feat(iota-framework): added contains_display_object function

crates/iota-framework/packages/iota-system/sources/iota_system.move

@@ -533,6 +533,15 @@ module iota_system::iota_system {
         self.borrow_extra_field_mut(key)
     }
 
+    /// Returns true if there is an extra field associated with the key.
+    public(package) fun contains_extra_field<K: copy + drop + store>(
+        wrapper: &mut IotaSystemState,
+        key: K,
+    ): bool {
+        let self = load_system_state_mut(wrapper);
+        self.contains_extra_field(key)
+    }
+
     #[allow(unused_function)]
     /// This function should be called at the end of an epoch, and advances the system to the next epoch.
     /// It does the following things:

crates/iota-framework/packages/iota-system/sources/iota_system_state_inner.move

@@ -467,6 +467,14 @@ module iota_system::iota_system_state_inner {
         self.extra_fields.borrow_mut(key)
     }
 
+    /// Returns true if there is an extra field associated with the key.
+    public(package) fun contains_extra_field<K: copy + drop + store>(
+        self: &IotaSystemStateV1,
+        key: K,
+    ): bool {
+        self.extra_fields.contains(key)
+    }
+
     // ==== validator metadata management functions ====
 
     /// Create a new `UnverifiedValidatorOperationCap`, transfer it to the

crates/iota-framework/packages/iota-system/sources/system_display.move

@@ -65,6 +65,15 @@ module iota_system::system_display {
         iota_system.borrow_extra_field_mut(key)
     }
 
+    /// Returns true if the related display object exists.
+    public(package) fun contains_display_object<T: key>(iota_system: &mut IotaSystemState): bool {
+        // Get a display object unique key.
+        let key = display_object_key<T>();
+
+        // Check if the related display object exists.
+        iota_system.contains_extra_field(key)
+    }
+
     /// Return a fully qualified type name with the original package IDs
     /// that is used as a display object key.
     fun display_object_key<T>(): String {

crates/iota-framework/published_api.txt

@@ -682,6 +682,9 @@ borrow_extra_field
 borrow_extra_field_mut
 	public(package) fun
 	0x3::iota_system_state_inner
+contains_extra_field
+	public(package) fun
+	0x3::iota_system_state_inner
 rotate_operation_cap
 	public(package) fun
 	0x3::iota_system_state_inner
@@ -910,6 +913,9 @@ borrow_extra_field
 borrow_extra_field_mut
 	public(package) fun
 	0x3::iota_system
+contains_extra_field
+	public(package) fun
+	0x3::iota_system
 advance_epoch
 	fun
 	0x3::iota_system
@@ -1033,6 +1039,9 @@ borrow_display_object
 borrow_display_object_mut
 	public(package) fun
 	0x3::system_display
+contains_display_object
+	public(package) fun
+	0x3::system_display
 display_object_key
 	fun
 	0x3::system_display