Internal refactoring

Author: garydgregory

src/main/java/org/apache/commons/io/output/ProxyOutputStream.java

@@ -68,14 +68,19 @@ public Builder() {
          * @see #getOutputStream()
          * @see #getUnchecked()
          */
-        @SuppressWarnings("resource") // caller closes
         @Override
         public ProxyOutputStream get() throws IOException {
-            return new ProxyOutputStream(getOutputStream());
+            return new ProxyOutputStream(this);
         }
 
     }
 
+    @SuppressWarnings("resource") // caller closes
+    ProxyOutputStream(final Builder builder) throws IOException {
+        // the delegate is stored in a protected superclass variable named 'out'
+        super(builder.getOutputStream());
+    }
+
     /**
      * Constructs a new ProxyOutputStream.
      *