# HG changeset patch
# User Michael Van De Vanter  <michael.van.de.vanter@oracle.com>
# Date 1404182045 25200
# Node ID 524f5cf6cb95ea1dea30ba8fd6c0246d6e7c72ee
# Parent  0e36e8377c99daf7aef420dedacebff81d86f836
Truffle/Source:  add a singleton null instance of SourceCallback

diff -r 0e36e8377c99 -r 524f5cf6cb95 graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/SourceCallback.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/SourceCallback.java	Mon Jun 30 21:22:39 2014 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/SourceCallback.java	Mon Jun 30 19:34:05 2014 -0700
@@ -34,4 +34,17 @@
     public void startLoading(Source source);
 
     public void endLoading(Source source);
+
+    /**
+     * Inert (singleton) implementation of {@link SourceCallback}.
+     */
+    SourceCallback NULL = new SourceCallback() {
+
+        public void startLoading(Source source) {
+        }
+
+        public void endLoading(Source source) {
+        }
+
+    };
 }