From 6e894b3ebd0c2d6d2c2551ec013ae8db885d7ab4 Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Sat, 27 Dec 2008 01:40:50 +0000
Subject: Support covariant properties. Cojen must support this feature too in
 order to work (revision 169).

---
 .../amazon/carbonado/gen/StorableGenerator.java    | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'src/main/java/com/amazon/carbonado/gen')

diff --git a/src/main/java/com/amazon/carbonado/gen/StorableGenerator.java b/src/main/java/com/amazon/carbonado/gen/StorableGenerator.java
index d194634..f84748f 100644
--- a/src/main/java/com/amazon/carbonado/gen/StorableGenerator.java
+++ b/src/main/java/com/amazon/carbonado/gen/StorableGenerator.java
@@ -968,6 +968,8 @@ public final class StorableGenerator<S extends Storable> {
                         b.returnVoid();
                     }
                 }
+
+                addPropertyBridges(property);
             }
         }
 
@@ -1760,6 +1762,50 @@ public final class StorableGenerator<S extends Storable> {
         }
     }
 
+    private void addPropertyBridges(StorableProperty<S> property) {
+        Class[] covariantTypes = property.getCovariantTypes();
+        if (covariantTypes == null || covariantTypes.length == 0) {
+            return;
+        }
+
+        // Define copy bridges to allow covariant property types.
+
+        for (Class type : covariantTypes) {
+            TypeDesc desc = TypeDesc.forClass(type);
+
+            if (property.getReadMethod() != null &&
+                property.getReadMethod().getReturnType() != type)
+            {
+                MethodInfo mi = addMethodIfNotFinal
+                    (Modifiers.PUBLIC.toBridge(true), property.getReadMethodName(), desc, null);
+
+                if (mi != null) {
+                    CodeBuilder b = new CodeBuilder(mi);
+                    b.loadThis();
+                    b.invoke(property.getReadMethod());
+                    b.returnValue(desc);
+                }
+            }
+
+            if (property.getWriteMethod() != null &&
+                property.getWriteMethod().getParameterTypes()[0] != type)
+            {
+                // Not actually defined as a bridge method since parameter type differs.
+                MethodInfo mi = addMethodIfNotFinal
+                    (Modifiers.PUBLIC, property.getWriteMethodName(), null, new TypeDesc[] {desc});
+
+                if (mi != null) {
+                    CodeBuilder b = new CodeBuilder(mi);
+                    b.loadThis();
+                    b.loadLocal(b.getParameter(0));
+                    b.checkCast(TypeDesc.forClass(property.getType()));
+                    b.invoke(property.getWriteMethod());
+                    b.returnVoid();
+                }
+            }
+        }
+    }
+
     /**
      * Generates a copy properties method with several options to control its
      * behavior. Although eight combinations can be defined, only four are
-- 
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