get_field_kind is added. (#1150)

* get_field_kind is added.

* Mistakenly added file is removed.

Author: OzanCansel

hazelcast/include/hazelcast/client/serialization/pimpl/compact/compact.h

@@ -90,6 +90,20 @@ class compact_serializer
 class HAZELCAST_API compact_reader
 {
 public:
+    /**
+     * Returns the kind of the field for the given field name.
+     * <p>
+     * If the field with the given name does not exist,
+     * {@link field_kind#NOT_AVAILABLE} is returned.
+     * <p>
+     * This method can be used to check the existence of a field, which can be
+     * useful when the class is evolved.
+     *
+     * @param field_name name of the field.
+     * @return kind of the field
+     */
+    field_kind get_field_kind(const std::string& field_name);
+
     /**
      * Reads a boolean.
      *

hazelcast/src/hazelcast/client/compact.cpp

@@ -2522,6 +2522,18 @@ compact_reader::read_var_size_position(
              : offset + data_start_position;
 }
 
+field_kind
+compact_reader::get_field_kind(const std::string& field_name)
+{
+    auto descriptor = schema.get_field(field_name);
+
+    if (!descriptor) {
+        return field_kind::NOT_AVAILABLE;
+    }
+
+    return descriptor->kind;
+}
+
 bool
 compact_reader::read_boolean(const std::string& fieldName)
 {

hazelcast/src/hazelcast/client/compact.cpp'

@@ -116,6 +116,33 @@ TEST_F(CompactSerializationTest, test_field_order_fixed_size)
     check_schema_field(schema, "isHired", 16, -1, 1);
 }
 
+TEST_F(CompactSerializationTest, test_get_field_kind)
+{
+    schema_writer schema_writer("typeName");
+    auto writer = serialization::pimpl::create_compact_writer(&schema_writer);
+    serialization::hz_serializer<employee_dto>::write(employee_dto{}, writer);
+    auto schema = std::move(schema_writer).build();
+
+    auto data = serialization_service().to_data(employee_dto{});
+
+    serialization::object_data_input input{
+        boost::endian::order::little,
+        data.to_byte_array(),
+        0,
+        serialization_service().get_portable_serializer(),
+        serialization_service().get_compact_serializer(),
+        serialization_service().get_data_serializer(),
+        nullptr
+    };
+
+    auto reader = serialization::pimpl::create_compact_reader(
+      serialization_service().get_compact_serializer(), input, schema);
+
+    EXPECT_EQ(reader.get_field_kind("age"), serialization::field_kind::INT32);
+    EXPECT_EQ(reader.get_field_kind("non_existent_field"),
+              serialization::field_kind::NOT_AVAILABLE);
+}
+
 TEST_F(CompactSerializationTest, test_schema_writer_counts)
 {
     using serialization::field_kind;

hazelcast/test/src/compact/compact_serialization_test.h

@@ -66,6 +66,8 @@ struct hz_serializer<test::compact::employee_dto>
 
         return test::compact::employee_dto{ age, rank, id, isHired, isFired };
     }
+
+    static std::string type_name() { return "employee_dto"; }
 };
 
 } // namespace serialization