PFW: Type safe dynamic parameter access

BZ: 15065

Replaced high level string based parameter access interface with typed ones.
Now hosting platforms that want to control parameters must instantiate a
CParameterHandle object out of the desired parameter path.
CParameterHandle object may be used to access any kind of parameters, whatever
its internal type, whether it's an array or not.
Note that non rogue parameters offer a read access only. Any attempt to write
them will fail.
CParameterHandle objects offer the following kind of parameter accessing
interfaces:
- Boolean
- Integer (signed or unsigned)
- Double
- String
Note that those interfaces are available for scalar as well as for array
parameters.
Not all parameter types support all access kinds. Naturally, array parameters
are only accessed via array interfaces while scalar parameters are managed
through scalar interfaces.
Here's a list of parameter types that may be controlled through each kind of
access interface:
- Boolean access: boolean, bit (bit size must be one);
- Integer access: integer (sign must match), boolean (unsigned access only,
value <= 1), enumerations;
- Double access: for now only fixed points (soon integers will support them
also through platform adaptation objects)
- String access: all parameter types

In addition, cleaned up parameter access related code so as to make it more
generic and reusable.

Changed version to 2.0.0

Change-Id: Ib80868cdb773e90962e48f1f38d2ff0029189815
Signed-off-by: Patrick Benavoli <patrickx.benavoli@intel.com>
Reviewed-on: http://android.intel.com:8080/25406
Reviewed-by: Barthes, FabienX <fabienx.barthes@intel.com>
Tested-by: Barthes, FabienX <fabienx.barthes@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>

1 files changed, 16 insertions, 3 deletions

diff --git a/parameter/ParameterType.h b/parameter/ParameterType.h
index e8e67a5..37ba869 100644
--- a/parameter/ParameterType.h
+++ b/parameter/ParameterType.h
@@ -52,9 +52,22 @@ public:
     // From IXmlSink
     virtual bool fromXml(const CXmlElement& xmlElement, CXmlSerializingContext& serializingContext);
 
-    // Conversion
-    virtual bool asInteger(const string& strValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const = 0;
-    virtual void asString(const uint32_t& uiValue, string& strValue, CParameterAccessContext& parameterAccessContext) const = 0;
+    /// Conversions
+    // String
+    virtual bool toBlackboard(const string& strValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const = 0;
+    virtual bool fromBlackboard(string& strValue, const uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const = 0;
+    // Boolean
+    virtual bool toBlackboard(bool bUserValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const;
+    virtual bool fromBlackboard(bool& bUserValue, uint32_t uiValue, CParameterAccessContext& parameterAccessContext) const;
+    // Integer
+    virtual bool toBlackboard(uint32_t uiUserValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const;
+    virtual bool fromBlackboard(uint32_t& uiUserValue, uint32_t uiValue, CParameterAccessContext& parameterAccessContext) const;
+    // Signed Integer
+    virtual bool toBlackboard(int32_t iUserValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const;
+    virtual bool fromBlackboard(int32_t& iUserValue, uint32_t uiValue, CParameterAccessContext& parameterAccessContext) const;
+    // Double
+    virtual bool toBlackboard(double dUserValue, uint32_t& uiValue, CParameterAccessContext& parameterAccessContext) const;
+    virtual bool fromBlackboard(double& dUserValue, uint32_t uiValue, CParameterAccessContext& parameterAccessContext) const;
 
     // XML Serialization value space handling
     // Value space handling for configuration import/export