+ /**
+ * Open the input file that will be used through the support.
+ *
+ * @param source
+ * the source {@link URL}
+ *
+ * @return the {@link InputStream}
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ protected InputStream openInput(URL source) throws IOException {
+ return Instance.getCache().open(source, this, false);
+ }
+