Support layout changes when property @Name changes.

1 files changed, 37 insertions, 4 deletions

diff --git a/src/main/java/com/amazon/carbonado/info/StorableIntrospector.java b/src/main/java/com/amazon/carbonado/info/StorableIntrospector.java
index b21c8f3..ebcffb5 100644
--- a/src/main/java/com/amazon/carbonado/info/StorableIntrospector.java
+++ b/src/main/java/com/amazon/carbonado/info/StorableIntrospector.java
@@ -90,10 +90,10 @@ public class StorableIntrospector {
     /**

      * Examines the given class and returns a StorableInfo describing it. A

      * MalformedTypeException is thrown for a variety of reasons if the given

-     * class is not a well-defined Storable type.

+     * class is an invalid Storable type.

      *

      * @param type Storable type to examine

-     * @throws MalformedTypeException if Storable type is not well-formed

+     * @throws MalformedTypeException if Storable type is invalid

      * @throws IllegalArgumentException if type is null

      */

     @SuppressWarnings("unchecked")

@@ -309,6 +309,40 @@ public class StorableIntrospector {
         }

     }

 

+    /**

+     * Examines a class and determines what Storable type it implements. If it

+     * cannot be unambiguously inferred, null is returned. A non-null return

+     * value does not imply that the Storable type is valid, however. It must

+     * be {@link #examine examined} to check validity.

+     *

+     * @since 1.2

+     */

+    public static Class<? extends Storable> inferType(Class clazz) {

+        if (clazz == null || !Storable.class.isAssignableFrom(clazz)) {

+            return null;

+        }

+

+        if (clazz.isAnnotationPresent(PrimaryKey.class)) {

+            return clazz;

+        }

+

+        Class candidate = inferType(clazz.getSuperclass());

+

+        for (Class iface : clazz.getInterfaces()) {

+            Class inferred = inferType(iface);

+            if (inferred != null) {

+                if (candidate == null) {

+                    candidate = inferred;

+                } else {

+                    // Inference is ambiguous.

+                    return null;

+                }

+            }

+        }

+            

+        return candidate;

+    }

+

     private static class NameAndDirection {

         final String name;

         final Direction direction;

@@ -487,8 +521,7 @@ public class StorableIntrospector {
                 throw new MalformedTypeException(type, "Storable interface must be extended");

             }

         } else {

-            throw new MalformedTypeException

-                (type, "Does not implement Storable interface");

+            throw new MalformedTypeException(type, "Does not implement Storable interface");

         }

         int modifiers = type.getModifiers();

         if (Modifier.isFinal(modifiers)) {