[Jython-checkins] SF.net SVN: jython:[6952] trunk/jython/src/org/python/core/PyFunction.java

[<th...@us...>]

Revision: 6952
          http://jython.svn.sourceforge.net/jython/?rev=6952&view=rev
Author:   thobes
Date:     2009-11-30 23:27:03 +0000 (Mon, 30 Nov 2009)

Log Message:
-----------
Added an initial implementation of automatic coercion of function objects to any single method interface.

Modified Paths:
--------------
    trunk/jython/src/org/python/core/PyFunction.java

Modified: trunk/jython/src/org/python/core/PyFunction.java
===================================================================
--- trunk/jython/src/org/python/core/PyFunction.java	2009-11-29 16:11:42 UTC (rev 6951)
+++ trunk/jython/src/org/python/core/PyFunction.java	2009-11-30 23:27:03 UTC (rev 6952)
@@ -1,6 +1,10 @@
 // Copyright (c) Corporation for National Research Initiatives
 package org.python.core;
 
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
 import org.python.expose.ExposedDelete;
 import org.python.expose.ExposedGet;
 import org.python.expose.ExposedMethod;
@@ -388,6 +392,24 @@
     public String toString() {
         return String.format("<function %s at %s>", __name__, Py.idstr(this));
     }
+    
+    @Override
+    public Object __tojava__(Class<?> c) {
+        // Automatically coerce to single method interfaces
+        if (c.isInterface() && c.getDeclaredMethods().length == 1) {
+            return Proxy.newProxyInstance(c.getClassLoader(), new Class[]{c}, new InvocationHandler() {
+                // XXX: not the most efficient implementation - the invocation handler could be shared
+                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+                    if (args == null || args.length == 0) {
+                        return __call__().__tojava__(method.getReturnType());
+                    } else {
+                        return __call__(Py.javas2pys(args)).__tojava__(method.getReturnType());
+                    }
+                }
+            });
+        }
+        return super.__tojava__( c );
+    }
 
     @Override
     public boolean isMappingType() { return false; }


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