Handle amend of mapping values at PFW level

BZ: 24271

Amend mechanism can be used by various plugins, right now it is
implemented in alsa one.

Move this implementation in the PFW for all plugin to benefit
from this mechanism.

Change-Id: I3f193a732b00586c52303390f353fea00f4ce8ec
Signed-off-by: Guillaume Denneulin <guillaumex.denneulin@intel.com>
Reviewed-on: http://android.intel.com:8080/35905
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, 36 insertions, 0 deletions

diff --git a/parameter/SubsystemObject.cpp b/parameter/SubsystemObject.cpp
index ce6275b..5d92127 100644
--- a/parameter/SubsystemObject.cpp
+++ b/parameter/SubsystemObject.cpp
@@ -31,6 +31,7 @@
 #include "SubsystemObject.h"
 #include "InstanceConfigurableElement.h"
 #include "ParameterBlackboard.h"
+#include "MappingContext.h"
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
@@ -176,3 +177,38 @@ void CSubsystemObject::log(const string& strMessage, ...) const
 
     _pInstanceConfigurableElement->log(acBuffer);
 }
+
+// Amendment
+string CSubsystemObject::formatMappingValue(const string& strMappingValue, uint32_t uiFirstAmendKey, uint32_t uiNbAmendKeys, const CMappingContext& context)
+{
+    string strFormattedValue = strMappingValue;
+    // Search for amendment (only one supported for now)
+    size_t uiPercentPos = strFormattedValue.find('%', 0);
+
+    // Amendment limited to one digit (values from 1 to 9)
+    assert((uiNbAmendKeys > 0) && (uiNbAmendKeys <= 9));
+
+    // Check we found one and that there's room for value
+    if (uiPercentPos != string::npos && uiPercentPos < strFormattedValue.size() - 1) {
+
+        // Get Amend number
+        uint32_t uiAmendNumber = strFormattedValue[uiPercentPos + 1] - '0';
+
+        // Valid?
+        if (uiAmendNumber && uiAmendNumber <= uiNbAmendKeys) {
+
+            uint32_t uiAmendType = uiFirstAmendKey + uiAmendNumber - 1;
+
+            // Set?
+            if (context.iSet(uiAmendType)) {
+
+                // Get Amend value
+                string strAmendValue = context.getItem(uiAmendType);
+
+                // Make the amendment
+                strFormattedValue = strFormattedValue.substr(0, uiPercentPos) + strAmendValue + strFormattedValue.substr(uiPercentPos + 2, strFormattedValue.size() - uiPercentPos - 2);
+            }
+        }
+    }
+    return strFormattedValue;
+}