+ // PRIVATE METHODS
+ //
+
+ /**
+ * Generates an ID for this file. If a {@link #magnetUri} is set, an ID
+ * is {@link #extractId(String) extracted} from it. Otherwise the magnet
+ * URI is used. If the {@link #magnetUri} is not set, the
+ * {@link #downloadUri} is used. If that is not set either, the name of
+ * the file is returned.
+ *
+ * @return The generated ID
+ */
+ private String generateId() {
+ if (magnetUri != null) {
+ String id = extractId(magnetUri);
+ if (id != null) {
+ return id;
+ }
+ return magnetUri;
+ }
+ return (downloadUri != null) ? downloadUri : name;
+ }
+
+ //
+ // STATIC METHODS
+ //
+
+ /**
+ * Tries to extract the “exact target” of a magnet URI.
+ *
+ * @param magnetUri
+ * The magnet URI to extract the “xt” from
+ * @return The extracted ID, or {@code null} if no ID could be found
+ */
+ private static String extractId(String magnetUri) {
+ List<NameValuePair> parameters = URLEncodedUtils.parse(magnetUri.substring("magnet:?".length()), Charset.forName("UTF-8"));
+ for (NameValuePair parameter : parameters) {
+ if (parameter.getName().equals("xt")) {
+ return parameter.getValue();
+ }
+ }
+ return null;
+ }
+
+ //