VolumeType as class with enum member class

src/Common/ErrorCodes.cpp

@@ -494,6 +494,7 @@ namespace ErrorCodes
     extern const int CANNOT_DETACH_DICTIONARY_AS_TABLE = 520;
     extern const int ATOMIC_RENAME_FAIL = 521;
     extern const int INCORRECT_DISK_INDEX = 522;
+    extern const int UNKNOWN_VOLUME_TYPE = 523;
 
     extern const int KEEPER_EXCEPTION = 999;
     extern const int POCO_EXCEPTION = 1000;

src/Disks/IVolume.cpp

@@ -10,6 +10,30 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int EXCESSIVE_ELEMENT_IN_CONFIG;
+    extern const int UNKNOWN_VOLUME_TYPE;
+}
+
+void VolumeType::fromString(const String & str)
+{
+    if (str == "JBOD")
+        value = JBOD;
+    else if (str == "SINGLE_DISK")
+        value = SINGLE_DISK;
+    else
+        throw DB::Exception("Unexpected string for volume type: " + str, ErrorCodes::UNKNOWN_VOLUME_TYPE);
+}
+
+String VolumeType::toString() const
+{
+    switch (value)
+    {
+        case JBOD:
+            return "JBOD";
+        case SINGLE_DISK:
+            return "SINGLE_DISK";
+        default:
+            return "Unknown";
+    }
 }
 
 IVolume::IVolume(

src/Disks/IVolume.h

@@ -8,11 +8,33 @@
 namespace DB
 {
 
-enum VolumeType
+class VolumeType
 {
+public:
+    enum Value
+    {
         JBOD,
         SINGLE_DISK,
         UNKNOWN
+    };
+    VolumeType() : value(UNKNOWN) {}
+    VolumeType(Value value_) : value(value_) {}
+
+    bool operator==(const VolumeType & other) const
+    {
+        return value == other.value;
+    }
+
+    bool operator!=(const VolumeType & other) const
+    {
+        return !(*this == other);
+    }
+
+    void fromString(const String & str);
+    String toString() const;
+
+private:
+    Value value;
 };
 
 class IVolume;