+ /**
+ * Return the list of authors, grouped by starting letter(s) if needed.
+ * <p>
+ * If the number of author is not too high, only one group with an empty
+ * name and all the authors will be returned.
+ * <p>
+ * If not, the authors will be separated into groups:
+ * <ul>
+ * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
+ * </li>
+ * <li><tt>0-9</tt>: any authors whose name starts with a number</li>
+ * <li><tt>A-C</tt> (for instance): any author whose name starts with
+ * <tt>A</tt>, <tt>B</tt> or <tt>C</tt></li>
+ * </ul>
+ * Note that the letters used in the groups can vary (except <tt>*</tt> and
+ * <tt>0-9</tt>, which may only be present or not).
+ *
+ * @return the authors' names, grouped by letter(s)
+ */
+ public List<Entry<String, List<String>>> getAuthorsGrouped() {
+ int MAX = 20;
+
+ List<Entry<String, List<String>>> groups = new ArrayList<Entry<String, List<String>>>();
+ List<String> authors = getAuthors();
+
+ if (authors.size() <= MAX) {
+ groups.add(new SimpleEntry<String, List<String>>("", authors));
+ return groups;
+ }
+
+ groups.add(new SimpleEntry<String, List<String>>("*", getAuthorsGroup(
+ authors, '*')));
+ groups.add(new SimpleEntry<String, List<String>>("0-9",
+ getAuthorsGroup(authors, '0')));
+
+ for (char car = 'A'; car <= 'Z'; car++) {
+ groups.add(new SimpleEntry<String, List<String>>(Character
+ .toString(car), getAuthorsGroup(authors, car)));
+ }
+
+ // do NOT collapse * and [0-9] with the rest
+ for (int i = 2; i + 1 < groups.size(); i++) {
+ Entry<String, List<String>> now = groups.get(i);
+ Entry<String, List<String>> next = groups.get(i + 1);
+ int currentTotal = now.getValue().size() + next.getValue().size();
+ if (currentTotal <= MAX) {
+ String key = now.getKey().charAt(0) + "-"
+ + next.getKey().charAt(next.getKey().length() - 1);
+ List<String> all = new ArrayList<String>();
+ all.addAll(now.getValue());
+ all.addAll(next.getValue());
+ groups.set(i, new SimpleEntry<String, List<String>>(key, all));
+ groups.remove(i + 1);
+ i--;
+ }
+ }
+
+ for (int i = 0; i < groups.size(); i++) {
+ if (groups.get(i).getValue().size() == 0) {
+ groups.remove(i);
+ i--;
+ }
+ }
+
+ return groups;
+ }
+
+ /**
+ * Get all the authors that start with the given character:
+ * <ul>
+ * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
+ * </li>
+ * <li><tt>0</tt>: any authors whose name starts with a number</li>
+ * <li><tt>A</tt> (any capital latin letter): any author whose name starts
+ * with <tt>A</tt></li>
+ * </ul>
+ *
+ * @param authors
+ * the full list of authors
+ * @param car
+ * the starting character, <tt>*</tt>, <tt>0</tt> or a capital
+ * letter
+ * @return the authors that fulfill the starting letter
+ */
+ private List<String> getAuthorsGroup(List<String> authors, char car) {
+ List<String> accepted = new ArrayList<String>();
+ for (String author : authors) {
+ char first = '*';
+ for (int i = 0; first == '*' && i < author.length(); i++) {
+ String san = StringUtils.sanitize(author, true, true);
+ char c = san.charAt(i);
+ if (c >= '0' && c <= '9') {
+ first = '0';
+ } else if (c >= 'a' && c <= 'z') {
+ first = (char) (c - 'a' + 'A');
+ } else if (c >= 'A' && c <= 'Z') {
+ first = c;
+ }
+ }
+
+ if (first == car) {
+ accepted.add(author);
+ }
+ }
+
+ return accepted;
+ }
+