1 files changed, 38 insertions, 0 deletions
diff --git a/Lib/java/various.i b/Lib/java/various.i
index 7ba7a5eb3..bfcf346d3 100644
--- a/Lib/java/various.i
+++ b/Lib/java/various.i
@@ -92,6 +92,7 @@
  * The returned string appears in the 1st element of the passed in Java String array.
  *
  * Example usage wrapping:
+ *   %apply char **STRING_OUT { char **string_out };
  *   void foo(char **string_out);
  *  
  * Java usage:
@@ -154,3 +155,40 @@
 /* Prevent default freearg typemap from being used */
 %typemap(freearg) char *BYTE ""
 
+/* 
+ * unsigned char *NIOBUFFER typemaps. 
+ * This is for mapping Java nio buffers to C char arrays.
+ * It is useful for performance critical code as it reduces the memory copy an marshaling overhead.
+ * Note: The Java buffer has to be allocated with allocateDirect.
+ *
+ * Example usage wrapping:
+ *   %apply unsigned char *NIOBUFFER { unsigned char *buf };
+ *   void foo(unsigned char *buf);
+ *  
+ * Java usage:
+ *   java.nio.ByteBuffer b = ByteBuffer.allocateDirect(20); 
+ *   modulename.foo(b);
+ */
+%typemap(jni) unsigned char *NIOBUFFER "jobject"  
+%typemap(jtype) unsigned char *NIOBUFFER "java.nio.ByteBuffer"  
+%typemap(jstype) unsigned char *NIOBUFFER "java.nio.ByteBuffer"  
+%typemap(javain,
+  pre="  assert $javainput.isDirect() : \"Buffer must be allocated direct.\";") unsigned char *NIOBUFFER "$javainput"
+%typemap(javaout) unsigned char *NIOBUFFER {  
+  return $jnicall;  
+}  
+%typemap(in) unsigned char *NIOBUFFER {  
+  $1 = (unsigned char *) JCALL1(GetDirectBufferAddress, jenv, $input); 
+  if ($1 == NULL) {  
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, "Unable to get address of a java.nio.ByteBuffer direct byte buffer. Buffer must be a direct buffer and not a non-direct buffer.");  
+  }  
+}  
+%typemap(memberin) unsigned char *NIOBUFFER {  
+  if ($input) {  
+    $1 = $input;  
+  } else {  
+    $1 = 0;  
+  }  
+}  
+%typemap(freearg) unsigned char *NIOBUFFER ""  
+