129,7 +129,7 @@ class Profile : public base::RefCounted<Profile> {
 
   void HelpRegisterDerivedStrings(
       const std::string &name,
-      Strings(Profile::*get)(void),
+      Strings(Profile::*get)(Error *),
       void(Profile::*set)(const Strings&, Error *));
 
   // Data members shared with subclasses via getter/setters above in the