Add helper function to facilitate use of library with oneOf types by selecting current type of item instead of checking all of them

Author: uasouz

api/src/main/java/io/serverlessworkflow/serialization/DeserializeHelper.java

@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.core.TreeNode;
 import com.fasterxml.jackson.databind.JsonMappingException;
 import java.io.IOException;
+import java.lang.reflect.Field;
 import java.util.Collection;
 
 public class DeserializeHelper {
@@ -32,7 +33,12 @@ public static <T> T deserializeOneOf(
     for (Class<?> unionType : unionTypes) {
       try {
         Object object = p.getCodec().treeToValue(node, unionType);
-        return targetClass.getConstructor(unionType).newInstance(object);
+        T instance = targetClass.getConstructor(unionType).newInstance(object);
+        Field typeField = targetClass.getDeclaredField("definition");
+        typeField.setAccessible(true);
+        typeField.set(instance, object);
+
+        return instance;
       } catch (IOException | ReflectiveOperationException io) {
         ex.addSuppressed(io);
       }

api/src/test/java/io/serverlessworkflow/api/ApiTest.java

@@ -34,12 +34,14 @@ void testCallHTTPAPI() throws IOException {
     assertThat(workflow.getDo().get(0).getName()).isNotNull();
     assertThat(workflow.getDo().get(0).getTask()).isNotNull();
     Task task = workflow.getDo().get(0).getTask();
-    CallTask callTask = task.getCallTask();
-    assertThat(callTask).isNotNull();
-    assertThat(task.getDoTask()).isNull();
-    CallHTTP httpCall = callTask.getCallHTTP();
-    assertThat(httpCall).isNotNull();
-    assertThat(callTask.getCallAsyncAPI()).isNull();
-    assertThat(httpCall.getWith().getMethod()).isEqualTo("get");
+    if (task.getDefinition() instanceof CallTask) {
+      CallTask callTask = task.getCallTask();
+      assertThat(callTask).isNotNull();
+      assertThat(task.getDoTask()).isNull();
+      CallHTTP httpCall = callTask.getCallHTTP();
+      assertThat(httpCall).isNotNull();
+      assertThat(callTask.getCallAsyncAPI()).isNull();
+      assertThat(httpCall.getWith().getMethod()).isEqualTo("get");
+    }
   }
 }

custom-generator/src/main/java/io/serverlessworkflow/generator/AllAnyOneOfSchemaRule.java

@@ -166,6 +166,19 @@ private JDefinedClass createUnionClass(
       definedClass
           .annotate(JsonDeserialize.class)
           .param("using", generateDeserializer(definedClass, unionTypes));
+
+      JType clazzClass = definedClass.owner()._ref(Object.class);
+
+      JFieldVar typeField =
+          definedClass.field(
+              JMod.PRIVATE,
+              clazzClass,
+              ruleFactory.getNameHelper().getPropertyName("definition", null),
+              null);
+
+      GeneratorUtils.buildMethod(
+              definedClass, typeField, ruleFactory.getNameHelper(), "definition");
+
       return populateClass(definedClass, refType, unionTypes);
     } catch (JClassAlreadyExistsException e) {
       throw new IllegalArgumentException(e);