IO-122 - Helper classes for controlling closing of streams

    - Added a finalizer to AutoCloseInputStream

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@608744 13f79535-47bb-0310-9956-ffa450edef68

Author: jukka

src/java/org/apache/commons/io/input/AutoCloseInputStream.java

@@ -115,4 +115,14 @@ public int read(byte[] b, int off, int len) throws IOException {
         return n;
     }
 
+    /**
+     * Ensures that the stream is closed before it gets garbage-collected.
+     * As mentioned in {@link #close()}, this is a no-op if the stream has
+     * already been closed.
+     */
+    protected void finalize() throws Throwable {
+        close();
+        super.finalize();
+    }
+
 }