support writing enums in DynamoDB AWS SDK v1 (#228)

* support writing enums in DynamoDB AWS SDK v1

* fixed CodeNarc

* license

subprojects/micronaut-aws-sdk-dynamodb/src/main/groovy/com/agorapulse/micronaut/aws/dynamodb/DefaultDynamoDBService.groovy

@@ -97,6 +97,28 @@ class DefaultDynamoDBService<TItemClass> implements DynamoDBService<TItemClass>
 
             }
         )
+        .addFirstType(Enum,
+            new ArgumentMarshaller() {
+
+                @Override
+                AttributeValue marshall(Object obj) {
+                    return obj == null ? null : new AttributeValue().withS(obj.toString())
+                }
+
+            },
+            new ArgumentUnmarshaller() {
+
+                @Override
+                void typeCheck(AttributeValue value, Method setter) { }
+
+                @Override
+                Object unmarshall(AttributeValue value) throws ParseException {
+                    // should not happen
+                    throw new IllegalStateException('Cannot unmarshall Enum, add @DynamoDBConvertedEnum annotation to the field')
+                }
+
+            }
+        )
         .build()
 
     // Specific ranges ending with 'Index' are String concatenated indexes,

subprojects/micronaut-aws-sdk-dynamodb/src/test/groovy/com/agorapulse/micronaut/aws/dynamodb/DynamoDBEntity.java

@@ -43,6 +43,9 @@ public class DynamoDBEntity {
 
     Integer number = 0;
 
+    @DynamoDBTypeConvertedEnum
+    State state = State.UNKNOWN;
+
     public String getParentId() {
         return parentId;
     }
@@ -92,6 +95,14 @@ public void setGlobalIndex(String globalIndex) {
         // ignore
     }
 
+    public State getState() {
+        return state;
+    }
+
+    public void setState(State state) {
+        this.state = state;
+    }
+
     //CHECKSTYLE:OFF
     @Override
     public boolean equals(Object o) {

subprojects/micronaut-aws-sdk-dynamodb/src/test/groovy/com/agorapulse/micronaut/aws/dynamodb/State.java

@@ -0,0 +1,28 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright 2018-2024 Agorapulse.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.agorapulse.micronaut.aws.dynamodb;
+
+public enum State {
+
+    OPEN,
+    CLOSED,
+    IN_PROGRESS,
+    CANCELLED,
+    UNKNOWN;
+
+}