3 * Copyright (C) 2009 Didier Villevalois, Maciej Piechotka
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 * Didier 'Ptitjes' Villevalois <ptitjes@free.fr>
21 * Maciej Piechotka <uzytkownik2@gmail.com>
29 * Helpers for equal, hash and compare functions.
31 * With those functions, you can retrieve the equal, hash and compare
32 * functions that best match your element, key or value types. Supported
33 * types are (non-boxed) primitive, string and `Object` types.
35 * A special care is taken for classes inheriting from the
36 * {@link Comparable} interface. For such types, an appropriate compare
37 * function is returned that calls {@link Comparable.compare_to}.
43 * Get a equality testing function for a given type.
45 * @param t the type which to get an equality testing function for.
47 * @return the equality testing function corresponding to the given type.
49 public static EqualFunc get_equal_func_for (Type t) {
50 if (t == typeof (string)) {
58 * Get a hash function for a given type.
60 * @param t the type which to get the hash function for.
62 * @return the hash function corresponding to the given type.
64 public static HashFunc get_hash_func_for (Type t) {
65 if (t == typeof (string)) {
73 * Get a comparator function for a given type.
75 * @param t the type which to get a comparator function for.
77 * @return the comparator function corresponding to the given type.
79 public static CompareFunc get_compare_func_for (Type t) {
80 if (t == typeof (string)) {
81 return (CompareFunc) strcmp;
82 } else if (t.is_a (typeof (Comparable))) {
83 return (CompareFunc) comparable_compare;
85 return (CompareFunc) direct_compare;
90 internal static int comparable_compare (void* a, void* b) {
91 return ((Comparable) a).compare_to ((Comparable) b);
95 * Compares two arbitrary elements together.
97 * The comparison is done on pointers and not on values behind.
99 * @param _val1 the first value to compare.
100 * @param _val2 the second value to compare.
102 * @return a negative value if _val1 is lesser than _val2, a positive value
103 * if _val1 is greater then _val2 and zero if both are equal.
105 public static int direct_compare (void* _val1, void* _val2) {
106 long val1 = (long)_val1, val2 = (long)_val2;
109 } else if (val1 == val2) {