Changed implementation for list of nested objects for timestamp extension and added tests

Author: roamariei

services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/extensions/AutoGeneratedTimestampRecordExtension.java

@@ -151,7 +151,7 @@ public WriteModification beforeWrite(DynamoDbExtensionContext.BeforeWrite contex
                     updatedItems.put(key, AttributeValue.builder().m(processed).build());
                 }
             } else if (value.hasL() && !value.l().isEmpty() && value.l().get(0).hasM()) {
-                TableSchema<?> elementListSchema = getTableSchemaForElementList(context.tableSchema(), key);
+                TableSchema<?> elementListSchema = getTableSchemaForListElement(context.tableSchema(), key);
 
                 List<AttributeValue> updatedList = value.l().stream()
                                                         .map(listItem -> listItem.hasM() ?
@@ -185,11 +185,11 @@ public WriteModification beforeWrite(DynamoDbExtensionContext.BeforeWrite contex
                                 .build();
     }
 
-    private TableSchema<?> getTableSchemaForElementList(TableSchema<?> rootSchema, String key) {
-        TableSchema<?> elementListSchema;
+    private TableSchema<?> getTableSchemaForListElement(TableSchema<?> rootSchema, String key) {
+        TableSchema<?> listElementSchema;
         try {
             if (!key.contains(NESTED_OBJECT_UPDATE)) {
-                elementListSchema = TableSchema.fromClass(
+                listElementSchema = TableSchema.fromClass(
                     Class.forName(rootSchema.converterForAttribute(key).type().rawClassParameters().get(0).rawClass().getName()));
             } else {
                 String[] parts = NESTED_OBJECT_PATTERN.split(key);
@@ -202,13 +202,13 @@ private TableSchema<?> getTableSchemaForElementList(TableSchema<?> rootSchema, S
                     }
                 }
                 String attributeName = parts[parts.length - 1];
-                elementListSchema = TableSchema.fromClass(
+                listElementSchema = TableSchema.fromClass(
                     Class.forName(currentSchema.converterForAttribute(attributeName).type().rawClassParameters().get(0).rawClass().getName()));
             }
         } catch (ClassNotFoundException e) {
             throw new IllegalArgumentException("Class not found for field name: " + key, e);
         }
-        return elementListSchema;
+        return listElementSchema;
     }
 
     private Map<String, TableSchema<?>> resolveSchemasPerPath(Map<String, AttributeValue> attributesToSet,