refactor(yoko-rmi-impl): add type narrowing for CORBA object deserialization

- Modified CorbaObjectReader.readCorbaObject() to perform PortableRemoteObject.narrow() when a target type is provided
- Updated CorbaObjectFieldDescriptor to pass field type to readCorbaObject() instead of null
- Added convenience method readCorbaObject() without parameters in ObjectReader
- Simplified ValueMemberFieldDescriptor to use method reference for CORBA object reading
- Substantive lines added: 7, lines removed: 4

Co-authored-by-AI: IBM Bob 1.0.4

Author: ngmr

yoko-rmi-impl/src/main/java/org/apache/yoko/rmi/impl/CorbaObjectReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 IBM Corporation and others.
+ * Copyright 2026 IBM Corporation and others.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -175,7 +175,8 @@ public Object readValueObject(Class<?> clz) {
     }
 
     public org.omg.CORBA.Object readCorbaObject(Class<?> type) {
-        return in.read_Object();
+        org.omg.CORBA.Object obj = in.read_Object();
+        return (null == type) ? obj : (org.omg.CORBA.Object)PortableRemoteObject.narrow(obj, type);
     }
 
     public Remote readRemoteObject(Class<?> type) {

yoko-rmi-impl/src/main/java/org/apache/yoko/rmi/impl/FieldDescriptor.java

@@ -1027,12 +1027,12 @@ public void resolve(Object value) {
     }
 
     void read(ObjectReader reader, Object obj) throws IOException {
-        Object value = reader.readCorbaObject(null);
+        Object value = reader.readCorbaObject(type);
         set(obj, value);
     }
 
     void readFieldIntoMap(ObjectReader reader, Map<String, Object> map) {
-        Object value = reader.readCorbaObject(null);
+        Object value = reader.readCorbaObject(type);
         map.put(java_name, value);
 
     }

yoko-rmi-impl/src/main/java/org/apache/yoko/rmi/impl/ObjectReader.java

@@ -47,6 +47,8 @@ abstract class ObjectReader extends ObjectInputStream {
 
     @Override
     protected abstract Object readObjectOverride() throws IOException, ClassNotFoundException;
+
+    final org.omg.CORBA.Object readCorbaObject() { return readCorbaObject(null); }
 }
 
 abstract class ObjectReaderBase extends ObjectReader {

yoko-rmi-impl/src/main/java/org/apache/yoko/rmi/impl/ValueMemberFieldDescriptor.java

@@ -122,7 +122,7 @@ private enum TypeReaders {
             READERS[_tk_wstring] = ObjectReader::readValueObject;
             READERS[_tk_any] = ObjectReader::readAny;
             READERS[_tk_abstract_interface] = ObjectReader::readAny;
-            READERS[_tk_objref] = reader -> reader.readCorbaObject(null);
+            READERS[_tk_objref] = ObjectReader::readCorbaObject;
             READERS[_tk_value] = ObjectReader::readValueObject;
             READERS[_tk_value_box] = ObjectReader::readValueObject;
             READERS[_tk_sequence] = ObjectReader::readValueObject;