Allow access to serde registry from ObjectMapper (#948)

currently if you create an ObjectMapper there is no way to access the associated SerdeRegistry. Some implementations (like in Micronaut Data) that create the default mapper need access to this. This simple PR adds a getter to retrieve it.

serde-api/src/main/java/io/micronaut/serde/ObjectMapper.java

@@ -67,6 +67,15 @@ default ObjectMapper cloneWithConfiguration(
         return this;
     }
 
+    /**
+     * Returns the {@link SerdeRegistry} used by this object mapper, if possible.
+     *
+     * @return The serde registry
+     */
+    default @NonNull SerdeRegistry getSerdeRegistry() {
+        throw new UnsupportedOperationException("No accessible SerdeRegistry");
+    }
+
     /**
      * Get the default ObjectMapper instance.
      *

serde-api/src/main/java/io/micronaut/serde/ObjectMappers.java

@@ -102,6 +102,11 @@ protected Set<String> getIncludedPackages() {
         ObjectMapper objectMapper = context.getBean(ObjectMapper.class);
         return new ObjectMapper.CloseableObjectMapper() {
 
+            @Override
+            public SerdeRegistry getSerdeRegistry() {
+                return objectMapper.getSerdeRegistry();
+            }
+
             @Override
             public <T> T readValueFromTree(JsonNode tree, Argument<T> type) throws IOException {
                 return objectMapper.readValueFromTree(tree, type);

serde-bson/src/main/java/io/micronaut/serde/bson/AbstractBsonMapper.java

@@ -68,6 +68,11 @@ protected AbstractBsonMapper(SerdeRegistry registry, SerdeConfiguration serdeCon
         this.decoderContext = registry.newDecoderContext(view);
     }
 
+    @Override
+    public SerdeRegistry getSerdeRegistry() {
+        return this.registry;
+    }
+
     protected abstract BsonReader createBsonReader(ByteBuffer byteBuffer);
 
     protected abstract AbstractBsonWriter createBsonWriter(OutputStream bsonOutput) throws IOException;

serde-jackson/src/main/java/io/micronaut/serde/jackson/JacksonJsonMapper.java

@@ -125,6 +125,11 @@ private JacksonJsonMapper(@NonNull SerdeRegistry registry,
         this.specificSerializer = serializer;
     }
 
+    @Override
+    public SerdeRegistry getSerdeRegistry() {
+        return this.registry;
+    }
+
     @NonNull
     @Override
     public JsonMapper createSpecific(@NonNull Argument<?> type) {

serde-jsonp/src/main/java/io/micronaut/serde/json/stream/JsonStreamMapper.java

@@ -83,6 +83,11 @@ private JsonStreamMapper(@NonNull SerdeRegistry registry, @Nullable SerdeConfigu
         this.view = view;
     }
 
+    @Override
+    public SerdeRegistry getSerdeRegistry() {
+        return this.registry;
+    }
+
     @Override
     public ObjectMapper cloneWithConfiguration(@Nullable SerdeConfiguration configuration, @Nullable SerializationConfiguration serializationConfiguration, @Nullable DeserializationConfiguration deserializationConfiguration) {
         return new JsonStreamMapper(registry.cloneWithConfiguration(configuration, serializationConfiguration, deserializationConfiguration), configuration == null ? serdeConfiguration : configuration, view);

serde-oracle-jdbc-json/src/main/java/io/micronaut/serde/oracle/jdbc/json/AbstractOracleJdbcJsonObjectMapper.java

@@ -73,6 +73,11 @@ protected AbstractOracleJdbcJsonObjectMapper(SerdeRegistry registry, SerdeConfig
         this.view = view;
     }
 
+    @Override
+    public SerdeRegistry getSerdeRegistry() {
+        return this.registry;
+    }
+
     abstract OracleJsonParser getJsonParser(InputStream inputStream);
 
     abstract OracleJsonGenerator createJsonGenerator(OutputStream outputStream);