From 446f9ff3333e65b5e06d0fdcf20f30bb1a1053b9 Mon Sep 17 00:00:00 2001
From: Matthew Jason Benson <mbenson@apache.org>
Date: Mon, 30 Jun 2008 17:51:35 +0000
Subject: [PATCH] add subclass hook

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@672840 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/tools/ant/types/resources/Resources.java  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/main/org/apache/tools/ant/types/resources/Resources.java b/src/main/org/apache/tools/ant/types/resources/Resources.java
index 16719f8ed..629dde4df 100644
--- a/src/main/org/apache/tools/ant/types/resources/Resources.java
+++ b/src/main/org/apache/tools/ant/types/resources/Resources.java
@@ -122,7 +122,7 @@ public class Resources extends DataType implements ResourceCollection {
             rc = new Vector();
         }
         rc.add(c);
-        FailFast.invalidate(this);
+        invalidateExistingIterators();
         coll = null;
         setChecked(false);
     }
@@ -215,6 +215,13 @@ public class Resources extends DataType implements ResourceCollection {
         }
     }
 
+    /**
+     * Allow subclasses to notify existing Iterators they have experienced concurrent modification.
+     */
+    protected void invalidateExistingIterators() {
+        FailFast.invalidate(this);
+    }
+
     /**
      * Resolves references, allowing any ResourceCollection.
      * @return the referenced ResourceCollection.