Map integer properties with int64 format to long

README.md

@@ -109,6 +109,8 @@ An annotation processor converting JSON schemas to java records.
 | array       |               |               | Immutable java.util.List |
 | number      |               | required      | double                   |
 | number      |               | non required  | java.lang.Double         |
+| integer     | int64         | required      | long                     |
+| integer     | int64         | non required  | java.lang.Long           |
 | integer     |               | required      | int                      |
 | integer     |               | non required  | java.lang.Integer        |
 | boolean     |               | required      | boolean                  |

core/src/main/java/com/cosium/json_schema_to_java_record/JsonSchemaContent.java

@@ -95,6 +95,12 @@ public TypeName writeJavaType(
             yield ClassName.get(Double.class);
           }
           case INTEGER -> {
+            if ("int64".equals(format)) {
+              if (preferPrimitive) {
+                yield TypeName.LONG;
+              }
+              yield ClassName.get(Long.class);
+            }
             if (preferPrimitive) {
               yield TypeName.INT;
             }

tests/src/test/java/com/cosium/json_schema_to_java_record_tests/case1/Int64Properties.java

@@ -0,0 +1,12 @@
+package com.cosium.json_schema_to_java_record_tests.case1;
+
+import java.util.function.Function;
+
+/**
+ * Fails to compile if an int64 property is not generated as a long: an int would box to Integer.
+ */
+class Int64Properties {
+
+  static final Function<Customer, Long> REQUIRED = Customer::id;
+  static final Function<Customer, Long> NON_REQUIRED = Customer::referrerId;
+}

tests/src/test/resources/com/cosium/json_schema_to_java_record_tests/case1/customer.json

@@ -3,6 +3,14 @@
   "$id": "customer",
   "type": "object",
   "properties": {
+    "id": {
+      "type": "integer",
+      "format": "int64"
+    },
+    "referrerId": {
+      "type": "integer",
+      "format": "int64"
+    },
     "firstName": {
       "type": "string"
     },
@@ -19,5 +27,5 @@
       }
     }
   },
-  "required": [ "firstName", "lastName" ]
+  "required": [ "id", "firstName", "lastName" ]
 }