Bug 668157 part.1 Add Preferences::GetType() and Preferences::GetDefaultType() r=roc

modules/libpref/public/Preferences.h

@@ -237,6 +237,11 @@ public:
    */
   static bool HasUserValue(const char* aPref);
 
+  /**
+   * Gets the type of the pref.
+   */
+  static PRInt32 GetType(const char* aPref);
+
   /**
    * Adds/Removes the observer for the root pref branch.
    * The observer is referenced strongly if AddStrongObserver is used.  On the
@@ -343,6 +348,11 @@ public:
   static nsresult GetDefaultComplex(const char* aPref, const nsIID &aType,
                                     void** aResult);
 
+  /**
+   * Gets the type of the pref.
+   */
+  static PRInt32 GetDefaultType(const char* aPref);
+
   // Used to synchronise preferences between chrome and content processes.
   static void MirrorPreferences(nsTArray<PrefTuple,
                                 nsTArrayInfallibleAllocator> *aArray);

modules/libpref/src/Preferences.cpp

@@ -1328,6 +1328,16 @@ Preferences::HasUserValue(const char* aPref)
   return PREF_HasUserPref(aPref);
 }
 
+// static
+PRInt32
+Preferences::GetType(const char* aPref)
+{
+  NS_ENSURE_TRUE(InitStaticMembers(), nsIPrefBranch::PREF_INVALID);
+  PRInt32 result;
+  return NS_SUCCEEDED(sRootBranch->GetPrefType(aPref, &result)) ?
+    result : nsIPrefBranch::PREF_INVALID;
+}
+
 // static
 nsresult
 Preferences::AddStrongObserver(nsIObserver* aObserver,
@@ -1640,4 +1650,14 @@ Preferences::GetDefaultComplex(const char* aPref, const nsIID &aType,
   return sDefaultRootBranch->GetComplexValue(aPref, aType, aResult);
 }
 
+// static
+PRInt32
+Preferences::GetDefaultType(const char* aPref)
+{
+  NS_ENSURE_TRUE(InitStaticMembers(), nsIPrefBranch::PREF_INVALID);
+  PRInt32 result;
+  return NS_SUCCEEDED(sDefaultRootBranch->GetPrefType(aPref, &result)) ?
+    result : nsIPrefBranch::PREF_INVALID;
+}
+
 } // namespace mozilla